What Is an Air Pressure Transducer?

Posted on June 8, 2021 by KimGuo11

An Air pressure transducer is a sensor that converts the mechanical signal of air pressure into a current signal. Pressure has a linear relationship with voltage or current, and it is generally proportional. Therefore, the output voltage or current of the transmitter increases as the pressure increases. From this, a relationship between pressure and voltage or current is derived.

RFQ More Pressure Sensor

Featured air pressure transducers

**SI-300 Pressure Transducer 4-20mA/Voltage**
The 4-20mA/ Voltage Pressure Transducer,
also called pressure transmitter 4-20mA,
is a pressure sensor with4-20ma/Voltage output.

**SI-390 Industrial Pressure Transmitter**
Pressure transmitters for general industrial applicaitons. -0.1kPa ~ 0 ~ 0.01kPa ~ 100MPa ~150MPa. 0.1% FS, 0.25% FS, 0.5% FS. 4-20mA (2-wire system), 0-5 / 1-5 / 0-10V (3-wire

**SI-503K Gas Pressure Sensor**
Gas pressure sensor for industrial gas pressure monitoring. Pagoda gas nozzle Φ8. Such sensors are also commonly referred to as wind pressure transmitters, exhaust pressure sensors.

**SI-702 High Pressure Sensor**
High pressure sensor is pressure transmitter designed for high pressure measure&control. 0 ～ 40MPa… 600MPa. M20 × 1.5, G1 / 2 (others are customized according to requirements)

**SI-702S Ultra-High Pressure Senors**
Pressure sensor for Ultra high pressure applications. Ultra high pressures up to 15,00MPa. 0-2000MPa to 0-7000MPa (customized).Ball head M20 × 1.5, cone head M20 × 1.5.

**SI-512H High Temperature Pressure Sensor**
High Temperature Pressure Sensor for pressure measurement of high temperature gas or liquid. Such as steam pressure. High temperature up to 800 ℃.

**SIJC-1000HSM-Silicon Pressure Sensor**
Silicon pressure sensor, also known as Diffused silicon pressure sensor. Silicon pressure sensors are low cost.

**SI-706 Combined Pressure and Temperature Sensor-Dual function**
Combined pressure and temperature sensor for Simultaneous measurement of pressure and temperature.
Thermocouple types: J, K, E type or PT100 platinum resistance. Two outputs do not affect each other.

**Absolute Pressure Transmitter**
Absolute pressure transmitter with 4-20mA output for measuring pressure with absolute type reference. Absolute pressure (AP) transmitter is a measure of the ideal (complete) vacuum pressure.

**Hydrostatic pressure transmitter**
Hydrostatic pressure transmitter is used for fluid hydrostatic pressure measurement. With working static pressure up to 32Mpa, for liquid, gas or steam .

Pressure transducer is a high-precision instrument that can perform on-site inspection of pressure parameters, and is widely used in industrial measurement and control processes. It can be used to measure the pressure, differential pressure and absolute pressure of various media such as liquid, gas and steam. Then the pressure signal is converted into 4-20mADC signal output to supply secondary instruments such as indicating alarm, recorder, regulator, etc. for measurement, indication and process adjustment.

Extended reading: extrusion melt pressure transducer

The functional principle of a resistive pressure transmitter is very simple. The pressure sensor converts the mechanical pressure value into a proportional electrical signal. The pressure sensor typically consists of a stable main body and a (thin) diaphragm.

The diaphragm is the most important element for the measurement of pressure and is equipped with strain-sensitive and compression-sensitive resistance structures, so-called strain gauges (DMS). The diaphragm is deflected under the influence of pressure.

Thus, the strain gauges attached to it are elongated or compressed and its electrical resistance changes. This change in resistance is directly proportional to the pressure. For example, if the resistors are wired to a Wheatstone measuring bridge, the resulting electrical signal can be measured and transferred to an indicator.

Extended reading: Pressure indicator transmitters

There are different types of pressure transducers based on their design.

These sensors can come in several shapes and sizes, but the technology inside can also differ.

There 4 main types of pressure sensors based on this:

Strain Gauge Pressure Transducers
Capacitance Pressure Transducers
Potentiometric Pressure Transducers
Resonant Wire Pressure Transducers

More about Industrial Pressure Sensors

Extended Reading: Electronic Pressure Switch for Air Compressor

The terms pressure sensor, pressure transducer and pressure transmitter are often used interchangeably. We usually define relevant measurement parameters and output signals to distinguish products.

