Open Channel Flow Meter is used to continuously measure the volumetric flow of conductive liquid in open channels, culverts or Partially Filled Pipes.
Open Channel Flow Meter continuously measures fluid flow in open pipelines. Such as semi-pipe flow sewage pipes and large flow pipes without overflow weirs. Magnetic Open Channel or Partially Filled Pipe Flow Meter uses the flow rate-area method. The Open Channel Flow Meter measures the flow rate and level of the fluid in the pipeline. The user only needs to input the inner diameter of the round pipe or the width of the square pipe. The non-full pipe flowmeter will automatically calculate the flow rate. Open Channel Flow Meter can measure and display data such as instantaneous flow, velocity, and cumulative flow. Especially suitable for municipal rainwater, wastewater, sewage discharge and irrigation water pipelines.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
Features of Magnetic Partially Filled Pipe or Open Channel Flow Meter
Open Channel Flow Meter can be used for flow measurement of open partially filled pipes (round pipes, rectangular pipes or other special-shaped pipes).
Open Channel Flow Meter can be used for continuous measurement of municipal rainwater, wastewater, sewage discharge and irrigation water pipelines.
Open Channel Flow Meter can realize forward and reverse two-way flow measurement.
The sensor can work reliably for a long time under harsh scenes and sewage water quality.
The measuring range of flow velocity is 0.05-10m/s.
High flow measurement accuracy. Moreover, it is not affected by factors such as downstream, direct flow, obstruction, etc.
Large-screen, backlit LCD. The measurement data can be read clearly under strong light or at night.
The instrument display and output functions are complete. It can display data such as instantaneous flow, flow rate, cumulative flow, and has computer communication interfaces 232, 485 (optional).
With GSM and GPRS wireless data remote transmission function (optional).
With power failure timing, counting and clock functions.
Ultrasonic open channel flowmeter is used to measure the flow of fluid in the state of free surface of natural flow in a non-full tubular open channel, which is called open channel flow detection.
The measuring tank that is not full is called an open channel. The meter that measures the flow of fluid in the open channel is called an open channel flowmeter.
The ultrasonic open channel flowmeter is composed of three parts: an ultrasonic level gauge, a water measuring tank, and a flow totalizer.
Based on the flow rate-water level algorithm. Advanced flow rate measuring instrument and water level measuring instrument are adopted. A new type of intelligent flow system to ensure the accuracy of speed measurement and calculation. According to the width of the channel and the requirements of measurement accuracy. Adopted. The mathematical model of single probe method or multi-probe method for open channel flow measurement.
The automatic measurement of open channel flow usually adopts the weir level method or the velocity area method.
1. Water level method
The water level method is based on the shape of the open channel and the size of the water flow. A section of flow measuring weir trough is constructed on the open channel. The water level of the weir flow is monitored online. Then the hydraulic formula can be used to calculate the flow through the weir trough.
The flow velocity area method is a commonly used flow measurement method in open channels. There is no need to build water measuring structures. The flow rate is obtained by measuring the flow velocity and the area of the cross section.
Flow velocity area method Open channel flowmeter is a device for automatic measurement of open channel flow using velocity area method composed of flow indicator, flow meter and liquid level meter.
The flow meter can choose electromagnetic flowmeter or Doppler flow tester. If an electromagnetic flowmeter is selected, the flow rate indicator will convert the flow rate signal into a digital signal proportional to the flow rate signal, thereby realizing the flow rate measurement.
Sino-Inst is Open Channel Flow Meters suppliers, located in China. Open Channel Flow Meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of Open Channel Flow Meter respectively.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
High pressure flow meter is the first choice for flow measurement under extreme conditions. Such as high pressure and explosion-proof.
High pressure flow meter is produced by using proprietary technology and special process. Magnetic high pressure flow meter is composed of oil high pressure electromagnetic flow sensor and high pressure electromagnetic flow converter. It is specially used to measure the volume flow of conductive liquid or liquid-solid two-phase medium such as aqueous solution, mud, cement slurry, high-pressure water injection under high-pressure conditions. It can withstand up to 42MPa, and there are no obstructive moving parts in the pipe. There is almost no pressure loss. Straight pipes require more low.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
The high-pressure electromagnetic flowmeter is a flowmeter for measuring the volume flow of conductive liquid or solid-liquid two-phase medium such as mud, cement slurry, high-pressure water injection under high pressure conditions in geology, petroleum exploration, and oilfield systems. It meets the requirements that ordinary electromagnetic flow cannot reach. High pressure resistance requirements.
Application range: Conductive fluid flow in mining energy, steel, petroleum, chemical, electric power, industry, water conservancy, and other sectors. It can also measure acid, alkali, salt and other corrosive conductive liquids.
High Pressure Flow Meter – Turbine
The high-pressure turbine flowmeter adopts full hard alloy (tungsten carbide) shielded cantilever beam structure bearing. It integrates rotating bearing and pressure bearing. It greatly improves the life of the bearing. It can work in a small amount of mud and dirt.
The sensor of the high-pressure turbine flowmeter uses a stainless steel structure. The turbine adopts 2Cr13, which has good corrosion resistance. The use of ruby bearings and cemented carbide (LT6) bushings ensure the service life and long-term stability of the turbine sensor. Samarium-cobalt permanent magnet alloy is used as a signal detector, with strong output signal and good magnetic stability. It can work normally in 0-120℃ medium.
The flowmeter itself has a self-rectifying structure, which is small, light and simple in structure. It can be assembled and disassembled in a short time, which is quite convenient to install and use.
The principle of Coriolis mass flow meter mass measurement is Newton’s second law F=Ma. When the fluid flows in the vibrating tube, it will produce Coriolis force proportional to the mass flow. When there is no fluid flowing, the vibrating tube does not produce distortion. The signals detected by the electromagnetic signal detectors on both sides of the vibrating tube are in the same phase.
When fluid passes through, the vibrating tube is twisted under the action of a torque. There will be a phase difference between the two detectors. The transmitter measures the lag time between the left and right detection signals. This time difference is multiplied by the flow calibration coefficient to determine the mass flow.
The density measurement principle of Coriolis mass flowmeter is that the vibration frequency is inversely proportional to the square root of the fluid density, and the fluid density is determined by measuring the vibration frequency. Therefore, the mass flow meter can realize the measurement of fluid mass flow and the measurement of fluid density.
Sino-Inst is High Pressure Flow Meters suppliers, located in China. High Pressure Flow Meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of High Pressure Flow Meters respectively.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
A pipe Flow Meter is used to measure fluid flow in pipes or open channels. Magnetic Large Dia. Pipe Flow Meter is especially suitable for large diameter pipe measurement.
There are many types of Pipe Flow Meter. For example magnetic, ultrasonic, venturi, etc. A pipe Flow Meter is an induction meter that measures the volume flow of conductive media. Liquids are conductive or water-based. Not only can it be used for general process detection. It is also suitable for the measurement of mineral pulp, paper pulp, and pasty liquids. It can also be made into a plug-in electromagnetic flowmeter. It is widely used in the flow measurement and control of production processes such as water treatment and total control of environmental sewage.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
There are no flow obstructions in the measuring tube. No pressure loss, lower requirements for straight pipe sections;
Series nominal diameters are DN15～DN3800. There are many choices of sensor lining and electrode materials;
The converter adopts a novel excitation method. Low power consumption, stable zero point and high accuracy. The flow range can reach 1500:1;
The converter and the sensor can be integrated or separated;
The converter uses a 16-bit high-performance microprocessor. 2x16LCD display. Convenient parameter setting. Reliable programming;
The flowmeter is a two-way measuring system with three totalizers inside. Forward total, reverse total, and difference total. Can display positive and negative flow. And has a variety of outputs: current, pulse, digital communication, HART;
The converter uses surface mount technology (SMT). With self-check and self-diagnosis function
The measurement is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity;
Specifications of Magnetic Large Dia. Pipe Flow Meter
Caliber:
DN350-DN3800
Accuracy:
± 1.5% measured value standard ± 1.0% measured value special ± 0.5% measured value high precision
Conductivity :
5μs/cm
Measuring range :
Recommended use range: 0.5m/s～10m/s continuously adjustable Use range: 0.2m/s～15m/s continuously adjustable
Medium temperature:
-20- +150℃
Ambient temperature:
-20- +60℃
Fluid pressure:
≤ 1.6MPa
Protection level:
Sensor Converter IP67 IP67 IP68 IP67
Material quality:
The probe material is 304 stainless steel, the electrode material is 316 stainless steel, and the insulation layer is PTFE.
Electrical Interface :
M20×1.5,1/2〞NPT
Display method :
Standard two-line LCD display, which can display instantaneous and cumulative flow at the same time.
power supply:
220VAC 50HZ 24VDC
Explosion-proof grade:
Exd[ia]iam ll CT5
Signal output:
1. The switch value can be set as pulse output (1000HZ); High/low flow alarm; ATC alarm; Flow direction indication; error alarm; 2. Current output: 4-20mA output.
Configuration method:
1. Configure on-site through three manual keys. 2. On-site configuration via remote control. To 3. Perform on-site configuration through the handheld communicator. To Memory: EEPROM is a memory that will not disappear, without battery storage.
Large measuring range. The measurement is not affected by changes in temperature, density, pressure, viscosity, conductivity, etc.;
It can be installed and disassembled under continuous flow. It brings convenience to the user’s maintenance.
