The ultrasonic flow meter measures the liquid flow rate quickly and effectively. There are two types of ultrasonic flowmeter technology: Doppler frequency shift and transit time.
Transit time ultrasonic flow meter is most suitable for measuring the flow of cleaning liquid. Therefore, it is the most popular type of ultrasonic meter.
Doppler ultrasonic flow meter can measure the frequency difference of sound waves reflected from bubbles or particles in the airflow. It is suitable for aerated or dirty liquids.
Sino-Inst offers a variety of Ultrasonic flow meters for flow measurement. If you have any questions, please contact our sales engineers.
Transit time Ultrasonic Flow Meter Working Principle
Transit time Ultrasonic Flow Meter adopts the measurement principle of time difference method. It uses the ultrasonic wave emitted by the sensor to propagate in the flowing fluid. The sound wave propagation speed in the downstream direction will increase, and the backward direction will decrease. In the same propagation distance, there will be different transmission times. According to the difference between the transmission time and the measured The relationship between fluid velocity measures the fluid velocity.
The flow rate of the fluid is different in different positions in the tube. The flow rate in the center of the tube is faster than the flow rate near the wall of the tube. The flow velocity distribution of the fluid in the pipeline can be represented by the flow velocity cross-sectional distribution diagram.
By setting the flowmeter and considering the cross-sectional distribution of the flow velocity, the average flow velocity can be calculated. Then the volume flow of the fluid can be obtained according to the cross-sectional area of the pipe.
Notes: V measure fluid velocity M ultrasonic reflection times D pipe diameter θ The angle between the ultrasonic signal and the fluid T up The time when the downstream sensor transmits the signal to the upstream T down Time from upstream sensor to downstream ΔT = T up – T down
Ultrasonic Doppler Flow Meter uses the physical principle of Doppler frequency shift to measure the water flow velocity.
Doppler effect (Doppler frequency shift) principle: The sound waves emitted by one object are received and reflected by another object. If the object emitting the sound wave is moving relative to the receiving object. The frequency of the sound wave received by the receiving object will be different from the frequency of the emitted sound wave.
If the relative distance between two objects is reduced, the received frequency will increase. If the relative distance between two objects is increased, the received frequency will decrease.
Such Doppler effects often occur in daily life. For example: when you hear the sirens (sounds) of an oncoming police car. The sound will appear higher in frequency. When the police car is far away from you, the sound it hears will become lower.
Through the difference between the frequency of transmitting ultrasonic waves and the frequency of receiving ultrasonic waves, the specific flow rate can be calculated. Then the water level is measured by the pressure sensor, and the water passing area is calculated from the water level and channel size. Finally, the velocity and area are integrated to calculate the final instantaneous flow.
Calculation formula: Velocity × water area × 3600 seconds = instantaneous flow rate (cubic meters/hour)
Ultrasonic Open channel flow meter working principle
The open channel flowmeter is based on the specific shape of the Parshall metering groove/weir plate metering groove. It guarantees a certain liquid level and knows a certain flow rate. The Parshall groove/weir plate metering groove is selected as the specific flow channel. The measurement accuracy is high. Easy to install.
The sensor measures the height of the liquid level, which is processed by 89C52 series single-chip microcomputers to obtain the instantaneous flow and cumulative flow values.
The flow can be expressed by the following formula: Q=KHn Q: Instantaneous flow rate (t/h)
K: Flow rate constant H: height of liquid level n: nth power value
The instantaneous flow is processed by the cumulative accumulation to obtain the cumulative flow.
Sino-Inst, Manufacturer for Ultrasonic Flow Meters. It can measure a single sound-conducting liquid medium of DN 25—150mm. It can measure even liquids such as water, sea water, oil, and slurry.
Sino-Inst’s Ultrasonic Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
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.
Precession vortex flowmeter is a new type of gas flowmeter. It can be used for the measurement of natural gas, propane, air, nitrogen and other gases.
Precession Vortex Gas Flowmeter, like vortex flowmeter, is a velocity flowmeter. The cost performance of the intelligent precession vortex flowmeter is higher than vortex flowmeter. The intelligent precession vortex flowmeter can only measure gas. Precession Vortex Gas Flowmeter can be made into an integrated temperature and pressure compensation. And can measure various gases. Such as compressed air, oxygen, biogas, natural gas, coal gas, etc.
Precession Vortex Gas Flowmeter reference price: DN50, USD 600.00/pc.
Sino-Inst offers a variety of flow meters for flow measurement. If you have any questions, please contact our sales engineers.
No mechanical moving parts, not easy to corrosion, stable and reliable, long life, long-term operation without special maintenance;
16 bit computer chip, high integration, small size, good performance, strong function;
The intelligent flowmeter integrates flow probe, microprocessor, pressure and temperature sensor into one, and adopts built-in combination to make the structure more compact, which can directly measure the flow, pressure and temperature of the fluid, and automatically real-time tracking compensation and compression factor correction;
Double probe detection technology, new sensor processing technology and reasonable installation method are adopted to greatly improve the signal strength, so that the sensor can accurately detect the signal and suppress the interference caused by pipeline vibration.
Adopt the domestic leading intelligent anti-seismic technology, effectively restrain the disturbance signal caused by vibration and pressure fluctuation;
The Chinese character dot matrix display screen is adopted, which can display the volume flow under working state, volume flow under standard state, total volume, medium pressure, temperature and other parameters directly.
The converter can output frequency pulse, 4 ~ 20mA analog signal, and has RS485 interface, can be directly connected to the computer network, transmission distance up to 1.2km;
With signal transfer output of several physical parameters, users can choose any of them.
Pressure and temperature signals are the input mode of the sensor with strong interchangeability.
The power consumption of the whole machine is low, which can be supplied by built-in battery or external power supply.
Specifications of Precession Vortex Gas Flowmeter
Inside nominal diameter DN (mm)
Range of flow (m3/h)
Nominal pressure (Mpa)
Pressure loss (kpa)
Class of accuracy
Repetitive
Shell material
15
0.6~12
1.6 2.5 4.0 6.3 10.0 16.0 25.0
△P=ρ/1.205×PN
1.0 1.5
Less than the base error limit is definitely worth 1/3
Both flow meters can be made into a temperature and pressure compensation system, and can measure various gases, such as compressed air, oxygen, biogas, natural gas, coal gas, etc.;
Both flowmeters have no mechanical moving parts, are not easy to be corroded, are stable and reliable, have a long life, and do not require special maintenance for long-term operation;
The highest accuracy of both flowmeters can reach 1.0%.
The difference between precession vortex flowmeter and vortex flowmeter
The working principles of the two flow meters are different;
The intelligent precession vortex flowmeter can only measure gas, while the intelligent vortex flowmeter can also measure liquid and steam;
The maximum caliber of the intelligent precession vortex flowmeter can only achieve 200 caliber, while the maximum caliber of the intelligent vortex flowmeter can achieve 1000 caliber, of which 300-1000 is a plug-in type;
The cost performance of the intelligent precession vortex flowmeter is higher than that of the intelligent vortex flowmeter;
Precession Vortex Gas Flowmeter Structure
Flow meter is composed by below parts:
Swirl generation body Made by aluminium alloy, with certain angle screw blades, it is fixed in front of the housing contraction, then press the fluid and generate strong swirl flow.
Housing It has flange itself, and with certain shape fluid channel, according to different working pressure, the housing could adopt cast aluminium alloy or stainless steel.
Intelligent flow totalizer It is combined of temperature, pressure testing analogue channel, flow testing no. Channel and micro processing unit, LCD drive circuit and other assistant circuit, with the extermal output interfernce.
Temperature sensor Use the PT100 platinium resistance as the temperature sensitive element, under certain temperaure range, the resistance and temperature is correspond with each other.
Pressure sensor Use the diffused silicon piezoresistive type bidge road as the sensitive element, the bridge arm resistance will happen some expected change under pressure effect, under certain excitation current, the two output terminal potential difference in proportion to the outer pressure.