Of course, if you want to strictly distinguish these three words from a technical point of view, you can refer to the following brief introduction:

PRESSURE SENSOR

Millivolt (mV) output signal (also a general term for all pressure types); a device that measures pressure.

The millivolt output signal can typically be used ten (10) to (20) feet away from the electronics without significant signal loss. The signal is proportional to the supply. A 5VDC supply with a 10mV/V output signal produces a 0-50mV output signal.

Older technologies such as bonded foil strain gage or thin film technology produce 2-3mV/V (millivolts per volt), whereas MEMS technology can produce 20mV/V reliably.

Millivolt output signals give the design engineer the flexibility to condition the output signal as their system needs it and can reduce package size and cost.

Extended Reading: 4-20ma pressure transducer wiring diagram

PRESSURE TRANSDUCER

High level voltage or frequency output signal including 0.5 to 4.5V ratiometric (output signal is proportional to the supply), 1-5V and 1-6kHz. These output signals should be used within twenty (20) feet of the electronics.

Voltage output signals can offer low current consumption for remote battery operated equipment such as wellhead SCADA systems.

Supply voltages are typically from 8-28VDC, except for the 0.5-4.5V output, which requires a 5VDC regulated supply.

Older voltage output signals, such as 0-5V, do not have a “live zero” where there is signal when the sensor is at zero pressure. The risk is that the system does not know the difference between a failed sensor with no output and zero pressure.

Extended Reading: Smart pressure transmitter

PRESSURE TRANSMITTER

Current output signal, i.e. 4-20mA (4 to 20mA), the current, rather than the voltage, is measured on the device, rather than the voltage; Sino-Inst pressure transmitters are two wire devices (red for supply, black for the ground).

4-20mA pressure transmitters offer good electrical noise immunity (EMI/RFI), and will need a power supply of 8-28VDC. Because the signal is producing current, it can consume more battery life if operating at full pressure.

Extended reading: Pressure Sensor Applications In Various Industries

Pressure Transducer is a device or device that can sense the pressure signal and convert the pressure signal into a usable output electrical signal according to a certain law. Pressure sensors are usually composed of pressure sensitive elements and signal processing units. According to different test pressure types, pressure sensors can be divided into gauge pressure sensors, differential pressure sensors and absolute pressure sensors.

Pressure sensor is the most commonly used sensor in industrial practice. It is widely used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electric power, ships, machine tools , pipeline and many other industries, the following briefly introduces some common sensor principles and their applications. Another medical pressure sensor.

Our pressure transmitters can also be upgraded to Low power-battery powered Wireless Pressure Sensors.

The pressure switch adopts high-precision, high-stability pressure sensor and transmission circuit, and then uses the CPU modular signal processing technology to realize the detection, display, alarm and control signal output of the medium pressure signal.

Pressure switches can be widely used in petroleum, chemical, metallurgy, electric power, water supply and other fields to measure and control the gauge pressure and absolute pressure of various gases and liquids. It is an ideal intelligent measurement and control instrument for industrial sites. Pressure switches are widely used in aerospace and military fields, such as M1A1 tanks, Apollo spacecraft, Boeing 747, Airbus A320, F22, F117 and other product manufacturing.

A pressure switch is not the same as a pressure sensor:

(1) The pressure sensor is composed of a pressure-sensitive element and a conversion circuit. It uses the pressure of the measured medium to impregnate the pressure-sensitive element to produce a small changing current or voltage output.
(2) The pressure switch is a utility switch that automatically turns on or off when the set value is reached.

Extended Reading: strain gauge pressure transducer

What is the difference between a pressure switch and a pressure sensor

Difference in function

(1) As the name suggests, the pressure switch is a switch. It is just that the pressure is set in advance. When the measured medium reaches this pressure, the switch can be turned on or off automatically. The pressure switch must be given a pressure value in advance, and then open or close the switch. It is used for simple control, and it is all switching output.

(2) The pressure sensor can not only output analog signals, but also output digital signals. Digital signal processing is more convenient, and it can also be transmitted remotely. The pressure sensor is composed of a pressure-sensitive element and a conversion circuit. The pressure of the measured medium acts on the pressure-sensitive element to generate a small change of current or voltage output.

Price difference

The pressure sensor is naturally much more expensive than the pressure switch. Because the pressure sensor has an internal signal conditioning circuit. Considering the service life and safety, the pressure sensor is much more cost-effective than the pressure switch. The after-sales service, product reputation, The market difference is better than the pressure switch. Obviously, the pressure sensor is still the priority.