Compared with the general electromagnetic flowmeter, the manufacturing cost and installation cost are lower. Especially suitable for large and medium diameter pipeline flow measurement.
Pipe Flow Meter Types
Flow Metering Principals
Differential Pressure Flowmeters
Velocity Flowmeters
Positive Displacement Flowmeters
Mass Flowmeters
For Open Channel Flowmeters – weirs, flumes, submerged orifices, current meters, acoustic flow meters and more
The electromagnetic flowmeter is made according to Faraday’s law of electromagnetic induction. It is widely used in the flow measurement of various conductive liquids in industrial processes.
The main features of electromagnetic flowmeter are as follows:
There are no moving parts in the pipeline, no flow blocking parts, and almost no additional pressure loss during measurement.
The measurement results have nothing to do with physical parameters such as flow velocity distribution, fluid pressure, temperature, density, and viscosity.
High measurement accuracy and large measurement range (up to 200:1).
The straight pipe section has relatively low requirements and is easy to meet.
There are products with large diameter and meeting protection requirements.
The price of large-caliber products is higher, and the larger the caliber, the faster the price increase.
Ultrasonic flowmeters are made by using the original that the propagation speed of sound waves in a static fluid is different from the propagation speed in a flowing fluid. It can measure both conductive media and non-conductive media.
The main features of ultrasonic flowmeter are as follows:
The probe can be installed on the outside of the pipeline (outer clamp type). It does not hinder the flow of fluid in the pipeline to reduce pressure loss.
The measurement accuracy is related to the diameter of the pipe. The larger the pipe diameter, the higher the accuracy possible (multiple sound segments are used).
In occasions where the measurement accuracy is not high, insertion flowmeters can be used to measure large flows. Because the main advantage of the plug-in flowmeter is low price (only a fraction of other structures). And this kind of flowmeter is light in weight, small in pressure loss, and easy to install and maintain.
In occasions where the measurement accuracy is not high, insertion flowmeters can be used to measure large flows. Because the main advantage of the plug-in flowmeter is low price (only a fraction of other structures). And this kind of flowmeter is light in weight, small in pressure loss, and easy to install and maintain.
Common ones include insertion vortex flowmeter, insertion turbine flowmeter, insertion ultrasonic flowmeter, and insertion electromagnetic flowmeter.
The standard orifice flowmeter is a widely used flowmeter. The advantage of the standard orifice flowmeter is that it is simple to manufacture and can be used directly without real flow calibration.
One sensor measures the fluid temperature. The other sensor is a heating element to maintain a constant temperature difference higher than the fluid temperature. That is, the gas flow The heat is taken away when passing the heating element.
The heat taken away is proportional to the flow rate of the gas and the density of the gas. In order to maintain a fixed temperature difference between the two temperature sensors, the circuit needs to provide more power to the heating element. The output power in the circuit is related to the quality of the fluid, and thus the flow rate is measured.
The insertion vortex flowmeter is mainly used for the flow measurement of industrial pipeline medium fluid. Such as gas, liquid, vapor, and other media. The plug-in vortex flowmeter adopts a piezoelectric stress sensor with high reliability. It can work in the working temperature range of -20℃～+350℃. There are analog standard signals and digital pulse signal output.
One of the standard throttling parts of the standard venturi piping system. It is equipped with a differential pressure instrument to measure the volume flow of a single-phase stable fluid (liquid, gas, or vapor) in a closed pipeline.
Because of its simple structure and reliable work, it has been widely used in chemical, petroleum, light industry, medicine, fertilizer, metallurgical, and other industrial sectors.
In simple terms, there are two ways to measure the flow of pipelines. Change the pipeline or leave the pipeline unchanged.
(1) Cut off the pipeline first. Then install a flow meter. Calculate the flow rate in a certain period of time through the cross-section and the flow velocity. (2) Use non-contact sensors. Mount the sensor outside the clamp. Then measure the pipe flow.
A flow meter (or flow sensor) is an instrument used to measure the linear, nonlinear, mass, or volumetric flow rate of a liquid or a gas. When choosing flow meters, one should consider such intangible factors as familiarity of plant personnel, their experience with calibration and maintenance, spare parts availability, and mean time between failure history, etc., at the particular plant site. It is also recommended that the cost of the installation be computed only after taking these steps.
Flowmeter location: Flow meters are installed between the master valve and zone valves. To avoid false alerts, there should be no water taps or other uncontrolled water use on the downstream side of the flow meter.
Sino-Inst offers over 50 Pipe Flow Meters, at the Best Price.
A wide variety of Pipe Flow Meters options are available to you, such as free samples, paid samples.
About 13% of these are magnetic flow meters, 14% are Insertion Magnetic Flow Meter, 25% are Venturi flow meters, 13% are Handheld ultrasonic flow meters, and others are Liquid Turbine Flow Meters.
Sino-Inst is Pipe Flow Meters supplier, located in China. Sewage Flow Meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of Pipe Flow Meter respectively.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Battery Operated Flow Meter is mainly suitable for occasions where there is no external power supply, but self-powered.
Battery Operated Flow Meter is a lithium battery powered electromagnetic flow meter developed on the basis of electromagnetic flow meter. The battery-powered electromagnetic flowmeter uses a specially designed sensor excitation system and a high-performance lithium battery power supply system. Designed specifically for the water industry. Satisfy urban water supply to ensure accurate water fee calculation. It is widely used in the workplace without power supply. Such as: urban water supply, heating, sewage treatment, water administration and water resources, water conservancy projects and other industries.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
Self-diagnosis fault alarm and GSM/GPRS data wireless remote transmission function
Through the GSM/GPRS remote management software system, functions such as wireless remote transmission, storage and data analysis of flow data can be realized.
The meter adopts piecewise linear correction, so that it can ensure the accuracy requirements in the large, medium and small flow measurement.
Specifications of Magnetic Battery Operated Flow Meter
There is a component in the structure of electromagnetic flowmeter called “electrode”. Where is the function of this electrode?
Let’s start with its principle. The measurement principle of electromagnetic flowmeter is based on Faraday’s law of electromagnetic induction.
When a medium with a certain conductivity flows through the measuring tube, it will cut the magnetic line of force to generate a certain electromotive force. The electromotive force is detected by the electrode and transmitted to the converter through the cable. After the converter processes the electromotive force, the flow rate of the medium can be displayed. .
The role of the electrode is to detect the magnitude of the electromotive force.
The magnitude of the electromotive force is proportional to the magnetic flux intensity. The inner diameter of the measuring tube is proportional to the average flow velocity. The volume flow of the medium is linearly related to the induced electromotive force and the inner diameter of the measuring tube. It is inversely proportional to the magnetic induction intensity of the magnetic field and has nothing to do with other physical parameters.
The electrode is in direct contact with the measured medium. Therefore, the selection of electrode material is very important. Commonly used electrode materials are 316L stainless steel, Hastelloy, titanium, tantalum, platinum, etc. The material of the electrode can be selected according to the characteristics of the medium.
According to the situation of the wastewater treatment site, there are two general wastewater discharge methods. One is to discharge through pipes, and the other is to discharge through ditches. The two types of flow meters selected are therefore different.
1.Waste water is used for pipeline discharge, and most of them choose electromagnetic flowmeter to measure. Because there are no obstructions in the sensor, there is no fear of debris in the medium.
But need to pay attention to the medium must be full. If the pipe is not full, a pipe must be used to lead a section of the sinking pipe to ensure that the flowmeter is in a full pipe.
Note that the electromagnetic flowmeter cannot be installed at the drain of the pipeline, and the length of the straight pipe must meet the requirements of the flowmeter.
A measuring groove is installed at the discharge port, and an ultrasonic probe is installed directly above the groove. In this way, the flow of wastewater flowing through can be measured. This instrument generally uses 24V power supply, output: 4-20MA.
When selecting the electromagnetic flowmeter for waste water, it is necessary to know the temperature of the medium, the pressure of the medium, the flow range of the medium, the composition of the medium, the power supply requirements, and the on-site installation requirements. The key point of the selection is to choose which product to measure well. The second is to consider the convenience of installation, operation and maintenance. Finally, the product price can be considered.
Why is the price of some lithium battery electromagnetic flowmeters at USD 0. Some prices are higher.
Some manufacturers quote real prices, and some quote false prices. So many people will ask how much is a lithium battery electromagnetic flowmeter?
Electromagnetic flowmeters have different prices due to different diameters, different materials, different media, different linings, different meter heads, and different functions. The final quotation is based on the parameters.
Remarks: Because the lithium battery electromagnetic flowmeter is battery-powered, the price is different than other ordinary electromagnetic flowmeters. The final price should be based on the parameters.
The flowmeter is for measurement, mainly for measuring flow. Accuracy is the main parameter of the flowmeter.
The flow sensor is a signal output. Electrical signal, pulse signal, which is usually called analog output. It is for flow control.
Portable flow meters can also be called portable ultrasonic flow meters.
Generally, due to the requirements of some industrial sites, the on-site environment cannot be satisfied for the pipeline installation method, which is not only troublesome to install, but also has many after-sales problems. Therefore, in many occasions, customers will choose portable ultrasonic flowmeters. Its convenient installation has won a lot of favored by customers.