Piezocrystal flow sensor It is installed at the throat near the housing contraction section, it could test the frequency of swirl.
Clear swirl part It is fixed at the housing exit section, the function is clear the swirl and decrease the influence to the downstream instruments performance.
Precession Vortex Gas Flowmeter Working Principle
The flow profile of the Precession Vortex Gas Flowmeter is similar to the profile of a Venturi tube.
A set of spiral guide vanes are placed on the inlet side. When the fluid enters the flow sensor, the guide vane forces the fluid to produce a violent vortex. When the fluid enters the diffusion section, the vortex flow is affected by the backflow and starts to rotate twice. A gyroscopic vortex precession phenomenon is formed.
The precession frequency is proportional to the flow rate and is not affected by the physical properties and density of the fluid. The second rotation precession frequency of the fluid measured by the detecting element can obtain good linearity in a wide flow range.
The signal is amplified, filtered and shaped by a preamplifier and converted into a pulse signal proportional to the flow rate. Then, together with the detection signals of temperature and pressure, they are sent to the microprocessor for integration processing. Finally, the measurement result is displayed on the LCD screen. Including instantaneous flow, cumulative flow and temperature and pressure data.
Precession Vortex Gas Flowmeter Flow Totalizer Working Principle:
Flow totalizer is combined with temperature,pressure testing analogue channel, flow sensor channel and micro processing unit, and with the external output signal interface, with many output signals, the micro processor in the flow meter will carry out the temperature and pressure compensation according to gas state equation, and carry out the compress factor amendment. The gas state equation as below:
In the formula: QN ——flow volume under standard condition. (m3/h)； QV ——flow volume under working condition. (m3/h)； Pa ——local atmospheric pressure（KPa）； P ——flow meter tapping hole measured meter pressure（KPa）； PN ——atmospheric pressure under standard condition.（101.325 KPa）；
TN ——absolute temperature under standard conditions.（293.15K）； T ——the absolute temperature of measured fluid.（K）； ZN ——the gas compression factor under standard condition. ； Z ——the gas compression factor under working conditions； Note: when use the bell jar or negative pressure calibrate, use ZN/Z=1, for natural gas (ZN/Z)1/2=FZ is super compression factor, calculated according to the China National Petroleum Corporation standard SY／T6143－1996 formula.
Gas Flow Meter Types
The gas flow meter is a precision instrument used to measure the cumulative flow of gas in the pipeline. There are three main methods for flow measurement:
Positive displacement flow meters, such as diaphragm gas meters, Roots flow meters, etc., accurately measure and settle the gas by rotating the volumetric volume.
A velocity gas flow meter that measures the volume of fuel gas by the gas flow rate.
The way of gas measurement by pressure difference.
Velocity flow meter Velocity flow meters are a type of flow meters based on the principle of directly measuring the flow velocity of a full pipe in a closed pipeline. ① Turbine flowmeter ② Vortex flowmeter ③ Precession vortex flowmeter ④ Time difference ultrasonic flowmeter
Positive displacement flow meter Roots flowmeter (gas lumbar flowmeter)
When using a gas flow meter, due to the influence of the error factors caused by the working conditions and environmental changes. After the uncertainty analysis and the verification of the field experiment data, to meet the requirements of the field use, it is necessary to perform the gas flow meter calibration.
How to calibrate the gas flow meter?
Work status check: According to the requirements of the gas flowmeter instruction manual. First, check to determine whether the gas flowmeter is working properly.
According to the gas flowmeter calibration certificate or factory calibration sheet, check whether the input of the key parameters affecting the measurement accuracy in the converter is correct.
For pipelines with stopped flow conditions, check the zero flow of the flowmeter.
Remote calibration requires that the gas flow meter must be removed and sent to the secondary or primary flow standard for calibration, and then these new calibration factors are input to the existing data acquisition system.
Although remote calibration may provide higher accuracy. However, from a systematic point of view, this method may not be accurate and true, and it is expensive and laborious to operate.
What are the requirements for gas flow meter calibration?
If the flow conditions can be estimated, then the gas flowmeter can be calibrated under conditions different from the operating conditions. The parameter used to estimate the flow conditions is usually a number with respect to the inlet diameter of the gas flowmeter.
First, convert the operating condition range to a number range.
Secondly, the selected calibration equipment must meet the specified number range.
Then, calibrate under different pressure conditions or using different gases.
Within a certain accuracy level, the characteristics of standard differential pressure gas flow meters are well known. Likewise, the characteristics of certain types of turbine gas flow meters are also known.
In some cases, it is necessary to perform several tests before the final calibration to verify whether the gas flowmeter is operating in compliance with the calibration coefficient.
In the future, some work needs to be done to identify the performance of the vortex baffle gas flowmeter, and to determine the performance of the ultrasonic gas flowmeter and the complementary gas flowmeter in the case of high-pressure gas.
Gas flow turbine meter
Gas turbine flow meter is a velocity flow meter that measures gas flow. For natural gas, nitrogen, and gas trade measurement.
The gas turbine flowmeter integrates temperature, pressure, flow sensors and intelligent flow totalizers. The gas turbine flowmeter has high accuracy and good repeatability, so it is suitable for trade measurement and industrial process detection. It is widely used in many kinds of gas in petroleum, chemical, metallurgy, aviation, scientific research and other sectors and industrial fields. Such as natural gas, city gas, propane, butane, air, nitrogen and other gases measurement.
Gas Turbine Flow Meter reference price: USD900-2500/pc
Natural gas flow meter is mainly used for inline measurement of natural gas flow. Natural gas flow meter is mainly used for industrial production and trade settlement.
At present, the flowmeter products used for natural gas flow measurement roughly include: gas waist wheel flowmeter, gas turbine flowmeter, precession vortex flowmeter, thermal mass flowmeter, vortex flowmeter, ultrasonic flowmeter and orifice flowmeter Wait. Let’s make a simple comparison on the use of these flow meters.
LPG flow meter is used for flow measurement of liquefied petroleum gas. The flow measurement of LPG is very important in industrial production, transportation and trade settlement.
LPG gas (Liquefied petroleum gas) is a kind of hydrocarbon with propane and butane as its main components. LPG is used for heating, motor fuel, industrial applications and in agriculture. LPG can be in a gas or liquefied state. Different type industrial LPG flow meters with accurate and reliable performance. Such as thermal dispersion flow meter, Coriolis flow meter, gas turbine flow meter, vortex flow meters.
Sino-Inst, Manufacuturer for Precession Vortex Gas Flowmeters.
Sino-Inst’s Precession Vortex Gas Flowmeters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
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.
Vortex flow meter is suitable for measuring steam as well as a variety of liquids and gases. Wafer Flange Vortex Flowmeter is suitable for low pressure pipes. Cost is lower.
Wafer Flange Vortex Flowmeter means that the flowmeter body does not have flanges. The pipeline has flanges. The pipeline is tightened by bolts to clamp the flowmeter hard, so it is called clamping. The flange type Vortex Flowmeter is that the body and the pipeline have flanges. Use A pair of flanges are fixedly installed. Therefore, the pressure and caliber of the Wafer Flange Vortex Flowmeter is not high. However, two flanges are saved, which can be cheaper.
Suitable for use in petrochemical and other hazardous situations requiring explosion protection;
Explosion-proof certification mark: Ex ia ⅡC T6 Ga;
Explosion-proof vortex flowmeter. It is not allowed to open the circuit shell when the power is on. It is necessary to alternately switch on and off the power supply for repeated adjustments, which is inconvenient and prone to errors and dangers;
Intrinsically safe vortex flowmeter. It can be operated at will when the power is on, which is convenient and safe.