Differences in the mode of action

(1) The sensor often needs to be used in conjunction with an external amplifier circuit to complete the process from pressure detection to control and display. Since the pressure sensor is a primary component, the signal fed back by the pressure sensor needs to be processed, analyzed, stored, and controlled through the measurement and control system, so that industrial automation equipment and project operation control are more intelligent.

(2) The pressure switch does not need other cooperation. When the pressure is sensed, it can complete the work independently.

Extended reading: How to calibrate HART pressure transmitters

Air pressure transducer selection:

Measuring range (range)
The output signal, communication protocol, whether with display meter
Process interface (general, please provide thread specifications, flange type, provide specific flange standard, flange size, capillary length, process medium temperature, and other information)
Electrical interface
Installation method (horizontal installation or vertical installation)
Mounting bracket (flat bracket or L-shaped bracket, bracket material requirement: carbon steel or stainless steel)
Other requirements (explosion-proof, explosion-proof, lightning arrester, water, and oil prohibition treatment, etc.)

Tools for converting and calculating pressure values

Absolute pressure-Gauge pressure Converter	Pressure Unit Converter	Liquid Depth/Level to Hydrostatic Pressure Calculator
Differential Pressure Calculator	Pressure Transducer 4-20ma Output Calculator	Pressure to Liquid Level Calculator

More Pressure Measurement Products

**SI2088-W Wireless Pressure Transmitter**

**SI-1110 Wireless Pressure Transducer**

**Differential pressure(DP) level transmitter**

**Flange Mounted Differential Pressure Transmitter**

**Extended Diaphragm Seal DP Level Transmitter**

**Remote Seal Differential Pressure Transmitter**

**SI-PCM260 Deep Well Water Level Sensor**

**SI-302 Anti-corrosive Submersible Level Transmitter**

Frequently
Asked
Questions

Help Center

Here we briefly introduce the use of some pressure transmitters;

It is directly used for the measurement of various pressures: air pressure, water pressure, hydraulic pressure (including water pressure), various blood pressure measurement of people in life, etc.;
Pressure sensors are used in automobiles, some high-end motorcycles and almost all internal combustion engines;
Liquid level meter: Most of the field meters used for various liquid level measurement are also pressure sensors;
The source of the weighing signal of most electronic weighing scales and truck scales is also the pressure sensor.
Pressure sensors are also used for acceleration measurement in aviation and aerospace.

There are many others, too many to list.

There are two measurement methods:

Pass the current test of the multimeter, the steps are as follows:

The red test lead of the multimeter is connected to the hole of mA, and the black test lead is connected to COM.
Adjust the gear of the multimeter to the DC mA gear.
The red test lead of the multimeter is connected to the positive pole of the 4-20mA sensor output, and the black test lead is connected to the negative pole of the 4-20mA sensor output.
Read the reading from the display area of the multimeter, and the reading is the current value.

Through the multimeter’s 10,000-voltage range measurement, for the multimeter without the current test function, the current value can be measured by the voltage, and the steps are as follows:

At the output of the 4-20mA sensor, connect a sampling resistor of about 100 ohms.
The red test lead of the multimeter is connected to the hole of mA, and the black test lead is connected to COM.
Adjust the gear of the multimeter to DC V gear.
The red test lead of the multimeter is connected to the positive pole of the 4-20mA sensor output, and the black test lead is connected to the negative pole of the 4-20mA sensor output.
Read the reading from the display area of the multimeter, the reading is the voltage value, and the current value can be obtained by dividing the reading reading by the resistance value (such as 100 ohms).

Use the DC current function of the multimeter, 20mA gear (if not, choose 100mA gear), and you can directly test the sensor output. If it is a desktop digital multimeter, you can also use any sensor function to allow the instrument to directly test the physical quantity sensed by your sensor. Wiring method: red test lead to green wire, black test lead to yellow wire

The basic principle of the differential pressure transmitter is to divide a space with a sensitive element (multi-purpose bellows) into two chambers. When pressure is introduced into the two chambers, respectively, the sensor produces displacement (or a tendency to displace) under the combined action of the two pressures. This displacement is proportional to the pressure difference (differential pressure) between the two chambers. Convert this displacement into a standard signal output that can reflect the magnitude of the differential pressure.

Potentiometer-based calibration
Some pressure sensors have screws for zero adjustment, span adjustment, or both. Turning these screws will adjust the low end output (zero adjustment) or the high end output (span adjustment).