Portable ultrasonic flowmeters are relatively powerful. For example, some have functions such as data storage, direct printing, and online analysis of data. The handheld ultrasonic flowmeter generally only meets the flow measurement function. If additional data processing is required, it can be processed in the form of data line transmission.
The flow coefficient of the turbine flowmeter is the flow rate that represents the on-site working conditions. The flow coefficient is usually precisely related to the measurement accuracy of the instrument. This is also a very important item. The measurement accuracy level of the turbine flowmeter can be ±1% and ±0.5%.
Ordinary water meters do not need to install batteries. Those with display screens need to install batteries. Those who do not need manual meter reading may also need batteries.
If the water meter is an ordinary water meter, that is, a rotor-type water meter, there is no need to install batteries. This water meter is mainly composed of a casing, an impeller measuring mechanism, a deceleration mechanism, and an indicator meter. It has the characteristics of simple structure.
If the water meter is an IC card prepaid water meter, a battery needs to be installed. Since its data transmission and transaction settlement are carried out through the IC card, it is possible to realize the change from the staff’s door-to-door meter reading to the user’s own payment at the business office. IC card transactions The system also has the characteristics of convenient transaction and accurate calculation. It can use the bank for settlement.
Sino-Inst offer over 20 Magnetic Battery Operated Flow Meter, with Best Price. A wide variety of Magnetic Battery Operated Flow Meters options are available to you, such as free samples, paid samples.
Sino-Inst can customize the nominal diameter of DN3-DN3000. And Sino-Inst can be customized: waterproof electromagnetic flowmeter, battery-powered electromagnetic flowmeter, solar-powered electromagnetic flowmeter, thermal electromagnetic flowmeter, integrated split electromagnetic conversion, etc.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Stainless steel flow meter with stainless steel housing and stainless steel flange connection. Stainless steel flow meter can be used in harsh environment for corrosive fluids flow measurement.
Stainless steel flow meter is an electromagnetic flow meter made of stainless steel. It works based on Faraday’s law of electromagnetic induction. Used to measure the volume flow of conductive liquids with conductivity greater than 5μS/cm. Stainless steel flow meter is an induction meter that measures the volume flow of conductive media. It can measure the volume flow of general conductive liquids. It can also be used to measure the volume flow of strong corrosive liquids such as strong acids and alkalis and even liquid-solid two-phase suspension liquids such as mud, mineral pulp, and paper pulp.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
Flow measurement is not affected by changes in flow density, viscosity, temperature, pressure and conductivity. The sensor induced voltage signal has a linear relationship with the average flow rate. Therefore, the measurement accuracy is high
There is no obstruction in the measuring pipe, so there is no additional pressure loss. There are no movable parts in the measuring pipeline. So the sensor has a long life
The straight pipe section required by the sensor is short, which is convenient for installation
Only the inner lining and electrode of the sensor are in contact with the liquid to be measured. As long as the electrode and lining material are selected reasonably. Resistant to corrosion and wear
Two-way measurement system. The forward and reverse flow can be measured.
Applicable medium: any conductive liquid.
Specifications of Magnetic Stainless Steel Flow Meter
Converter form
Compact type
Split type
Executive standard
JB/T9248-1999
JB/T9248-1999
Accuracy class
Level 1 or 0.5
Level 1 or 0.5
Dielectric conductivity
＞5μs/cm
＞5μs/cm
Can measure the lowest flow rate
0.1 m/s
0.1 m/s
Can measure the highest flow rate
15m/s
15m/s
Turndown ratio
1:20, can be customized
1:20, can be customized
monitor
Standard
Standard
Signal output
Pulse or 4-20mA
Pulse or 4-20mA
Lining material
Rubber, PTFE
Rubber, PTFE
Electrode material lining
316 stainless steel, tantalum, titanium
316 stainless steel, tantalum, titanium
Power supply
220VAC or +24VDC
220VAC or +24VDC
Communication Interface
RS232, RS485
RS232, RS485
Protocol
MODBUS, HART, Profibus, etc.
MODBUS, HART, Profibus, etc.
Explosion-proof grade
Exd[ia]qIICT5
Exd[ia]qIICT5
Protection level
IP65, optional IP68
IP65, optional IP68
Instrument pass
DN6~DN2000
DN6~DN2000
Installation method
Flange installation, optional flange clamping
Flange installation, optional flange clamping
Nominal pressure
1.6MPa or customized
1.6MPa or customized
Medium temperature
＜180℃
＜180℃
Ambient temperature
-30℃-60℃
-30℃-60℃
Flow Meter for Measuring Corrosive Liquids
Stainless Steel Flow Meter is a kind of electromagnetic flow meter. It can be used to measure the flow of strong corrosive liquids such as acid, alkali and salt solution.
In the process of industrial consumption, many media are slightly or extremely corrosive. However, due to consumer demand, we also need to measure these media.
How to choose a suitable flow meter? How to choose a flow meter for measuring corrosive media?
1.Corrosion
Corrosion is a phenomenon in which metals are destroyed due to chemical effects in their environment. All metals and alloys can be corrosion resistant in certain specific environments.
But in other environments it is very sensitive to corrosion. Generally speaking, there are no industrial metal materials that are resistant to corrosion in all environments.
Corrosion can be divided into uniform corrosion (uniform corrosion) or general corrosion (general corrosion) and partial corrosion (localized corrosion).
The corrosion rate of general corrosion can be expressed in units such as mm/a. Usually, the data whose corrosion rate is below 0.1mm/a is converted to corrosion-resistant data. The corrosion rate is one order of magnitude larger than this, that is, the corrosion rate is 1mm/a.
Information about common equipment can sometimes be determined as applicable. Regarding the measuring element of the flow meter, it is not allowed. Based on the corrosion rate, the service life of the metal can be predicted.
2.Damage to the flowmeter caused by corrosive media
The corrosiveness of the medium is a serious threat to the flowmeter. Only certain types of flow meters such as clamp-on ultrasonic flow meters are less affected by corrosion.
a. Corrosive media will corrode the parts that are in direct contact with the flowmeter. Make it damaged and lose its function. For example, corrosion damage to the diaphragm of the differential pressure transmitter, and complete failure due to leakage of silicone oil. The electrode is corroded, causing the medium to be out of the world, causing the excitation coil to burn out.
b. The parts of the flowmeter are corroded by corrosive media for a long time and the geometric dimensions are changed. Cause the accuracy of the instrument to decrease. For example, after the rotor in the rotameter is corroded by the fluid, the outer dimension is reduced.
As a result, the flow indication is low. Another example is that the vortex generator in the vortex flowmeter is corroded by the fluid and the width is reduced. The appearance of the front flow surface becomes rough, causing changes in the flow coefficient.
There are also clamp-on ultrasonic flowmeters that are less affected by corrosive media. It is also often caused by the corrosion of he metal pipe by the medium. It weakens the transmitting and receiving signals, and loses flexibility in severe cases.
c. Shorten the life of the instrument. For example, the conical tube and other parts in the metal tube float flowmeter. After several years, the welds were worn out.
d. Leakage of corrosive media. If it is not discovered and disposed of in time, it will easily lead to safety and personal accidents.
According to long-term inspection, electromagnetic flowmeter and ultrasonic flowmeter are selected for common corrosive liquid measurement. If it is corrosive gas, you can choose acid-resistant stainless steel vortex flowmeter or other gas flowmeter.
The electromagnetic flowmeter for measuring liquid media can measure various corrosive media containing tiny particles. Of course, the premise is that the measured medium is conductive. It is only necessary to use different lining materials and electrode materials according to the corrosiveness of the medium to deal with the corrosion problem of the medium belt.
Ultrasound is even simpler. If you choose a clamp-on ultrasonic flowmeter, you don’t have to think about the corrosiveness of the medium at all. It’s just not as high as an electromagnetic flowmeter in measurement accuracy.
3.Measures for fluid corrosion in flow measurement
(1) Change the instrument regularly
Corrosive media can corrode metals in various conditions. Some corrosion rate is very fast, that is, full corrosion. Some corrosion is subtle, very slow, that is, partial corrosion. When making instrument selection, it should be analyzed in detail according to the detailed situation. Then make a decision.
For example, compressed air and water are generally considered to be non-corrosive, but they are not. Because the concentration of nitrogen and oxygen compounds in the atmosphere in urban areas is generally higher. When it is absorbed by the condensate in the compressed air. The condensate is acidic. Thereby it has slight corrosion to carbon steel materials.
This situation is more serious in plant areas such as sulfuric acid plants, nitric acid plants, and chlor-alkali plants. Of course, in addition to dilute nitric acid, sulfuric acid and hydrochloric acid may be contained in the compressed air at this time. The water situation is similar. Especially river water. Because it contains a variety of ions, it also corrodes carbon steel. Instruments used under this condition will show signs of corrosion after several years.
For example, it was found that the surface of the carbon steel ring chamber in contact with the fluid in the flow throttling installation was corroded. Become bumpy. In severe cases, the geometric size and appearance will change greatly. The inner walls of the front and rear straight pipe sections also become uneven. This situation does not meet the requirements of the verification procedures. It is difficult to guarantee the accuracy of the original instrument.
At this time, a problem arises. Is it possible to design and select the annular chamber and the front and rear straight pipe sections in the throttling installation to be changed to stainless steel?