On-site LCD display, pulse, 4-20mA output or 485 communication, can be connected with industrial automation syst
Specifications of Wafer Flange Vortex Flowmeter
Measuring medium
Superheated/saturated steam, liquid and gas
Measuring range
See flow range table for details
caliber
Wafer type/flange type: DN15~DN400~DN1000
Medium temperature (℃)
(-40~80)℃, (-40~150)℃, (-40~300)℃, (-40~400)℃
Environment temperature (℃)
(-20~+70)°C atmospheric pressure: 86kPa～106kPa
Nominal pressure
Liquid 1.6MPa, 2.0MPa, 2.5MPa, 4.0MPa, 5.0MPa, 6.3MPa, 10.0MPa, 25MPa Gas and steam 1.6MPa, 2.0MPa, 2.5MPa, 4.0MPa, 5.0MPa
Accuracy
±1.0%, ±1.5%
Flow rate range (m/s)
Liquid: 0.15~7 Gas: 1.5~60 Steam: 2~70
output signal
Three-wire voltage pulse: high level≥5V low level<1V Standard current signal: (4-20) mA standard current signal proportional to the flow rate, local display flow, cumulative flow. And output proportional to the flow rate (4-20) mA standard current signal and pulse frequency signal Communication method: RS-485 communication
Power supply
Three-wire voltage pulse: DC12V, DC24V Standard current output, local display: DC24V Battery power supply (lithium battery): 3.6V
Integrated installation; split installation (the measuring tube and the indicator are connected by a 10-core special shielded cable)
Vortex Flowmeter Installation Method
Vortex flowmeters are divided into different installation forms: flange type, clamp type, plug-in type, thread type and clamp type.
When selecting the vortex flowmeter, the flange type is given priority, followed by the clamping type and the plug-in type.
The reason is that the accuracy of clamp-on and insertion type is greatly affected by the installation, and non-standard installation will produce errors.
The installation methods of vortex flowmeters differ as follows:
Flange type: The instrument is connected to the process pipeline through its own flange, with high pressure resistance and large caliber range. high cost.
Clamping type: The instrument is clamped and fixed on the process pipeline by the flange on the pipeline, with low pressure resistance and small caliber range. low cost.
Plug-in type: suitable for large diameter pipes. Ball valves can be installed. Convenient online installation and disassembly.
Threaded type: Threaded installation can only be used for small diameter pipes. Internal thread/external thread installation can be customized.
Clamp type: 316 stainless steel clamp accessories. It is suitable for food, medicine and other hygiene industries. Installation is quick and easy.
Vortex flow sensor has high precision and wide range ratio, no moving parts in use, which can improve mechanical stability and reduce maintenance.Vortex flowmeter is almost not affected by the temperature, pressure and composition of medium when measuring the volume of working condition.
Therefore, it is convenient to calibrate the instrument, so vortex street flow sensor is widely used in production and life.
When a trigonal column vortex generator is set in the fluid, regular vortices are generated alternately on both sides of the vortex generator, which is called Carmen vortex.
The vortex columns are arranged asymmetrically downstream of the vortex generator. Vortex flowmeter is produced according to this principle.
Vortexes are generated by generating bodies and the number of vortexes is detected by high-sensitivity sensors. In a certain range, the number of vortexes generated is proportional to the flow rate.
In vortex flowmeter, the relationship between flow rate and the number of vortexes generated can be expressed by the following formula：
Q：Operating volume flow of the measured medium. The unit is m3/h。 F：Frequency of the number of vortices produced by the generating body. The unit is Hz. K：Refers to the calculated or calibrated flow coefficient. It represents how many frequency signals per cube. the coefficient is usually obtained by calibration.
The formula of standard table method calibration coefficient K:
The accuracy is high, the repeatability is 0.5%, and the maintenance is small.
Disadvantages of vortex flowmeter
The volume flow of the vortex flowmeter is not affected by the temperature, pressure, density and other thermal parameters of the measured fluid. But the final measurement result of liquid or steam should be the mass flow rate, and for gas, the final measurement result should be the standard volume flow rate. Both mass flow and standard volume flow must be converted by fluid density, and changes in fluid density caused by changes in fluid working conditions must be considered.
The factors that cause errors are: errors caused by uneven pipeline flow rates; inability to accurately determine the density of the medium when fluid conditions change; and the wet saturated steam is assumed to be dry saturated steam for measurement. If these errors are not limited or eliminated, the total measurement error of the vortex flowmeter will be very large.
Poor vibration resistance. External vibration will cause errors of the vortex flowmeter, or even fail to work normally. The high-velocity impact of the channel fluid will cause additional vibrations to the cantilever of the vortex generator, which reduces the measurement accuracy. The influence of large pipe diameter is more obvious.
Poor adaptability to measuring dirty media. The generating body of the vortex flowmeter is very easy to be dirty by the medium or entangled by the dirt, and the change of the geometric body size will greatly affect the measurement accuracy.
High requirements for straight pipe sections. Experts pointed out that the straight pipe section of the vortex flowmeter must ensure the front 40D and the 20D to meet the measurement requirements.
Sino-Instt offer over 10 Voretx FlowMeters, with Best Price.
A wide variety of Voretx Flow Meters options are available to you, such as free samples, paid samples. All of our flow meters can wokrk with the AMS NEW TREX.
Sino-Inst is Voretx Flow Meter suppliers, located in China. Vortex shedding flow meter products are most popular in North America, Mid East, and Eastern Europe.
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.
Hygienic Flow Meteruses stainless steel tri-clamp fittings. Meet the hygiene measurement requirements of food-processing and bio-technology/ pharmaceutical industries.
Hygienic and clean flow metering instruments for measuring the movement of substances in food, beverage and pharmaceutical processes. Hygienic measuring instruments are designed for the food, beverage and pharmaceutical industries, which require a high degree of cleanliness during manufacturing. The Vortex Hygienic Flow Meter is a flowmeter that can be used to measure instantaneous and cumulative flow of liquids, gases and steam.
Vortex Hygienic Flow Meter reference price: USD 300-700/pc.
Sino-Inst offers a variety of Vortex flow meters for flow measurement. If you have any questions, please contact our sales engineers.
Dedicated to the sanitary industry, simple internal components, clamp connection;
Software configuration can realize various configurations required for different measurements of different media;
Parameter setting can set the measurement parameters of different fluids. Example: gas deviation coefficient, instrument coefficient, rated value, etc.;
Self-diagnosis diagnoses the setting parameter range, generator output signal, signal sending and receiving, CPU failure, etc.;
Display function Various parameters such as diagnostic code, flow, total, flow percentage, etc.;
On-site LCD display, pulse, 4-20mA output or 485 communication, can be connected with industrial automation system.
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.
Sanitary turbine flow meters have stainless steel bodies and come standard with Tri-Clover fittings. A Sanitary flow meter is suitable for measuring liquid without impurities. It can output pulse frequency signal. It is used to detect instantaneous flow and total integrated flow. Sanitary flow meter can be used in food, sport drink, liquor and other beverage industries, in preprocess applications.
Sanitary metal rotor flowmeters are mainly used in food, beverage, pharmaceutical and other industries. In the production process, it mainly plays the role of metering, ingredient control, and finished product filling. The material needs to be corrosion-resistant to prevent contamination of the product. The structure should not be too complicated and should be simpler. To prevent residual material inside the flowmeter, it is inconvenient to clean. These conditions are met to meet the usage requirements.
For example, a peanut oil processing company needs to use a flowmeter to measure the volume weight of the primary processed oil and the final refined oil, as well as the quantitative control in the filling process.
The vortex flowmeter has no moving parts, and the measuring element has a simple structure, reliable performance and long service life.
The vortex flowmeter has a wide measuring range. The turndown ratio can generally reach 1:10.
The volume flow of the vortex flowmeter is not affected by thermal parameters such as the temperature, pressure, density or viscosity of the fluid being measured. Generally, no separate calibration is required. It can measure the flow of liquid, gas or steam.
The volume flow of the vortex flowmeter is not affected by the temperature, pressure, density and other thermal parameters of the measured fluid. But the final measurement result of liquid or steam should be the mass flow rate, and for gas, the final measurement result should be the standard volume flow rate. Both mass flow and standard volume flow must be converted by fluid density, and changes in fluid density caused by changes in fluid working conditions must be considered.