Typically, these screws are located on the PCB inside the sensor body. If you want to adjust the output, you need to follow these steps:

Turn on the sensor without disconnecting the PCB output port.
Accurately apply zero and full scale pressure to the sensor. (A minimum ±0.1% full scale accuracy of applied pressure is recommended.)
Connect the sensor to appropriate power and monitoring equipment to verify the output of the pressure sensor.
Adjust the zero output first, then adjust the full scale output.
Tools such as DC power supply, multimeter, pressure comparator are required.

Electromagnetic based calibration
Instead of using potentiometers, some pressure sensors use magnets for decay. Magnet-based calibration comes in two flavors: magnet and shunt calibration (often called shunt calibration).

A small magnet is usually placed near the top or bottom of the pressure sensor to increase or decrease (respectively) the zero output of the pressure sensor. Generally speaking, the full-scale output of this type of sensor can usually only be adjusted by the factory. If you want to adjust, you need to follow the steps below:

Precisely apply zero pressure to the sensor. (We recommend a full-scale accuracy of at least ±0.1% of applied pressure.)
Connect the sensor to appropriate power and monitoring equipment to verify sensor output.
To turn down the zero output, hold the magnet perpendicular to the lower end of the device.
To turn up the zero output, hold the magnet perpendicular to the upper end of the device.
If the zero output is 0 (eg, 0 VDC, 0 mV, etc.), the magnet adjustment of the zero output can be a bit of a hassle. When the zero output is non-zero, on a 1-5 VDC sensor, the actual value is less than the zero output (0.995 VDC, 0.85 VDC), so you can tell when the value is adjusted too far and the output needs to be restored. When the zero output is 0, there is no that extra buffer below the zero output and can be adjusted to a value that can only be pulled back by the factory.

Calibration with software
It should be easy to adjust the zero and full scale outputs for sensors connected to monitoring software. For example, software that controls a 4-20 mA sensor might have a 4 mA calibration setting and a 20 mA calibration setting. In this way, software control does what shunt calibration and previous calibration techniques do: it adjusts the sensor’s output, as well as controls the device’s reading of the output.

To calibrate a software-controlled sensor, follow these steps:

Connect the sensor to the control software
Accurately apply zero and full scale pressure to the sensor. (A minimum ±0.1% full scale accuracy of applied pressure is recommended.)
Using the software, adjust the zero and full scale output calibration variables until the corresponding output from the sensor is correct.

Pressure sensors are generally divided into two-wire, three-wire, four-wire, and some five-wire systems.

The two-wire system of the pressure sensor is relatively simple, and ordinary users know how to wire it. One is connected to the positive pole of the power supply, and the other wire is connected to the negative pole of the power supply through the meter. This is the simplest.

The three-wire pressure sensor is to add a line on the basis of the two-wire system. This line is directly connected to the negative pole of the power supply, which is more troublesome.

The four-wire pressure sensor has two power input terminals. The other two are signal output terminals. Most of the four-wire systems are voltage outputs. Instead of 4~20mA output. 4~20mA is called pressure transmitter, most of which are two-wire system.

The signal output portion of the pressure sensor is not amplified. The full-scale output is only tens of millivolts. Some sensors have an internal amplifier circuit, and the full-scale output is 0~2V.

For how to connect the display meter, it depends on the range of the meter. If there is a gear suitable for the output signal, you can measure it directly. Otherwise, you need to add a signal conditioning circuit. The five-wire pressure sensor is different from the four-wire type, and there are fewer five-wire pressure sensors on the market.

Read more about: What Is 0-10V Signal Output?

Steam Pressure Transmitter

Posted on June 7, 2021 by KimGuo11

Steam pressure transmitters are widely used in the measurement and control of various high-temperature steam piping systems. The monitoring of steam pipes is very important. To measure the pressure of steam pipes, have you encountered the following problems:

Don’t know which pressure transmitter to choose?
Is it good to use a high-temperature pressure transmitter to measure the pressure of the steam pipe?
The core of the pressure transmitter removed at the steam site. The diaphragm has been dented by the impact. Is it scrapped directly?
How to choose the type and what should be paid attention to when measuring the steam pipeline?