Of course, if it is changed to stainless steel. The corrosion problem of the annular chamber and straight pipe section will certainly be solved, but at the same time the investment has increased. And the increase in investment is related to the pipe diameter. If the nominal diameter is larger. The increase in technology capital is not a small number.
Therefore, the decision-making should be based on the measurement accuracy request of the detailed measurement point, the severity level of corrosion, the life expectancy, and the budget acceptance ability. Weigh the pros and cons, and control responsively.
If the measurement accuracy is not high. Such as for process monitoring and control. Slightly corroded, carbon steel materials can also be used for many years. After the change to stainless steel, the investment increased more. Then, it’s better to wait for the ring chamber to be corroded and unable to continue to be used. Then update the entire or damaged part of the throttling installation.
(2) Avoid the heavy
Avoiding the heavy and the light is based on a deep understanding of the process flow and the characteristics of the relevant media. Choose a measurement plan reasonably. It can also achieve the purpose of metering or stopping control of the consumption process. Avoid highly corrosive parts. And choose the less corrosive part. Even change the variety of adjusted parameters.
For example, the flow rate constant value adjustment system can be replaced by liquid level average adjustment or other suitable variable adjustment. So as to avoid the problem of corrosion resistance of flow measuring instruments.
For example, the flow of sewage into sewage treatment plants must be measured. In order to control the total discharge of pollutants. The sewage is generally acidic or alkaline. And correspondingly, an appropriate amount of alkali or acid should be added to neutralize it. Then, consider the corrosion of sewage to the flow meter. Of course, it is better to select the flow detection point after neutralization.
The flow measurement of raw gas also has a similar situation. Raw gas often contains a certain amount of sulfur dioxide. This gas is not very corrosive in boring hours. But after the wild gas is separated from the furnace. With the increase of the transfer interval. The gas temperature gradually decreases. The temperature rises accordingly. And it quickly shows condensate and is highly corrosive. When considering the location of the gas flow measuring instrument device. Of course, it should be selected before the gas presents condensate.
(3) Choose an instrument with corrosion resistance
①The instrument selection of common acid medium.
In the vortex flow sensor and turbine flow sensor, the part in contact with the fluid is acid-resistant steel. Ordinary acidic liquids and gases can be used. The oval gear flowmeter made of acid-resistant steel can meet the needs of accurate measurement of ordinary acid liquids.
②The instrument selection of conductive liquid.
There are many kinds of lining materials for measuring tube of electromagnetic flowmeter.
Among them, the good corrosion resistance is polytetrafluoroethylene. There are also several kinds of electrode materials, which can meet the needs of most corrosive media.
When selecting electrode materials, the requirements should be met. Don’t be superstitious about precious metals. Because precious metals are not omnipotent.
Other catalysts like platinum electrodes have also attracted people’s attention. In chemical consumption, platinum is a very good catalyst. Certain media react chemically after contact with platinum under certain conditions. Proven hydrogen peroxide. The platinum electrode electromagnetic flowmeter is measuring hydrogen peroxide. Aerosol will be generated on the surface of the electrode. When the flow is zero. The output will also fluctuate.
Select appropriate electrode materials and lining materials to measure the flow of corrosive media. If the fluid temperature is also within the allowable range. That is the ideal choice, its measurement accuracy can reach 0.3~1%R.
Magnetic flowmeter can meet the needs of various measurement ranges. But if the fluid does not conduct electricity, the electromagnetic flowmeter is powerless.
③The instrument selection of non-conductive liquid.
When the clamp-on ultrasonic flowmeter works, the fluid does not directly contact the meter. Therefore, it is suitable for various corrosive fluids.
There are two types of clamp-on ultrasonic flowmeters according to their principles. Jet lag and Doppler.
The time difference method is suitable for clean single-phase fluids. The accuracy is related to pipe diameter and flow rate. E.g: a. When pipe diameter>150mm, v>0.3m/s, the uncertainty is ±2%R (it can reach ±1% R after calibration). v ≤0.3m/s, the uncertainty is ±O.Olm/s. b. When the pipe diameter is ≤150mm, v>0.3m/s, the uncertainty is ±5%. v≤0.3m/s, the uncertainty is ±0.05m/s.
The Doppler flowmeter is suitable for liquids with high solid content or bubbles. The uncertainty can only reach ±1%~±10%. Obviously much lower than the electromagnetic flowmeter. Therefore, use it only when there is no other better method. The price has nothing to do with the pipe diameter. When DN≤200, ultrasonic meters are more expensive than electromagnetic flowmeters. When DN≥250, the ultrasonic flowmeter is cheaper than the electromagnetic flowmeter.
④ Selection of corrosive gas instruments
a. Ultrasonic flow meter.
In recent years, the domestic and foreign natural gas industry has achieved rapid development. This has greatly promoted the development of natural gas metering instruments. Among them, the multi-channel ultrasonic flowmeter specially developed for natural gas measurement is a dazzling pearl. If this technology is transplanted for corrosive gas flow measurement, it should be feasible. Because only the inner wall of the measuring tube needs to be treated for corrosion prevention.
b. Throttle differential pressure flowmeter.
There are no reports of commercial throttling differential pressure flow meters suitable for corrosive media. However, such meters developed by users themselves were reported decades ago.
Sino-Inst offers over 10 Magnetic Stainless Steel Flow Meter for flow measurement. About 50% of these are wastewater flow meters, 40% is the liquid flow sensor. And 20% are Ultrasonic Flow Transmitter and mass flow meter.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Sanitary Flow Meter adopts stainless steel tri clamp fittings. Used in food, sport drink, liquor and other beverage industries preprocess applications.
Sanitary Flow Meter uses a new type of sanitary lining material and lining technology, which meets the sanitary requirements of the food industry. It uses a stainless steel shell and stainless steel clamp connection. It is convenient for the quick disassembly and cleaning of the electromagnetic flow meter. Magnetic flow meter in a sanitary version which meets the strict requirements of the food-processing and bio-technology/ pharmaceutical industries.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
The sensor adopts new sanitary lining material. Prevent the accumulation of measuring medium residues in the measuring tube.
The sensor adopts a quick connection scheme. The electromagnetic flowmeter is easy to disassemble, maintain and clean.
The converter uses a 16-bit embedded microprocessor for signal processing. It has high integration and fast calculation speed. The calculation accuracy is high. Fully digital signal processing. Strong anti-interference ability. Features such as reliable measurement.
The intelligent converter can simultaneously display measurement data such as volume flow percentage, instantaneous flow, and cumulative flow.
The flowmeter is a two-way measuring system with three totalizers inside. Forward total, reverse total, and difference total. It can display positive and negative flow.
With digital communication signal output such as current, pulse, RS485, RS232, Hart and Modbus.
Application of Hygienic Electromagnetic Flowmeter in Beer Industry
Magnetic Sanitary Flow Meter uses a new sanitary lining material and lining process. Meet the hygiene requirements of the food industry. At the same time, a stainless steel casing and a stainless steel clamp connection are used to facilitate the rapid disassembly and cleaning of the electromagnetic flowmeter.
The electromagnetic flowmeter is not easily contaminated during use. It can be widely used in the production process of mineral water, soy sauce, jam, fruit juice, rice wine, milk, and other foods, as well as in the fields of hygiene and chemical industry. Especially it is most widely used in beer filling.
Magnetic Sanitary Flow Meter is used in the beer filling production line to perform quantitative filling while filling. An electronic valve filling machine equipped with a sanitary electromagnetic induction flowmeter is adopted, which is a dynamic measurement and quantitative form. The electromagnetic flowmeter is used for dynamic measurement of the liquid flowing through the valve.
A Sanitary electromagnetic flowmeter plays an important role in the measurement process of beer brewing. Not only because it has the advantages of low failure rate and high measurement accuracy. Also due to its Faraday electromagnetic induction principle. That is, the conductor will generate induced electromotive force when passing through the magnetic field. The flowing liquid medium represents a moving conductor, and the induced current is proportional to the flow speed. Input the metering amplifier through a pair of electrodes. Through the calculation of the fluid cross-sectional area and flow rate. The flow rate can be accurately obtained, and the quantitative accuracy can reach 1/1000.
Note: The caliber of the selected sanitary electromagnetic flowmeter is not necessarily the same as the pipe diameter, it should be determined by the flow rate. The process industry transports liquids with different viscosities such as water. The pipeline velocity is generally 1.5～3m/s. EMF is used on such pipelines, and the sensor diameter is the same as the pipe diameter.
Application of Magnetic Sanitary Flow Meter in measuring beverages such as milk and juice
Milk is a liquid food, similar to this, there are juices, beverages, etc. For the measurement of such media, the level of hygienic requirements is of course the first.
In our sales process, we often encounter some telephone consultations Choose the flowmeter in the milk pipeline configuration. The related flowmeter products produced by our company can also meet its measurement requirements.
The following is a corresponding explanation of the selection of measuring instruments for such food liquid media.
Question: Should I choose a sanitary liquid turbine flowmeter or a sanitary electromagnetic flowmeter? Or is there a more advanced, better and more suitable flow meter?
Answer: First of all, milk (liquid) conducts electricity (there are various conductive ions in it). There are many kinds of mineral ions in milk, so both flow meters can be used.
Advantages: (1) High precision, among all flow meters, it is the most accurate flow meter; (2) Good repeatability; (3) Zero drift, good anti-interference ability; (4) Wide range; (5) Compact structure. Disadvantages: (1) The calibration characteristics cannot be maintained for a long time; (2) Fluid physical properties have a greater impact on flow characteristics.