The main factors that cause flow measurement errors are: measurement errors caused by uneven pipeline flow rates; inability to accurately determine the density of the medium when fluid conditions change; and the wet saturated steam is assumed to be dry saturated steam for measurement. If these errors are not limited or eliminated, the total measurement error of the vortex flowmeter will be very large.
Poor vibration resistance. External vibration will cause measurement errors of the vortex flowmeter, or even fail to work normally. The high-velocity impact of the channel fluid will cause additional vibrations to the cantilever of the vortex generator, which reduces the measurement accuracy. The influence of large pipe diameter is more obvious.
Poor adaptability to measuring dirty media. The generating body of the vortex flowmeter is very easy to be dirty by the medium or entangled by the dirt, and the change of the geometric body size will greatly affect the measurement accuracy.
High requirements for straight pipe sections. Experts pointed out that the straight pipe section of the vortex flowmeter must ensure the front 40D and the 20D to meet the measurement requirements.
Poor temperature resistance. Generally, vortex flowmeters can only measure the fluid flow of media below 300°C.
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A wide variety of Vortex Hygienic Flow Meters options are available to you, such as free samples, paid samples. All of our flow meters can work with the AMS NEW TREX.
Sino-Inst is a Vortex Hygienic Flow Meter supplier, located in China. Vortex shedding flow meter products are most popular in North America, Mid East, and Eastern Europe.
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 Temperature Flow Meter is suitable for high temperature flow monitoring. Suitable for high temperature, high pressure, safety and explosion-proof.
The High Temperature Flow Meter uses a split signal converter. The way the vortex body is separated from the vortex converter. The Vortex Split High Temperature Flow Meter is suitable for high temperature, high pressure, safety and explosion-proof applications, where you need to watch the meter data on site. It is widely used in the measurement of steam, gas and liquid. And inconvenience Under complex conditions of reading data.
Vortex Split High Temperature Flow Meter reference price: USD 500-1500/pc.
Sino-Inst offers a variety of Vortex flow meters for flow measurement. If you have any questions, please contact our sales engineers.
Three-wire voltage pulse: high level≥5V low level<1V Standard current signal: (4-20) mA standard current signal proportional to the flow rate, local display flow, cumulative flow. And output proportional to the flow rate (4-20) mA standard current signal and pulse frequency signal Communication method: RS-485 communication
Power supply
Three-wire voltage pulse: DC12V, DC24V Standard current output, local display: DC24V Battery power supply (lithium battery): 3.6V
Vortex Split High Temperature Flow Meter Applications
The split display type vortex flowmeter (external power supply, internal battery power supply) can measure almost all conductive, non-conductive, sound-conducting, non-sound-conducting, low-temperature, high-temperature, and viscous media, such as liquid, gas, and steam.
Split display type vortex flowmeter (external power supply, internal battery power supply) is widely used in schools, research institutes, food plants, chemical plants, petroleum, metallurgy, coal mines, pharmaceutical plants, hotels, restaurants, power plants, steel plants, etc. Large and small enterprises in various industries.
The split display type vortex flowmeter is an ideal product for obtaining data from scientific research experiments, real-time measurement of equipment consumption, factory performance evaluation, energy saving and emission reduction, and trade settlement between A and B.
The thermal gas mass flow meter is designed based on the principle of thermal diffusion, which uses the constant temperature difference method to accurately measure the gas. The sensor part consists of two reference grade platinum resistance temperature sensors. Thermal gases are widely used in factory compressed air, blast furnace gas measurement in ironworks, and monitoring and measurement of chimney flue exhaust.
The clamp-on ultrasonic flowmeter composed of wall-mounted host and clamp-on flow sensor can be widely used in various water treatment industries. Applied to online measurement of various liquid volume flow. The main unit and the sensor are installed separately: the sensor is installed on the pipeline, the wall-mounted main unit is installed indoors or in the instrument box, and the main unit and the sensor are connected with an ultrasonic special cable. It is currently the most widely used ultrasonic flowmeter.
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.
Liquid turbine flow meter is the main type of impeller type flow (velocity) meter. It is composed of sensors and conversion display. The sensor uses a multi-blade rotor to sense the average flow rate of the fluid, thereby deriving the flow or total amount. Liquid turbine flow meter is suitable for measuring liquids that are not corrosive to stainless steel 1Cr18Ni9Ti, 2Cr13 and corundum Al2O3 in closed pipelines and are free of impurities. For milk, soybean oil, edible oil, diesel, purified water.
Sino-Instt offer over 10 High Temperature Flow Meters, with Best Price.
A wide variety of High Temperature Flow Meters options are available to you, such as free samples, paid samples. All of our flow meters can wokrk with the AMS NEW TREX.
Sino-Inst is High Temperature Flow Meter suppliers, located in China. High Temperature Flow Meter products are most popular in North America, Mid East, and Eastern Europe.
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.
Nitrogen gas flow meter is used to measure the flow rate of N2 gas. Digital vortex flowmeter can be flange-Wafer-threaded installation. Threaded is suitable for small diameter pipes.
Nitrogen gas flow meter is easy to use, reasonably priced. Threaded connection is a widely used detachable fixed connection. It has the advantages of simple structure, reliable connection, and convenient assembly and disassembly. Nitrogen is required in many processes of the chemical and pharmaceutical industry. Predominantly as protective gas, to prevent the occurrence of explosive atmospheres. Sino-Inst vortex flowmeter can be used for natural gas, nitrogen, biogas and other gases.
Vortex Nitrogen Gas Flow Meter reference price: USD 400-1000/pc.
Sino-Inst offers a variety of Vortex flow meters for flow measurement. If you have any questions, please contact our sales engineers.
5 matters to pay attention to when choosing threaded Vortex Nitrogen Gas Flow Meter
The principle of the vortex flowmeter is to install a stagnant part in the flowmeter pipe. When the fluid flows through the stagnant part. Due to the stagnant effect on the surface of the stagnant part, there will be two asymmetric rows downstream.
These vortices are separated on the side and rear of the stagnant member to form a so-called Karman vortex train. The rotation directions of the two vortices are opposite. Karman theoretically proved that when h/L=0.281, the vortex train is stable. h is the width between two vortex rows, and L is the distance between two adjacent vortices
Correct selection can ensure the better use of threaded connection vortex flowmeter. What kind of vortex flowmeter should be selected according to the physical and chemical properties of the fluid medium to be measured?
Precise function inspection
Accuracy grade and function Choose the instrument accuracy grade according to the measurement requirements and use occasions, so as to be economical and cost-effective. For example, it is used for trade settlement, product handover and energy metering occasions. The accuracy level should be higher, such as 1.0, 0.5, or higher.
For process control occasions, different accuracy levels can be selected according to control requirements.
For some occasions that just check the process flow and do not need to do precise control and measurement, you can choose a slightly lower accuracy level, such as 1.5, 2.5, or even 4.0. In this case, you can choose a cheap plug-in vortex flowmeter.
2. Measurable medium
When measuring general media, the full-scale flow of the vortex flowmeter can be selected within the range of 0.5-12m/s of the measured medium flow rate, and the range is relatively wide. The selected instrument specification (caliber) is not necessarily the same as that of the process pipeline. It should be determined whether the measurement flow range is within the flow rate range. That is, when the flow rate of the pipeline is low and cannot meet the requirements of the flow meter or when the measurement accuracy cannot be guaranteed at this flow rate. It is necessary to reduce the caliber of the instrument to increase the flow velocity in the pipe and obtain satisfactory measurement results.
3. Selection of screw connection vortex flowmeter transmitter
In the saturated steam measurement, the VA piezoelectric vortex flow transmitter is used. Because the vortex flowmeter has a wide range. Therefore, in practical applications, it is generally considered that the flow rate of the saturated steam should not be lower than that of the vortex flowmeter. Lower limit. That is to say, the fluid velocity must not be lower than 5m/s.