Tri-Clamp sanitary magnetic flowmeter
Advantages: (1) The measurement channel is a smooth straight pipe, which will not be blocked. It is suitable for measuring liquid-solid two-phase fluids containing solid particles, such as pulp, mud, sewage, etc.; (2) No pressure loss caused by flow detection, and good energy saving effect; (3) The measured volume flow is actually not significantly affected by changes in fluid density, viscosity, temperature, pressure and conductivity; (4) Large flow range and wide caliber range; (5) Corrosive fluids can be used. Disadvantages: (1) Liquids with very low conductivity cannot be measured, such as petroleum products; (2) Cannot measure gas, steam and liquid with larger bubbles;
Large-caliber instruments are mostly used in water supply and drainage projects.
Small and medium calibers are often used in high-demand or difficult-to-test occasions, such as the cooling water control of the blast furnace tuyere in the iron and steel industry, the measurement of pulp and black liquor in the paper industry, the strong corrosive liquid in the chemical industry, and the ore pulp in the non-ferrous metallurgical industry.
Small calibers and tiny calibers are often used in places with hygiene requirements such as the pharmaceutical industry, food industry, and biochemistry.
Summary:
The flowmeter in the milk pipeline configuration can be selected according to the on-site working conditions and flow range. No flowmeter is the best, only choose the appropriate flowmeter according to the actual situation on the spot. It is handy during use. It is a perfect flow meter.
Sanitary Flow Meter, also called sanitary turbine flow meter or Hygienic turbine flowmeter.
The Sino-Instrument sanitary turbine flow meter, food grade flow meter, provides accuracy, versatility, and economy, in measuring a wide variety of food, beverage and pharmaceutical products.
The Sino-Inst sanitary turbine and is suitable, for use in clean-out-of-place (COP) and sterilize-out-of-place (SOP) environments.
Sino-Inst is Sanitary Flow Meters supplier, located in China. Sanitary Flow Meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of ultrasonic level transmitters respectively.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Sewage Flow Meter is an electromagnetic flow meter used to measure sewage/waste water. Also called Effluent flow meter, or wastewater flow meter.
Sewage Flow Meter application for water flow rate measurement, in those wastewater treatment industrial pipes. The water and sewage treatment industry plays an important role in providing high-quality water supply. In the water treatment process, no matter it is water inlet, transportation, drainage and other processes, the flow needs to be measured. Therefore, the choice of flowmeter is particularly important.
Sewage has the characteristics of large flow rate changes, impurities, high corrosiveness, and certain conductivity. Electromagnetic flowmeter has the advantages of wide range, simple structure, no moving parts, and can measure dirty and corrosive media. Therefore, in the sewage treatment industry, electromagnetic flowmeters are widely used. Here you can find the right sewage flow meter to measure the flow of wastewater for your application.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
Electromagnetic flowmeter is an instrument for measuring volumetric flow. Flow measurement is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. The sensor induced voltage signal has a linear relationship with the average flow rate, and the measurement accuracy is high.
There are no obstructions and moving parts in the measuring tube, which will not cause additional energy loss or blockage. Therefore, the energy-saving effect is significant, and it is especially suitable for the measurement of liquid-solid two-phase flow such as sewage, mud, mineral pulp, coal water slurry, paper pulp, etc.
The electromagnetic flowmeter has no mechanical inertia and is sensitive. It can measure instantaneous pulsating flow and has good linearity.
Installation requirements are low. The straight pipe section required by the sensor is relatively short, generally the first 5D and the rear 3D (D is the inner diameter of the selected instrument).
The sensor part only has the lining and the electrode in contact with the medium. As long as the electrode and the lining material are selected reasonably, it can resist corrosion and abrasion, ensuring long-term use.
When the power is off, the EEPROM can protect the set parameters and accumulated values.
The converter uses a low-power single-chip microcomputer to process data. It uses SMD electronic components and surface mount SMT technology. Reliable performance, high precision, low power consumption, and zero point stability. LCD display, display cumulative flow, instantaneous flow, flow rate, flow percentage and other parameters.
It adopts multi-electrode structure with high accuracy. Equipped with ground electrode, no grounding ring is needed, which saves cost.
The low-frequency rectangular wave excitation improves the stability of the flow. The power loss is low and the low flow rate is superior.
Two-way measurement system. It can measure forward flow and reverse flow.
Specifications of Remote Magnetic Sewage Flow Meter
According to the situation of the wastewater treatment site, there are two general wastewater discharge methods. One is to discharge through pipes, and the other is to discharge through ditches. The two types of flow meters selected are therefore different.
1.Waste water is used for pipeline discharge, and most of them choose electromagnetic flowmeter to measure. Because there are no obstructions in the sensor, there is no fear of debris in the medium.
But need to pay attention to the medium must be full. If the pipe is not full, a pipe must be used to lead a section of the sinking pipe to ensure that the flowmeter is in a full pipe.
Note that the electromagnetic flowmeter cannot be installed at the drain of the pipeline, and the length of the straight pipe must meet the requirements of the flowmeter.
A measuring groove is installed at the discharge port, and an ultrasonic probe is installed directly above the groove. In this way, the flow of wastewater flowing through can be measured. This instrument generally uses 24V power supply, output: 4-20MA.
When selecting the electromagnetic flowmeter for waste water, it is necessary to know the temperature of the medium, the pressure of the medium, the flow range of the medium, the composition of the medium, the power supply requirements, and the on-site installation requirements. The key point of the selection is to choose which product to measure well. The second is to consider the convenience of installation, operation and maintenance. Finally, the product price can be considered.
A flow meter’s deviation from the standard can be measured in two ways: with a master meter or by weighing mass flow.
Master meters are calibrated to peak accuracy by specified, accredited laboratories.
These labs are ones that are certified by the National Institute of Standards and Technology (NIST). Subsequently, this means that flow meters. Which are calibrated to master meter accuracy in such a lab will be backed by NIST certification and traceability.
The second method of flow meter calibration involves weighing the amount of fluid that flows through the meter, during the calibration procedure. This is typically done using a supremely accurate weigh scale, which must also be approved by NIST.
This method is often regarded as the most accurate way to measure the volume of flow.
However, this method is frequently scrutinized because it lacks the involvement of national standards.
Additionally, field calibrations are usually not an option in most applications. Because challenging an installed flowmeter with a given volume of water is just not practical.
Sino-Inst is Sewage Flow Meters suppliers, located in China. Sewage Flow Meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of ultrasonic level transmitter respectively.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Insertion Magnetic Flow Meter, also called insertion electromagnetic flow meter, is an insertion type flow meter.Insertion magnetic flowmeter can be installed without stopping the flow. Suitable for large diameter DN300-3000.
Insertion Magnetic Flow Meter adopts pressure tapping and installation technology. Insertion electromagnetic flow meter is composed of insertion electromagnetic sensor and electromagnetic flow converter.
Installation can be divided into an online installation type of the cut-off valve, and water control installation type without stop valves. The Insertion Magnetic Flow Meter is suitable for measuring the volume flow of various conductive liquids in the pipeline. It can also be used to measure corrosive conductive liquids such as acid, alkali and salt.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
Compared with the pipe segment electromagnetic flowmeter, the advantages of Insertion Magnetic Flow Meter:
No need to cut off the water, cut off the pipeline, install directly on the old pipeline;
Easy to disassemble during maintenance;
Especially suitable for large-diameter pipelines, with high cost performance;
The accuracy is lower than the flange type, and it is mostly used for process control rather than measurement;
It can be made into one-piece or component pose;
The Insertion electromagnetic structure can be easily installed and disassembled without stopping the water under low pressure or under pressure. Therefore, it is very suitable for the fluid measurement of existing pipelines and facilitates the maintenance and repair of instruments.
The measurement accuracy is not affected by changes in physical parameters such as the temperature, pressure, density, viscosity, conductivity (as long as the conductivity is greater than 20μs/cm) of the measured medium.
The sensor has almost no pressure loss and extremely low energy loss.
Large flow measurement range. The full-scale flow rate in the measured pipe can be set arbitrarily from 1m/s to 10m/s, and the output signal has a linear relationship with the flow rate.
The flowmeter not only has 0~10mA or 4~20mA standard current output, but also 1~5kHz frequency output
Specifications of insertion electromagnetic flowmeter
All MAG Meters operate under the same fundamental principle of classical physics (Faraday’s Law of Electromagnetic Induction):
E = CONSTANT x B x D x V
The law states that the magnitude of the voltage (E) induced in a conductive medium, moving through a magnetic field is directly proportional to the strength of the magnetic field (B), the path length between the probes (D), and the velocity of the medium (V).
In principle and implementation, it is possible to fix all parameters except velocity.
Thus a MAG Meter responds only to “velocity” and is extremely insensitive to changes in fluid conditions (density, viscosity, etc.) and application constraints (pressure, temperature, and mechanical vibrations, as well as fluid pulsation).
The operation of a MAG Meter is completely analogous to an electrical generator.
A voltage is induced in a conductor that is moving at right angles through a magnetic field.
The faster the conductor moves, the more voltage is generated.
It should be installed at the lower part of the horizontal pipeline and vertically upwards, avoid installing at the highest point of the pipeline and vertically downwards;
It should be installed on the rising part of the pipeline;
Installation in the open discharge pipe should be installed at the lower part of the pipe;
If the pipeline drop exceeds 5m, install an exhaust valve downstream of the sensor;
The control valve and shut-off valve should be installed downstream of the sensor, not upstream of the sensor;
The sensor must not be installed at the inlet and outlet of the pump, it should be installed at the outlet of the pump.
Keep away from equipment with strong fields, such as large motors and large transformers.
There should be no strong vibration in the installation place, and the pipeline should be firmly fixed. The ambient temperature should not change much.
The installation environment should be easy to install and maintain.
Choice of installation location
The installation location must ensure that the pipeline is always filled with the fluid under test. Choose a place where the fluid flow pulse is small, that is, away from the pump, valves, elbows and other local resistance parts.
When measuring two-phase (solid, liquid or gas, liquid) fluids, choose a place that is not easy to cause phase separation.
Avoid negative pressure at the measurement site.
The diameter or circumference of the side pipe is easy to measure, and the ovality should be small.
Length of straight pipe
The length of the straight pipe section on the upstream side of the sensor installation pipeline should be greater than or equal to 10D, and the downstream side should be no less than 5D (D is the diameter of the pipeline being tested).
The flow control valve should be installed on the pipe under test on the upstream side of the sensor, and the flow control valve should be installed on the downstream side of the sensor. When measuring, usually the flow control valve should be fully open.
Installation method
Vertical installation, when the sensor is inserted into the pipeline, it should be perpendicular to the central axis of the pipeline, and the included angle with the pipe section is less than 50. It is suitable for measuring clean media with small pipeline vibration.
There are two ways to insert the insertion point of the electromagnetic flow sensor. One is to insert at 1/4 of the inner diameter of the pipe. The other is to insert at 1/2 of the inner diameter of the pipe.
Correctly weld the mounting base to the pipe. Clean up welding slag and burrs on the mounting base of the pipe under test.
Turn off the upstream flow control valve or use a low-pressure water supply.
Install the DN50 ball valve on the mounting base. Note that the long cavity of the ball valve faces upwards. Check whether the ball valve can be fully opened and closed. If there is any problem, repair it. Install the compression threaded seat, compression nut and rubber sealing ring on the ball valve. Loosen the positioning screw and the compression nut, and insert the sensor through the ball valve into the pipe under test. Tighten the compression nut and the positioning screw, and at the same time, pay attention to the insertion direction of the sensor direction sign and the fluid flow direction.
Insertion depth
(1) When selecting the electrode to insert to the average flow rate, the average flow rate point is about H=0.25D from the pipe wall (D: pipe inner diameter) according to the pipeline turbulent flow conditions. Press the handle to make the insertion rod enter the pipe H deep. (L2 at this time = original L2-H)
(2) After confirming that the insertion depth is correct, turn the flow direction rod to make its connection parallel to the centerline of the pipeline. At this time, the connection between the two electrodes will be perpendicular to the centerline of the pipeline. That is, the connection between the electrodes is perpendicular to the flow rate.
(3) After adjustment, first tighten the lock nut firmly, and then tighten the three locknuts separately. One of their functions is to ensure that the insertion rod is not pushed out by the pressure in the tube. The other is to ensure that the insertion rod does not vibrate.
(4) During actual on-site installation, the insertion depth is only allowed to be 0.25D, which is a quarter of the diameter of the pipe. The insertion depth is 0.5D, which is the center of the pipe.
(5) Loosen the fastening screws under the junction box. Rotate the junction box to the position you are satisfied with and tighten the nuts.
The Insertion flowmeter is a type of flowmeter divided by structure. It includes various flowmeters with different working principles.
Usually, the flowmeter and the pipeline are flanged. Only when the processing pipeline is cut off is allowed to be disassembled, repaired, and replaced. This has a great impact on the reliable operation of the system. The Insertion flowmeter fundamentally solves this defect. Although the measurement accuracy is slightly lower. But on some large-caliber occasions, Insertion flowmeters have been used to measure the total amount of fluid.
There are many forms of Insertion flowmeters that have been promoted. According to the working principle of Insertion flowmeter detection heads, they can be divided into Insertion turbine, Insertion vortex, Insertion electromagnetic, uniform velocity tube, and thermal flowmeter. The number of measuring points of the Insertion flowmeter can be divided into two categories: point flow type and runoff type.
The accuracy of the magnetic flowmeter has been calibrated by the calibration line when it leaves the factory. However, at the use site, due to environmental conditions, fluid characteristics, and instrument damage such as component damage. It often causes instrument operation failures. Therefore, the electromagnetic flowmeter needs calibration. Ensuring accurate flow meter performance is an inestimable part of business planning and costing.
More Featured Insertion flowmeters
At present, there are many kinds of Insertion flowmeters in use. According to the working principle of the Insertion flowmeter detection head, it can be divided into Insertion turbine, Insertion vortex, Insertion electromagnetic, Insertion ultrasonic, and Insertion target flowmeter.
The correct choice of the flowmeter is of great significance for flow measurement. Choosing different flow meters under the same working conditions will definitely have a considerable difference in the final measurement results.
If the initial selection is improper, it may even lead to the inability to perform quantitative measurements and cause damage to the instrument. Therefore, it is necessary for users to have a correct understanding of how to choose a suitable flow meter. Knowing some basic selection methods will help make mistakes when choosing meters.
In order to ensure the use of the flow meter in the production site process. The choice of flowmeter, in general, must be determined according to the medium that needs to be measured at the production site.
The advantages of the insertion vortex flowmeter are particularly good anti-vibration performance, no zero drift, and high reliability. Through a large number of waveform analyses and frequency spectrum analyses on the vortex flowmeter for a long time, the probe shape, wall thickness, height, probe rod diameter, and matching piezoelectric crystals are designed.
It adopts an advanced numerical control lathe for processing. It ensures the coaxiality and smoothness of processing and other technical parameters and cooperates with special processing. It overcomes the common problem of the influence of the inherent self-oscillation frequency of the vortex flowmeter on the signal.
The insertion vortex flowmeter is mainly used for the flow measurement of large-caliber gas, liquid, and steam medium fluids in industrial pipelines in various industries.
It is characterized by small pressure loss, a large measuring range, and high accuracy. It is almost not affected by fluid density, pressure, temperature, viscosity, and other parameters when measuring volume flow under working conditions.
Insertion ultrasonic flowmeter can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam shift method, Doppler method, and cross-correlation method according to the principle of signal detection. , Spatial filtering method and noise method, etc.
Ultrasonic flowmeters are the same as electromagnetic flowmeters. Because the flow channel of the instrument is not equipped with any obstructions, it is an unobstructed flowmeter. It is a type of flowmeter suitable for solving difficult problems in flow measurement. Especially in large-caliber flow measurement. The advantages.
Insertion ultrasonic flowmeter is mainly used in petroleum, chemical industry, metallurgy, electric power, water supply, and drainage, and other fields.
The structure of the Insertion turbine flowmeter is an explosion-proof design. It can display the total flow, instantaneous flow, and the percentage of flow full scale. The battery adopts a long-term lithium battery. The battery life of a single-function integrator can reach more than 5 years, and the battery life of a multi-function indicator can reach more than 12 months.
Turbine Insertion Flow Meter
Insertion turbine flowmeter can display many flow units, including cubic meters, gallons, liters, standard cubic meters, standard liters, etc. The fixed pressure and temperature parameters can be set to compensate for the gas. For occasions where the pressure and temperature parameters do not change much, the instrument can be used for fixed compensation accumulation.
Insertion turbine flowmeters are mainly used in metering and control systems in the fields of petroleum, chemical industry, metallurgy, scientific research, and so on.
The Insertion target flowmeter is based on the traditional target flowmeter. With the development of new sensors and microelectronics technology, a new type of capacitive force induction flow Insertion target flowmeter has been developed. It has the characteristics that the flowmeter has no movable parts such as an orifice plate and vortex street. At the same time, it has high sensitivity and accuracy comparable to positive displacement flow meters. The measuring range is wide.
Target Flow Meter
Insertion target flowmeter has good adaptability in the working conditions of small flow, high viscosity, easy to condense and easy to block, high and low temperature, strong corrosion, strong vibration and other flow measurement difficulties. Mainly used for flow measurement in various fields such as metallurgy, petroleum, chemical industry, energy, food, and environmental protection.
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Sino-Inst offers 10 Insertion Magnetic Flow Meters. A wide variety of Industrial flow meters options are available to you. such as free samples, paid samples.
Sino-Inst is an Industrial flow Transmitter supplier, located in China. The top applying countries are China (Mainland), Hong Kong, and the United States, which supply 96%, 2%, and 1% of wireless pressure transmitters respectively.
Insertion Magnetic Flow Meter products are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.
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Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Magnetic Water Flow Meter is an electromagnetic flowmeter used to measure conductive fluids. Conductive liquids such as drinking water, sewage, wastewater, seawater, ammonia, cement slurry, etc.
Magnetic Water Flow Meter provide highly accurate flow measurement for a wide variety of conductive fluid applications. Magnetic Water Flow Meter is a volumetric flow meter that measures liquids or liquid slurries that have a minimum conductivity of 5 µS/cm. Based on Faraday’s law of electromagnetic induction. Magnetic Water Flow Meter is ideal for wastewater applications or any dirty liquid which is conductive or water based. It is widely used in water treatment, environmental protection sewage measurement and control, papermaking and other industrial and agricultural production processes for flow measurement and control.