Vortex flow transmitters of different calibers can be selected according to the amount of steam used. The caliber of the transmitter cannot be selected by the caliber of the existing process pipeline.
4. Selection of pressure compensation pressure transmitter
Because the saturated steam pipeline is long, the pressure fluctuates greatly. Pressure compensation must be used. Considering the corresponding relationship between pressure, temperature and density, only pressure compensation can be used in the measurement. Because the pipeline saturated steam pressure is in the range of 0.3-0.7MPa. Pressure The range of the transmitter can be 1MPa.
5. Selection of display instrument for screw connection vortex flowmeter
Intelligent flow indicator, with functions of voltage stabilization compensation, instantaneous flow display and cumulative flow accumulation.
Vortex flowmeter. Directly measure the volume flow of gas and liquid. It is necessary to add temperature and pressure measuring sensors and totalizers to calculate mass flow.
Orifice flowmeter. The orifice is used as a throttling element. With a differential pressure transmitter, the volume flow can be calculated. To convert into mass flow, temperature and pressure sensors and totalizers must also be added.
Nitrogen is required in many processes of the chemical and pharmaceutical industry; predominantly as protective gas, to prevent the occurrence of explosive atmospheres。
Such as when handling dusty products or solvents.
If your work requires you to use nitrogen, having a flow meter installed on your tank is a great way to save some money.
These indicators let you know whether gas is moving through the line, often via the use of a levitating ball, a pressure gauge, or other visual cues.
These options are simple to use and reliable, making them must-haves for welders, HVAC technicians, and more.
There are many types of Nitrogen gas flow meters. There are three types of flow meters commonly used to measure nitrogen. Precession vortex flowmeter, gas vortex flowmeter, thermal gas mass flowmeter. When selecting a model, it is necessary to select a suitable model and specification according to the parameters and cost that can be provided on-site.
Nitrogen Flowmeters are a type of flow meter that can measure the flow of nitrogen or liquid nitrogen. The common nitrogen flow rates are nitrogen and liquefied nitrogen. Nitrogen is often referred to as an inert gas. Used in metal processing in some inert atmospheres. When it is liquid, it is a common reagent for cooling, cooling, and freezing. Optimize your nitrogen system and save costs. Therefore, it is very important to accurately measure the nitrogen flow rate.
A gas flow meter is an instrument that measures the flow of gas. Installed in the pipeline to record the amount of gas flowing through. Can measure gas, air, nitrogen, acetylene, phosgene, hydrogen, natural gas, nitrogen, LPG, hydrogen peroxide, flue gas, methane, butane, chlorine, gas, biogas, carbon dioxide, oxygen, compressed air, argon Gas, toluene, benzene, xylene, hydrogen sulfide, sulfur dioxide, ammonia, etc.
There are many types of gas flow meters. Such as vortex flowmeter, precession vortex flowmeter, orifice flowmeter, thermal mass flowmeter, rotor flowmeter, etc. For the working principle of the specific gas flow meter, you need to query the specific flow category.
During actual measurements. Because nitrogen has similar properties to air. So the air flow meter can measure nitrogen.
However, in theory, it is not universal. Because the measured medium is different: one is nitrogen and the other is air. The flow meter coefficients are different. Best to check with the flow meter supplier.
The price of different flowmeters varies a lot. The exact flow meter price needs to be calculated based on the measurement parameters.
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Sino-Instt offer over 10 Threaded Vortex Nitrogen Gas Flow Meters, with Best Price.
A wide variety of Threaded Vortex Nitrogen Gas Flow Meters options are available to you, such as free samples, paid samples. All of our fNitrogen Gas Flow Meters can wokrk with the AMS NEW TREX.
Sino-Inst is Threaded Vortex Nitrogen Gas Flow Meter suppliers, located in China. Nitrogen Gas Flow Meter products are most popular in North America, Mid East, and Eastern Europe.
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.
Compressed air flow meter is a upgraded and improved gas vortex flow meter. The karman vortex air flow sensor is researched and produced according to the Karman vortex principle.
Compressed air is an important energy source for manufacturing companies. Therefore, accurate measurement is of great significance to energy saving, emission reduction and cost accounting in the factory. Sino-Inst Vortex compressed air flowmeter is resistant to pipeline vibration. The value is not easy to jump randomly. An excellent partner for you to achieve accurate measurement. Integrated temperature and pressure compensation. The compensated instantaneous flow and cumulative flow can be read directly on the meter, Temperature, pressure and other data.
Easy to install. Suitable for the measurement of compressed air, nitrogen, argon and other gases;
Integrated temperature and pressure dual compensation. The instantaneous flow and accumulated flow, temperature, pressure and other data after compensation can be directly read on the meter head;
The most advanced FFT spectrum analysis digital signal processing technology is adopted. The lower limit is low and the anti-vibration performance is excellent. It can be installed at the outlet of the air compressor to measure the air output of the air compressor;
RS485 communication output. Equipped with related conversion modules, it can output wireless signals such as NB and GPRS, which can be used with the Internet of Things platform;
Simple structure, no holes and gaps design. No wear, stain resistance, no moving parts. Low failure rate, high stability and reliability;
The vortex flowmeter uses the latest signal processing technology, and the entire system analyzes the measured signal. Then eliminates external interference and media disturbance. Therefore, stable measurement can be achieved even in harsh process conditions;
The piezoelectric element of the vortex flowmeter is embedded in the probe body. It does not touch the medium, and there is no filler inside. The pressure loss is small and the service life is long;
The original signal formed by the vortex flowmeter. The output frequency and flow rate are linear. There is no zero drift problem.
Specifications of Vortex Compressed Air Flow Meter
Measuring medium
compressed gas
Measuring range
See the flow range table of vortex flowmeter for details
口 Path
DN15~DN600
Connection method
Wafer type, flange type
Medium temperature (℃)
(-40~80)℃、(-40~400)℃
Environment temperature (℃)
(-30~+65)℃ Atmospheric pressure: 86kPa～106kPa
Accuracy
1.0%, 1.5%
Velocity range (m/s)
1.5~60
Output signal
1: No local display frequency signal: high level≥5V low level 1V, square wave, pulse duty ratio: 1:1, emitter follower output (optional open collector output) 2: Standard current signal; (4-20) mA standard current signal proportional to the flow 3: Local display instantaneous flow, cumulative flowmeter. Simultaneously output proportional (4-20) mA standard current signal and pulse frequency signal or (4-20) mA+HART 4: Communication method: RS485 communication
Power supply
Voltage pulse type: DC12V, DC24V Standard current output, local display: DC24V Battery powered local display lithium battery: 3.6V
Instantaneous standard flow, cumulative standard flow, pressure, temperature, instantaneous working condition flow, instantaneous cumulative flow, frequency
The vortex compressed air flowmeter is a volume flowmeter that measures the volume flow of gas, steam or liquid, the volume flow or mass flow of the standard condition according to the Karman vortex principle.
When a triangular cylindrical vortex generator is installed in the fluid, regular vortices are alternately generated from both sides of the vortex generator. This type of vortex is called Karman vortex. When the fluid passes through the vortex flow transmitter in the pipeline, two rows of vortices proportional to the flow velocity are alternately generated up and down behind the vortex generator of the triangular column. The release frequency of the vortex is related to the average velocity of the fluid flowing through the vortex generator and the characteristic width of the vortex generator.
The temperature compensation integrated vortex flowmeter also has a temperature sensor. The temperature of saturated steam can be directly measured and the pressure can be calculated. This shows the mass flow of saturated steam.
The temperature and pressure compensation integrated type is equipped with temperature and pressure sensors for gas flow measurement. The temperature and pressure of the gas medium can be directly measured to display the standard volume flow rate of the gas.
Compressed air is an important secondary energy source for industrial production. Most of it is converted from electrical or thermal energy through compressors. The working fluids converted from a large amount of energy are managed to achieve the effect of saving energy and improving equipment management. Compressed air It is an important economic indicator for cost accounting of enterprises and institutions. This is the main purpose of compressed air flow measurement.