Sino-Inst offers a variety of Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.
Not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. The linear measurement principle can achieve high-precision measurement;
There are no flow blocking parts in the measuring pipe. The pressure loss is small, and the requirements for straight pipe sections are low;
Nominal diameter DN6-DN3000 covers a wide range. There are many choices of lining and electrodes. It can meet the requirements of measuring a variety of conductive fluids;
The converter adopts programmable frequency low frequency rectangular wave excitation. It improves the stability of flow measurement and has low power loss;
The converter adopts 16-bit embedded microprocessor. Full digital processing, fast calculation speed. Strong anti-interference ability, reliable measurement. High accuracy, flow measurement range up to 1500:1;
High-definition backlit LCD display. Easy to use, simple to operate, easy to learn and understand;
With RS485 or RS232 digital communication signal output;
With conductivity measurement function, it can judge whether the sensor is empty or not. With self-check and self-diagnosis function;
Adopt SMD devices and surface mount (SMT) technology. High circuit reliability;
Can be used in corresponding explosion-proof occasions.
KLD electromagnetic water flowmeter can be used to measure the volume flow of conductive fluid in a closed pipeline. It is widely applied in the flow measurement and control in the fields of chemical and petroleum industry, metallurgy industry, water and wastewater, agriculture and irrigation, paper making, food and beverage industry and pharmaceutical industry.
The premise of using Magnetic Water Flow Meter is that the measured liquid must be conductive. The conductivity of the liquid cannot be lower than the threshold, the lower limit. If the conductivity is lower than the threshold, it will cause measurement error until it can not be used.
It can be measured even if the value exceeds the threshold, and the indication error does not change much. The threshold value of general electromagnetic flowmeter is between 10-4～(5×10-6)S/cm, depending on the model. It also depends on the length of the flow signal line between the sensor and the converter and its distributed capacitance. The product manual usually stipulates the signal line length corresponding to the conductivity.
The sewage treatment process is mainly through biological oxidation, flocculation, precipitation and other processes to achieve the purpose of sewage purification. At each stage, a certain gauge is needed to measure.
In the sewage industry, according to the characteristics of the corrosiveness, abrasiveness, temperature and condensation of the tested substance and the price tolerance. Different lining and electrode materials should be selected.
In the sewage treatment process, it is necessary to configure corresponding detection instruments according to the process requirements to form a reliable control system.
Generally, sewage treatment plants are equipped with flow meters in the following process inspection procedures:
Water inlet pipe.
Detection of mud volume from primary settling tank to mud storage tank.
Detection of surplus and sludge flow in the sludge pump room.
Detection of the return sludge flow in the sludge pump room.
Detection of the effluent flow of the secondary settling tank distribution well.
Detection of the sludge intake of the digestion tank.
Digestion tank Mud output detection. 8. Flocculation tank reagent input detection, etc.
Magnetic Water Flow Meter to Measure Industrial Water
The conductivity of industrial water and its aqueous solution is greater than 10-4S/cm. The conductivity of acid, alkali and salt solution is between 10-4～10-1S/cm, so there is no problem in use. Low distilled water is 10-5S/cm and there is no problem.
The electromagnetic flowmeter cannot measure liquids with very low conductivity. Such as petroleum products and organic solvents. Cannot measure gas, steam and liquids containing more and larger bubbles.
It is found from the data that some pure liquids or aqueous solutions have low conductivity and are considered unusable. However, in actual work, we will encounter examples that can be used because of impurities. Such impurities are beneficial to increase conductivity.
For aqueous solutions, the conductivity in the data is measured in the laboratory with pure water ratio. The actual aqueous solution may be proportioned with industrial water. The conductivity will be higher than found, which is also conducive to flow measurement.
1. A material with relatively stable chemical properties in plastics can withstand boiling hydrochloric acid, sulfuric acid and aqua regia, but also resistant to concentrated alkalis and various organic solvents, and is not resistant to chlorine trifluoride, high-flow liquid fluorine, liquid oxygen, and ozone. corrosion. 2. Poor wear resistance
Strong corrosive media such as concentrated acid and alkali
PFA
Corrosion resistance is the same as PTFE, strong resistance to negative pressure
Can be used in negative pressure state
F46
1. Corrosion resistance is the same as PTFE 2. Low abrasion resistance 3. Strong negative pressure resistance
1. Same as PTFD 2. Can be used for low-wear media
Neoprene
1. Excellent elasticity, high breaking force, good wear resistance 2. Resistant to the corrosion of a certain low concentration of acid, alkali, and salt media, and not resistant to the corrosion of oxidizing media
Water, sewage, ore slurry, weak abrasive mud
Polyurethane
1. Excellent abrasion resistance (equivalent to 10 times of natural rubber) 2. Poor acid and alkali resistance 3. Cannot be used for water mixed with organic solvents
Neutral and strong abrasion slurry, coal slurry, mud, etc.
Corrosion resistance of electrode material:
Electrode material
Corrosion resistance
SUS316
Used for industrial water, domestic water, and weak alkali corrosive media, Widely used in petroleum, chemical, urea, vinylon and other industries
Stainless steel coated tungsten carbide
For non-corrosive, strong abrasive media
Hastelloy B (HB)
It has good corrosion resistance to all concentrations of hydrochloric acid below the boiling point, and it is also resistant to sulfuric acid, phosphoric acid, hydrofluoric acid, organic acids, etc. Corrosion of oxidizing acid, alkali, and non-oxidizing salt solution
Hastelloy C (HC)
It is resistant to oxidizing acids, oxidizing salts or other oxidizing agents.
Titanium (Ti)
It is resistant to corrosion by sea water, various chlorides and hypochlorites, oxidizing acids, organic acids, alkalis, etc., but not resistant to corrosion by purer reducing acids. But if the acid contains an oxidant, the corrosion is greatly reduced
Tantalum (ta)
It has excellent corrosion resistance, which is very similar to glass, except for hydrofluoric acid, fuming sulfuric acid and alkali, it can withstand the corrosion of almost all chemical media.
Platinum-iridium alloy
Almost suitable for all chemical substances, but not suitable for aqua regia and ammonium salt.
The price of electromagnetic flowmeter is determined by the selection of electromagnetic flowmeter. The Magnetic Water Flow Meter reference price is USD550.00-3000.
The key questions which need to be answered before selecting a magnetic flow meter are:
Is the fluid conductive or water based?
Is the fluid or slurry abrasive?
Do you require an integral display or remote display?
Do you require an analog output?
What are the minimum and maximum flow rate for the flow meter?
What are the minimum and maximum process pressure?
What are the minimum and maximum process temperature?
Is the fluid chemically compatible with the flow meter wetted parts?
Sino-Inst offers over 50 magnetic water flow meter for flow measurement. About 50% of these are wastewater flow meters, 40% is the liquid flow sensor. And 20% are Ultrasonic Flow Transmitter and mass flow meter.
A wide variety of flow meters options are available to you, such as free samples, paid samples.
Sino-Inst is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.
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Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
Magmeter Flow Meters are also called Electromagnetic flow meters or magnetic meters. Magmeter Flow Meter is a type of volumetric flow meter. It is mainly used to measure high-precision flow measurements of various conductive fluids. Such as water-based liquids, mixed media such as mud and sludge can also be measured.
Magmeter Flow Meters are based on the principle of electromagnetic induction. We Sino-Inst offer a range of full-bore and insertion electromagnetic meters. Covering pipe diameters from DN6 to DN3000. Accuracy can reach 0.5%.
Suitable for measuring two-phase flow containing suspended matter, solid particles, fibers, etc. Such as mud, sewage, ore pulp, pulp, and other viscous slurries.
It uses four electrodes and a built-in grounding electrode. It is used for non-conductive pipes without the need for additional electrical rings.
It also has 420mA current signal output, pulse output, and instantaneous flow upper and lower limit alarm outputs. RS485 communication and HART protocol are also available.
On-site display of instantaneous flow, percentage, flow rate, forward and reverse cumulative flow, and total cumulative amount.
The power supply mode can be selected from AC85V~AC220V or DC24V.
Daily reports, monthly reports, annual reports, power failures, and other functions can be queried with one click.
More Flow Meters
First, let us look at the structure of the magmeter.
The structure of electromagnetic flowmeter is mainly composed of magnetic circuit system, measuring catheter, electrode, shell, lining and converter.
The electromagnetic flowmeter is made according to Faraday’s law of electromagnetic induction. It is used to measure the volume flow of conductive liquid.
Faraday’s law of induction (referring to the induction of an electric potential inside the conductor when the conductor passes through a magnetic field) is the basic principle of electromagnetic flowmeter measurement.
This measurement principle can be applied to conductive fluids.
The fluid flows into a pipe whose magnetic field is perpendicular to the direction of the fluid, and the electric potential induced in the fluid can be measured using two symmetrically arranged electrodes.
The signal voltage UE is proportional to the magnetic induction intensity B, the electrode spacing D and the average fluid velocity v.
Because the magnetic induction intensity B and the electrode spacing D are constant. Therefore, the signal voltage UE is proportional to the average flow velocity v.
The equation used to calculate the volume flow rate shows that the signal voltage UE is linearly proportional to the volume flow rate.