Compressed air flow is an important parameter that expresses the performance of an air compressor, and it is also an important parameter measured in an industrial process. With the widespread application of air compressors, accurate measurement of its flow is essential for product upgrades, industrial production process control and monitoring, and energy conservation and emission reduction.
Compressed air has the following characteristics. Sino-Inst suggestion: Combine the characteristics of compressed air to make a reasonable selection of compressed air flow meters.
Large vibration
Of course, not every air flow meter is installed in places with high vibration. However, the air flow meters installed in the compression plant and the blower room have to consider vibration issues. This vibration mainly comes from compressors and blowers.
The vibration of the machine can be transmitted to a long distance through the air duct or duct. Among them, the largest vibration is the reciprocating compressor. The vibration generated during the operation of large reciprocating compressors often drives the workshop and the surrounding ground to vibrate together. It poses a threat to the accurate and reliable operation of related air flow meters. It causes the fulcrum of the lever-type differential pressure transmitter to move and causes the meter to drift in indication. Vibration causes the vortex flow sensor to produce an interference signal corresponding to the vibration frequency, causing the flow indication to be significantly higher.
Gas with water
Compressed air is taken from the atmosphere, and the atmosphere always contains a certain amount of water vapor. The content of water vapor is expressed by the partial pressure of water vapor ps.
In rainy and foggy days, the partial pressure of water vapor in the outdoor atmosphere reaches saturation. That is, the relative humidity reaches 100%. At this time, compressing the atmosphere is like compressing a sponge that absorbs enough water. As the volume shrinks, there is a corresponding amount Water precipitates. This is the simple principle of compressed air with water.
In fine weather, the relative humidity of the atmosphere is low. However, as it is compressed and reduced to a fraction of its original volume, the partial pressure of water vapor will increase accordingly, and it may also enter a saturated state and precipitate water droplets.
Large-caliber orifice flow meters used to measure the flow of compressed air often have water in front of the orifice, which will affect the accuracy of the measurement. There is often a section of water in the impulse pipeline, causing the differential pressure measured by the differential pressure transmitter to be inconsistent with the differential pressure produced by the throttling device. These are common causes of errors caused by water in the air.
In addition, due to the high nitrogen oxide content in the urban atmosphere, the water droplets contained in the compressed air are acidic, causing corrosion on the surface of the annular chamber and corrosion of the inner wall of the pipeline. The surface becomes rough.
When the iron oxide produced by corrosion becomes dry under certain conditions, it is easy to fall off from the inner wall of the pipe and be carried by the airflow to the front of the orifice plate. This will also affect the flow rate indication. Therefore, these powdery and massive garbage should be removed when the flow is stopped for maintenance.
Pulsating flow
Most of the compressor and blower outlet fluids contain certain pulsation. For example, a reciprocating compressor exhibits half-wave pulsation. Observed at the scene that the outlet pressure of the compressor and blower swings significantly.
Among them, the pulsation frequency of the outlet of the positive (constant) displacement blower is relatively high, generally tens of Hz. The pulsation frequency of the outlet of the reciprocating compressor is relatively low, generally a few hertz.
Flow arterial movement causes high indications of various flowmeters such as differential pressure flowmeters and vortex flowmeters. Cause the float in the float flowmeter to jump up and down.
There are two common methods to eliminate and weaken the influence of flow arterial movement on the value of the flow meter.
One is to install a buffer tank at the compressor outlet to filter out pulsation. Instead, install the flowmeter behind the buffer. In fact, the systems of reciprocating compressors are designed in this way.
The second is to install the flowmeter away from the source of pulsation. In this way, the gas capacity of the process pipeline and its pipe resistance can be used to form a low-pass filter to attenuate the pulsation.
Sino-Instt offer over 10 Vortex Compressed Air Flow Meters, with Best Price.
A wide variety of Vortex Compressed Air Flow Meters options are available to you, such as free samples, paid samples. All of our flow meters can wokrk with the AMS NEW TREX.
Sino-Inst is Vortex Compressed Air Flow Meterr suppliers, located in China. Vortex shedding flow meter products are most popular in North America, Mid East, and Eastern Europe.
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.
Vortex flow meter also called Vortex shedding flow meter. Vortex Flow Meter is suitable for flow measurement of steam and various liquids and gases.
What is Vortex Flow Meter?
The vortex flowmeter is a volume flow meter that measures the volume flow of gas, steam, or liquid, the volume flow of standard conditions, or the mass flow of gas, steam, or liquid-based on the Karman vortex principle. When the fluid flows through the dust collector rod of the vortex flowmeter, a vortex is formed. The frequency of vortex shedding is proportional to the fluid velocity. Temperature and pressure compensation can be configured.
Sino-Inst offers a variety of Vortex flow meters for flow measurement. If you have any questions, please contact our sales engineers.
During industrial production, such as metallurgy, coal, electric power, chemical, pharmaceutical, environmental protection and other manufacturing;
Energy measurement. Including the scientific measurement of primary and secondary energy. Such as coal, petroleum gas, natural gas, etc., to achieve energy saving and reduce consumption;
Environmental protection engineering. Including flow measurement of flue gas, sewage, etc.;
Transportation. Including pipeline transportation for control, distribution and scheduling, and better economic accounting through measurement results.
Vortex flowmeter is a speed-type flowmeter produced according to karman’s vortex principle, which can be used for the measurement and measurement of conventional gas, steam and liquid.
Vortex flow sensor has high precision and wide range ratio, no moving parts in use, which can improve mechanical stability and reduce maintenance.Vortex flowmeter is almost not affected by the temperature, pressure and composition of medium when measuring the volume of working condition.
Therefore, it is convenient to calibrate the instrument, so vortex street flow sensor is widely used in production and life.
When a trigonal column vortex generator is set in the fluid, regular vortices are generated alternately on both sides of the vortex generator, which is called Carmen vortex.
The vortex columns are arranged asymmetrically downstream of the vortex generator. Vortex flowmeter is produced according to this principle.
Vortexes are generated by generating bodies and the number of vortexes is detected by high-sensitivity sensors. In a certain range, the number of vortexes generated is proportional to the flow rate.
In vortex flowmeter, the relationship between flow rate and the number of vortexes generated can be expressed by the following formula：
Q：Operating volume flow of the measured medium. The unit is m3/h。 F：Frequency of the number of vortices produced by the generating body. The unit is Hz. K：Refers to the calculated or calibrated flow coefficient. It represents how many frequency signals per cube. the coefficient is usually obtained by calibration.
The formula of standard table method calibration coefficient K:
Endress+Hauser has a great explanation video about vortex flow meter working principle. Let’s take a look!
Vortex flow meter advantages and disadvantages
Advantages of vortex flowmeter
The pressure loss is small, about 1/4 to 1/2 of the throttling differential pressure flowmeter.
Output a pulse signal proportional to the flow rate, without zero drift.
The structure is simple, firm, easy to install and maintain. There is no need for pressure guiding pipe and three-valve group, etc., reducing leakage, blockage and freezing. The measuring element has simple structure, reliable performance and long service life.
The accuracy is high, generally ±(1～1.5)%R.
The measuring range is wide, the vortex flowmeter with a reasonable caliber is determined, and the range can reach 20:1.
Within a certain Reynolds number range, the output frequency of the orifice flowmeter is not affected by the physical properties (density, viscosity) and composition of the fluid, that is, the meter coefficient is only related to the shape and size of the vortex generator and the pipeline.
The volume flow of the vortex flowmeter is not affected by thermal parameters such as the temperature, pressure, density or viscosity of the fluid being measured. Generally, no separate calibration is required. It can measure the flow of liquid, gas or steam.
Disadvantages of vortex flowmeter
(1) The volume flow of the vortex flowmeter is not affected by the temperature, pressure, density and other thermal parameters of the measured fluid, but the final measurement result of liquid or steam should be the mass flow. For gas, the final measurement result Should be the standard volume flow. Both the mass flow rate or the standard volume flow rate must be converted by fluid density, and changes in fluid density caused by changes in fluid working conditions must be considered.