The sensed signal voltage is converted into the graduation in the converter, analog and digital output signals.
Magmeter flowmeters measure the velocity of conductive liquids (such as water, acid, caustic and slurry) in the pipeline. When measuring deionized water, the minimum conductivity of the medium is 20uS/cm. For most liquids, the minimum conductivity required for measurement can be 5uS/cm.
Magmeter is mainly used in the following areas:
Measure clean water, sewage, domestic water, raw water;
Various acid, alkali, salt and other solutions;
Mud, mineral pulp, paper pulp, and food liquids, etc.;
It is widely used in metallurgy, papermaking, water treatment, chemical industry, light industry, textile, food and beverage, catering, agricultural irrigation, hydropower station, oil production, electric power and mining industries.
Magmeter liner selection should be selected according to the corrosiveness, abrasiveness and temperature of the measured medium.
Hard/soft rubber is resistant to general weak acid and alkali corrosion. Temperature resistance is 65℃. Soft rubber has abrasion resistance.
Polytetrafluoroethylene (PTFE) is almost resistant to strong acid and alkali corrosion except hot phosphoric acid. The temperature of the medium can reach 130℃. But it is not resistant to wear.
Polyurethane rubber has good wear resistance. But it is not resistant to acid and alkali corrosion. Temperature resistance is also poor. The medium temperature is less than 65°C.
Liner Materials
Functions
Applications
Hard rubber
1. It is resistant to hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid and 50% sulfuric acid, sodium hydroxide, and potassium hydroxide at room temperature. 2. Avoid strong oxidants.
1, below 70℃ 2. General acid, alkali, and salt solutions.
Soft rubber
1. It has good elasticity and good wear resistance; 2. It is resistant to the corrosion of general low-concentration acids, alkalis, and salt media, and is not resistant to the corrosion of oxidizing media.
1. The material with the most stable chemical properties in plastics. It can withstand boiling hydrochloric acid, sulfuric acid, nitric acid and aqua regia, as well as strong alkalis and various organic solvents; 2. Poor abrasion resistance and adhesion.
1.-40℃~+130℃C(PTFE), -40℃~+160℃(PFA); 2. Strong corrosive media such as acid and alkali; 3. Sanitary media.
PO
1. It can withstand hydrochloric acid, acetic acid, oxalic acid, ammonia, phosphoric acid, sulfuric acid, sodium hydroxide, and potassium hydroxide at room temperature. 2. It can withstand concentrated alkali and various organic solvents.
1. Below 70℃; 2. General acid, alkali, and salt solutions; 3. General water, sewage, mud, mineral slurry.
Ceramics
Wear resistance, high temperature resistance, corrosion resistance
Below 200℃
1.Environmental conditions:
Magmeter flowmeter, especially the flowmeter with intelligent LCD screen. The installation position should avoid direct sunlight as much as possible. The ambient temperature should be between 5℃~55℃.
2.Avoid strong interference sources
Choose a place where there is no strong electromagnetic field radiation to install the flowmeter.
Avoid devices that can easily cause electromagnetic interference, such as motors, transformers, and frequency converters.
The measurement principle of the flowmeter is based on Faraday’s law of electromagnetic induction, the original The initial signal is very weak, less than millivolt.
If there is strong electromagnetic field radiation near the flowmeter, it will affect the accuracy of the measurement and even fail to work normally.
3.Magmeter straight run
Pay attention to avoid eddy current generating parts as much as possible. Such as various valves, elbows, bypasses, etc.
Try to extend the straight pipe section upstream and downstream of the flowmeter. Install a rectifier tube if necessary.
Ensure that the upstream straight pipe section of the flowmeter must be at least 5 DN (measurement pipe diameter). The downstream is guaranteed to be more than 2 DN.
4.The conductivity of the liquid must be uniform and stable
Do not install the flowmeter in a place where the conductivity of the fluid to be measured is extremely uneven. If different media are injected upstream, the conductivity will be uneven and will affect the measurement.
In this case, it is recommended to move the injection port downstream.
If it must be injected from upstream, it should be as far away from the flowmeter as possible. Generally, it is better to keep a distance of more than 20 DN. To ensure that the liquid is fully mixed and uniform.
5.Keep the electrode axis level
The plane of the intermittent measuring electrode must be kept level. This prevents short-term insulation between the two electrodes due to air bubbles.
6.Magmeter grounding rings
Since the induction signal of the electromagnetic flowmeter is very weak, it is susceptible to noise. Therefore, the reference potential of the sensor and the converter must be the same as the measured liquid, and be grounded together.
The purpose of installing grounding rings or grounding electrodes on both sides of the electromagnetic flowmeter is to establish the equipotentiality between the flowmeter casing and the liquid.
Ordinary metal pipe (generally no need to install grounding ring)
When the pipeline itself is well grounded, the grounding wire can be omitted, but the casing must be connected to the liquid through the grounding wire equipped with the flowmeter.
A grounding ring (or grounding electrode) should be installed at both ends of the sensor and the measured medium should be short-circuited with the earth through the grounding wire.
Cathodic protection pipeline
The pipe flanges are connected by copper wires, but they must be insulated from the grounding wire.
Magnetic flowmeter is a widely used flow measuring instrument. How should we calibrate it?
Let’s take a look at the calibration method of electromagnetic flowmeter:
Determine the corresponding water pump according to the pipe diameter and flow rate of the verification test;
After the flowmeter is correctly installed and connected, it should be energized and preheated for about 30 minutes in accordance with the requirements of the verification regulations;
If the high-level tank water source is used, check whether the overflow signal of the stabilized water tower appears. Before the formal test, use the verification medium to circulate in the pipeline system for a certain period of time. At the same time, check whether there is any leakage in the sealing parts of the pipeline;
The verification medium should be filled with the electromagnetic flowmeter sensor before the formal verification. Then the downstream valve should be closed to adjust the zero position;
At the beginning of the verification, open the valve at the front of the pipeline and slowly open the valve behind the electromagnetic flowmeter to adjust the flow at the verification point.
During the calibration process, the flow stability of each flow point should be within 1% to 2%-flow method. The total amount law can be within 5%.
The temperature change of the verification medium should not exceed 1℃ when the verification process of a flow point is completed. It should not exceed 5℃ when the entire verification process is completed.
There must be a sufficiently high pressure downstream of the electromagnetic flowmeter to be checked to ensure that no flashing and cavitation occur in the flow pipeline;
After the test, close the valve at the front end of the test pipeline. Then stop the pump to avoid emptying the voltage stabilization facility. At the same time, the remaining verification medium in the test pipeline must be vented and the control system and the air compressor must be closed.
A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.
All electromagnetic flowmeters need to be calibrated when they leave the factory. Each finished product needs to pass the calibration line inspection before leaving the factory.
It is to install the product on the assembly line. The front end adopts a strictly debugged standard table. A series of coefficients such as the diameter of the flowmeter, the damping coefficient, and the sensor coefficient of the electromagnetic flowmeter are set at the back end. To achieve the same flow rate as the standard meter.
If calibration is done on-site, it may generally be used to calibrate outside the sealed pipeline. Such as portable ultrasonic flowmeter. But the accuracy is generally 0.5. If you just check it, you can use a portable ultrasonic flowmeter.
Ultrasonic flow meters and electromagnetic flow meters have different measurement principles.
Electromagnetic flowmeter must measure conductive liquid. The ultrasonic flowmeter can measure pure single-phase liquid. It has nothing to do with the conductivity of the liquid.
The electromagnetic flowmeter must be in contact with the medium to measure. The ultrasonic flowmeter can do contact and non-contact measurement.
The electromagnetic flowmeter is a flow measuring instrument. The measuring principle of the electromagnetic flowmeter is measured according to its principle of conduction. Most of the flow measurement on the market is solved by electromagnetic flowmeters.
The electromagnetic flowmeter is a pure liquid volume measurement instrument.
The mass flow meter is a function of fluid volume and fluid temperature and pressure. Is a dependent variable. The quality of a fluid is a quantity that does not change with time, space temperature, and pressure.
Mass flow meters are compared with electromagnetic flow meters. It can measure non-conductive media. This is one of the biggest differences. In addition, the accuracy of the mass flow meter is higher. The cost is large, and there are fewer applications in the market.
There is a big difference in the performance of general-purpose electromagnetic flowmeters on the market. Some have high precision and many functions. Some have low precision and simple functions.
The basic error of the instrument with high accuracy is (±0.5%～±1%)R. The instrument with low accuracy is (±1.5%～±2.5%)FS. The price difference between the two is 1 to 2 times.
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Magnetic flow meter manufacturers
Sino-Inst is one of the reliable Magnetic flow meter manufacturers and suppliers in China. Magnetic flow meters are applied for wastewater flow rate measurement.
Sino-Inst offer over 20 Magnetic flow meters, at the Best Price. A wide variety of Magmeters options are available to you, such as free samples, and paid samples.
Wu Peng, born in 1980, is a highly respected and accomplished male engineer with extensive experience in the field of automation. With over 20 years of industry experience, Wu has made significant contributions to both academia and engineering projects.
Throughout his career, Wu Peng has participated in numerous national and international engineering projects. Some of his most notable projects include the development of an intelligent control system for oil refineries, the design of a cutting-edge distributed control system for petrochemical plants, and the optimization of control algorithms for natural gas pipelines.
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