(2) The main factors that cause flow measurement errors are: measurement errors caused by uneven flow velocity of the pipeline; the density of the medium when the fluid working condition changes cannot be accurately determined; the wet saturated steam is assumed to be dry saturated steam for measurement. If these errors are not limited or eliminated, the total measurement error of the vortex flowmeter will be very large.
(3) Poor vibration resistance. External vibration will cause measurement errors of the vortex flowmeter, or even fail to work normally. The high-velocity impact of the channel fluid will cause additional vibration to the cantilever of the vortex generator, which will reduce the measurement accuracy. The influence of large pipe diameter is more obvious.
(4) Poor adaptability to measuring dirty media. The generating body of the vortex flowmeter is very easy to be dirty by the medium or entangled by the dirt, and the change of the geometric body size has a great influence on the measurement accuracy.
(5) High requirements for straight pipe sections. Experts pointed out that the straight pipe section of the vortex flowmeter must ensure the front 40D and the 20D to meet the measurement requirements.
(6) Poor temperature resistance. Vortex flowmeters generally can only measure the fluid flow of media below 300°C.
There are several classification methods of vortex flowmeter as follows.
(1)Classification by detection method
Vortex detection method is the key technology of vortex flowmeter, according to the vortex detection principle and method can be divided into:
Strain vortex flowmeter;
Strain relief vortex flowmeter;
Capacitive vortex flowmeter;
Photoelectric vortex flowmeter;
Thermal vortex flowmeter;
Ultrasonic vortex flowmeter;
Magnetoelectric vortex flowmeter.
(2) According to the sensor structure form classification can be divided into:
Pipe type vortex flowmeter. Generally used for small and medium diameter pipe flow measurement;
Insertion type vortex flowmeter. Mostly used for large-diameter pipeline flow measurement.
(3) According to the use of flowmeter can be divided into:
Explosion-proof vortex flowmeter. Used in petroleum, chemical industry for the instrument explosion-proof requirements of the occasion;
High-temperature vortex flowmeter. For the measurement of high-temperature media;
Ultra-low temperature type vortex flowmeter. Used for liquid nitrogen, liquid oxygen, and other ultra-low temperature medium measurement;
Corrosion-resistant vortex flowmeter. Used for acid, alkali, salt, and other corrosive media measurement;
Mass type vortex flowmeter. Used for the measurement of fluid quality.
(4)According to the function of the instrument can be divided into:
Conventional vortex flowmeter;
Intelligent street flowmeter. Can be signal detection, processing, compensation operation, display, output in one.
Vortex flow meter has certain requirements on the upstream and downstream straight pipe section of the installation point, otherwise it will affect the flow field of medium in the pipeline and affect the measuring accuracy of the meter. The length of the upstream and downstream straight pipe section of the instrument is required as shown in FIG. DN is the nominal diameter unit of the instrument :mm.
Vortex flow meter pressure drop
Calculate whether the pressure loss has an impact on the process pipeline, calculated by the following formula:
DP=1.2r × V2(Pa)
Where: DP: Pressure loss (Pa) r: density of medium (Kg/m3) V: Average flow velocity in the pipe (m/s)
When the measured medium is liquid, in order to prevent vaporization and cavitation, the liquid pressure of the sensor should meet the requirements of the following formula: P≥2.6DP + 1.25P1 (Pa absolute pressure)
Where: DP: pressure loss value (Pa) P1: The vapor pressure of the fluid (Pa absolute pressure)
What are vortex flow meters used for?
Vortex flowmeter is mainly used for industrial pipeline medium fluid flow measurement. Such as gas, liquid, vapor and other media. Here are some related applications.
Price is always a topic of concern. Different types of vortex flowmeters can be found online, and the prices of different vortex flowmeter manufacturers are not consistent. The final quotation is still subject to the actual working conditions on site.
Vortex flow meters have different prices due to different calibers, different materials, different media, and different functions! The price list of vortex flowmeter is attached below for reference.
This is a reference price only. Not the price of the order transaction. Please contact our sales engineers. According to the measurement conditions, choose the appropriate model to confirm the price.
Full-tube piezoelectric vortex flow sensor (Including special flanges, bolts, and nuts)
Sino-Inst, Manufacturer for Vortex Flow Meters, like gas vortex flow meter, liquid vortex flow meter, sanitary vortex flow meter, insertion vortex flow meter, steam vortex flow meter, and natural gas vortex flow meter.
Sino-Inst’s vortex Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
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.
Turbine Pulse Flow Meter refers to a turbine flow meter that can be configured with pulse output. DN4~DN300, 304 stainlees steel, 316 stainlees steel, PE materials are available. It is widely used in measuring the flow of various liquids, including water, aqueous solution, hydraulic oil, etc.
The turbine flowmeter outputs pulse signal is used to detect the instantaneous flow rate and the total integrated flow rate. And is suitable for use with computer control systems such as secondary displays, PLCs, and DCS.
Turbine Pulse Flow Meter is a low-cost flow meter, reference price: USD 300-700/pc.
Sino-Inst offers a variety of Turbine flow meters for flow measurement. If you have any questions, please contact our sales engineers.
Good repeatability. Short-term repeatability can reach 0.05%~0.2%;
Output pulse frequency signal. Suitable for total measurement and connection with computer. No zero drift, strong anti-interference ability;
High frequency signals (3~4kHz) can be obtained, with strong signal resolution;
Wide range. Medium and large diameters can reach 1:20. Small diameters are 1:10;
Compact and lightweight structure. Easy installation and maintenance, large circulation capacity;
Suitable for high-pressure measurement. No holes are required on the meter body. It is easy to make high-pressure meters;
There are many types of special sensors. Various special sensors can be designed according to the special needs of users. Such as low temperature type, two-way type, downhole type, etc.;
It can be made into a plug-in type, suitable for large-caliber measurement. The pressure loss is small, the price is low. It can be taken out continuously, and the installation and maintenance are convenient.
When the fluid flows through the sensor housing, since the blades of the impeller are at a certain angle to the flow direction, the impulse of the fluid causes the blades to have a rotational torque. After overcoming the friction torque and fluid resistance, the blades rotate. After the torque is balanced, the rotational speed becomes stable.
Under certain conditions, the rotational speed is proportional to the flow rate.
Since the blade is magnetically permeable, it is in the magnetic field of the signal detector (composed of permanent magnet steel and a coil). The rotating blade cuts the magnetic lines of force, periodically changing the magnetic flux of the coil. This causes an electrical pulse signal to be induced at both ends of the coil. This signal is shaped by the amplifier to form a continuous rectangular pulse wave with a certain amplitude. It can be remotely transmitted to the display instrument to display the instantaneous flow rate or cumulative total volume of the fluid.
Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow rate Q of the fluid flowing through the sensor. The flow equation is:
Q=3600*f/k
In the formula: f—Pulse frequency [Hz] K-sensor instrument coefficient [1/m3], given by the calibration sheet. Q-instantaneous flow rate of fluid (under working condition) [m3/h] 3600-conversion factor
The instrument coefficient of each sensor is filled in the calibration certificate by the manufacturer. The K value is set into the matching instrument. The instantaneous flow and cumulative total can be displayed.
FAQ
A pulse flow meter operates by converting the flow rate into a series of electrical pulses. Typically, as the fluid flows through the meter, a mechanical or electronic component will generate pulses. The frequency of these pulses is directly proportional to the flow rate. The generated pulses are then counted and processed by an electronic system to display or record the flow rate. The principle is akin to turning the pages of a book – the faster you turn, the more pages (or pulses) you go through in a given time.
Pulse flow meters are versatile and can be used in various applications, from water distribution to chemical processing.
Yes, a turbine flow meter is specifically designed to measure the flow rate of a fluid. As the fluid passes through the meter, it impinges on the blades of a freely rotating turbine. The speed of the turbine’s rotation is directly proportional to the flow rate. By measuring the rotational speed, the flow rate can be determined.
Turbine meters are commonly used in hydrocarbon industries and are suitable for clean, low-viscosity fluids.
A turbine flow meter is a type of flow measurement device that uses a rotating turbine or impeller to measure the velocity of a fluid. As the fluid flows through the meter’s body, it causes the turbine to rotate. The rotation speed of the turbine is then directly related to the fluid velocity, allowing the flow rate to be calculated. The rotational speed is typically detected using magnetic or optical sensors.
Turbine flow meters have been in use for decades and are recognized by industry standards for their reliability in certain applications.
Turbine flow meters are generally accurate for specific applications, especially when measuring clean and low-viscosity liquids. Their accuracy can range from ±0.5% to ±1.5% of reading, depending on the make and model. However, their performance can be affected by fluid properties, wear and tear of the turbine blades, and the presence of impurities in the fluid.
Trustworthiness Note: For the best results, it’s essential to calibrate turbine flow meters regularly and ensure they are used within the recommended flow range and conditions.
Pulse Output Flow Meter
Pulse flowmeter refers to a type of flowmeter that can express flow in pulse form. The most common one is turbine flowmeter.
A turbine is placed in the center of the pipeline, and the two ends are supported by bearings. When the fluid passes through the pipeline, it impacts the turbine blades. The driving torque is generated to the turbine, so that the turbine overcomes the friction torque and the fluid resistance torque to generate rotation.
Within a certain flow range, for a certain fluid medium viscosity, the rotational angular velocity of the turbine is directly proportional to the fluid flow velocity. Thus, the fluid velocity can be obtained by the rotational angular velocity of the turbine. The fluid flow through the pipeline can be calculated.
The speed of the turbine is detected by a sensor coil installed outside the casing.
When the turbine blade cuts the magnetic field lines generated by the permanent magnet steel in the casing, it will cause the magnetic flux in the sensing coil to change. The sensing coil sends the detected magnetic flux periodic change signal to the preamplifier, amplifies and reshapes the signal, and generates a pulse signal proportional to the flow rate. It is sent to the unit conversion and flow integration circuit to obtain and display the cumulative flow value. At the same time, the pulse signal is sent to the frequency current conversion circuit. The pulse signal is converted into an analog current quantity, and then the instantaneous flow value is indicated.
The signal output by the flowmeter is generally a pulse signal or a 4-20mA current signal. Both of these signals output instantaneous flow. There is also a relay to output a cumulative signal. The principle is the same, so I will not repeat it.
Our purpose is to calculate and display the instantaneous flow value and calculate the cumulative value in the PLC. When the input signal is a pulse signal, when calculating the instantaneous flow, a strict time interval must be calculated to ensure the accuracy of the instantaneous flow.
Therefore, when calculating the instantaneous flow rate, a timed interrupt must be used.
Moreover, only this interrupt program can be run in the PLC system, and no other interrupts are allowed. Even low priority interrupts are not allowed to run. To prevent interference with the accuracy of the timing interruption interval. To calculate the instantaneous flow is to convert the number of accumulated pulses in this time period into the accumulated flow. Divided by time is the instantaneous flow.
For 4-20mA input, the instantaneous flow can be directly obtained by simply converting according to its corresponding range. The cumulative flow is the cumulative flow by adding up the cumulative flow in each time period. The following issues must be paid attention to in the actual use of PLC programming:
Whether the input pulse frequency range exceeds the range that the PLC receives;
How to ensure the correct calculation of the PLC high-speed counter when it reaches the maximum count value;
How to ensure that the timing interruption is not disturbed;
How to avoid errors in calculating the cumulative amount;
The maximum cumulative digits of the cumulative amount;
Sino-Inst’s Turbine Pulse Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
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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.
Turbine flow meters are velocity flow meters, also called impeller flow meters. Can be used to measure the instantaneous flow and cumulative flow of liquids and gases.
Turbine flowmeters are widely used in flow measurement: petroleum, organic liquids, inorganic liquids, liquefied gas, natural gas, coal gas and cryogenic fluids. Turbine flowmeter signals can be divided into pulse signals or current signals (4-20mA). It is suitable for use with secondary display, PLC, DCS and other computer control systems.
High accuracy, good repeatability, low pressure loss, good vibration resistance;
Adopt high-quality bearings with low friction resistance. Good sealing and long life;
It integrates microprocessor, flow sensor, high-precision temperature and pressure sensor. Directly measure the flow, temperature and pressure of the gas/liquid being measured. And automatically perform flow tracking compensation and compression factor correction operations;
The meter has pulse signal and analog signal output. It can directly realize the centralized collection and real-time management of computer data through the RS485 communication interface or the GPRS system;
Low power consumption. It can be powered by internal battery or external power supply;
With real-time data storage function. It can prevent data loss when the battery is replaced or the power is suddenly lost. In the case of power failure, internal data can be stored permanently;
It can be used in conjunction with IC card prepayment system to facilitate trade settlement;
Turbine Flow Meter Working Principle
Gas turbine flow meter working principle
The gas turbine flowmeter uses a turbine for measurement. It first converts the flow rate into the rotational speed of the turbine, and then converts the rotational speed into an electrical signal proportional to the flow rate.
Gas turbine flowmeter is used to detect instantaneous flow and total integrated flow. Its output signal is frequency, which is easy to digitize.
The induction coil and the permanent magnet are fixed on the housing together. When the ferromagnetic turbine blade passes the magnet, the reluctance of the magnetic circuit changes, thereby generating an induction signal.
The signal is amplified and reshaped by the amplifier and sent to the counter or frequency meter. The total accumulated flow is displayed. At the same time, the pulse frequency undergoes frequency-voltage conversion to indicate instantaneous flow.
The speed of the impeller is proportional to the flow, and the number of revolutions of the impeller is proportional to the total amount of flow. The output of the turbine flowmeter is a frequency modulated signal. It not only improves the anti-interference of the detection circuit, but also simplifies the flow detection system.
The gas turbine flowmeter has a turndown ratio of up to 10:1, and the accuracy is within ±0.2%. The time constant of the turbine flowmeter with small inertia and small size can reach 0.01 second.
Liquid Turbine Flow Meter is a speed type flow meter based on the principle of torque balance.
The fluid flows through the sensor housing. Because the blades of the impeller have a certain angle with the flow direction. The impulse of the fluid makes the blades have a rotational torque. After the friction torque and fluid resistance are overcome, the blades rotate. The speed is stable after the torque is balanced.
Under certain conditions, the speed is proportional to the flow rate.
Due to the magnetic permeability of the blade, it is in the magnetic field of the signal detector (composed of permanent magnets and coils). The rotating blade cuts the magnetic lines of force. The magnetic flux of the coil is periodically changed. Electrical pulse signals are induced at both ends of the coil.
This signal is amplified and reshaped by an amplifier. A continuous rectangular pulse wave with a certain amplitude is formed. It can be transmitted to the display instrument remotely. The instantaneous flow or total amount of the fluid is displayed.
Within a certain flow range, the pulse frequency f is proportional to the instantaneous flow Q of the fluid flowing through the sensor. The flow equation is:
Where: f——Pulse frequency [Hz] k——The meter coefficient of the sensor [1/m3], which is given by the calibration sheet. Q——The instantaneous flow of fluid (under working condition) [m3/h] 3600-conversion factor in seconds
The meter coefficient of each sensor is filled in the verification certificate by the manufacturer. The k value is set in the matching display instrument. The instantaneous flow and cumulative total can be displayed.
An oil and Gas Flow Meter is A device installed in a pump manifold or treating line to measure the…
Sino-Inst, Manufacuturer for Turbine Flow Meters, like: gas turbine flow meter, liquid turbine flow meter, sanitary turbine flow meter, insertion turbine flow meter, steam turbine flow meter, and natural gas turbine flow meter.
Sino-Inst’s Turbine Flow Meters, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, US, and other countries.
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.