RFQ More Pressure Sensors

Steam pressure transmitter performance

The tested medium is widely used. It can test steam, oil, water, and pastes compatible with 316 stainless steel and 304 stainless steel. It has a certain anti-corrosion ability.
High accuracy, high stability, use imported original sensors. Good linearity. High temperature resistance and high stability.
Small size, light weight, easy to install, debug and use
Stainless steel fully enclosed shell, good waterproof.
The pressure transmitter directly senses the pressure of the measured liquid level and is not affected by the bubbling and deposition of the medium.
The overall performance in the industrial field is ±0.15%, so that the loop performance is optimized
Five-year stability ±0.15%, which can greatly reduce the cost of calibration and maintenance
Faster dynamic response reduces process variability
The introduction of technology can realize a comprehensive measurement plan
Local/external: zero/range adjustable

Extended Reading: Smart pressure transmitter

Related Products:

**High Frequency Dynamic Pressure Sensor**

**SI-350 Sanitary Pressure Transmitter**

Extended reading: Featured Diaphragm Seal Pressure Transmitters

Steam pressure transmitter installation

When wiring, pass the cable through the waterproof connector (accessory) or flexible tube and tighten the sealing nut to prevent rainwater from leaking into the transmitter housing through the cable.
Prevent the pressure transmitter from contacting corrosive or overheated media;
When measuring the liquid pressure, the installation position of the transmitter should avoid the impact of the liquid (water hammer phenomenon) to avoid damage to the sensor overpressure;
When measuring the liquid pressure, the pressure port should be opened on the side of the processing pipeline to avoid precipitation and slag;
When measuring gas pressure, the pressure tap should be opened at the top of the process pipeline. The transmitter should also be installed on the upper part of the processing pipeline. So that the accumulated liquid can be easily injected into the processing pipeline;
Prevent dross from depositing in the duct;
When measuring steam or other high-temperature media, a buffer tube (coil) and other condensers should be connected. The working temperature of the pressure transmitter should not exceed the limit;
When freezing occurs in winter, the transmitter installed outdoors must take anti-freezing measures. Avoid volume expansion of the liquid in the pressure inlet due to icing, leading to damage to the sensor;
The pressure guiding tube should be installed in a place with small temperature fluctuations;

Read more about: What is a pressure sensor and how it works?

What should be paid attention to when measuring the pressure on the steam pipeline?

Pressure transmitters are used for steam metering and pipeline monitoring.

The temperature in the steam pipeline is generally relatively high. The low is more than one hundred degrees Celsius, and the high is two to three hundred degrees Celsius.

The start and stop of the valve will also cause the pressure in the pipeline to fluctuate.

Today we are going to talk to you about what to pay attention to when measuring the pressure of steam pipes?

When measuring the pressure of the steam pipeline, a high-temperature pressure transmitter should be selected due to the high-temperature environment.

In fact, in steam conditions, it only needs to pass through the surface bend (condensation tube). After passing through the elbow, the steam will condense into water at the elbow. Insulate the temperature, so as to achieve a good cooling effect.

The pressure transmitter after passing through the elbow on the pipeline with insulation layer is basically at room temperature. If it is not insulated, the high temperature will rise, causing the temperature of all objects above the pipeline to rise.

Advantages: The use of bends can optimize the cost, and is compatible with the product.

The material selection of a good bend is high. It is thicker and more durable than the general watch bend on the market. Good pressure resistance. The price will be slightly more expensive.

Extended Reading: FMCW Radar for High Temperature Level Sensor

The above-mentioned pressure transmitter diaphragm damage is due to the phenomenon of water hammer.

The valve suddenly opens or closes, causing the pressure in the steam pipe to fluctuate suddenly.

Especially when the valve is opened, huge pressure fluctuations will cause the pipeline to vibrate violently. Even shocking.

The pressure transmitter will also withstand huge pressure in the pipeline. In severe cases, the core may be dented or even burst.

The prevention method is to install safety valves and accumulators, and open and close the valves slowly. Install a trap at the high point of the air discharge valve at the low point.

Some pressure transmitters will be protected by dampers and baffles.

The damper is a copper piece with a 4mm outer wire and a T-shaped thin through-tube structure inside. It can prevent the medium from directly impacting the diaphragm.

The baffle is placed on the front end of the core before assembling the core. Metal plate with holes. It also prevents the medium from directly impacting the diaphragm.

In the hydraulic machinery industry, there are a lot of equipment for pressure transmitters, which are often used for pressure control.

But hydraulic machinery is very prone to pressure shock when it is working. The shock pressure will far exceed the normal pressure, causing damage to the pressure transmitter.

In this case, some pressure transmitters have internal wires and dampers in the standard pressure port. Can effectively alleviate the impact.

The hydraulic and mechanical pressures are all above 10MPa. Generally, the transmitter above 10MPa should be equipped with a damper as standard. If the pressure shock is severe, a baffle can be added to alleviate the shock.

Extended Reading: Electronic Pressure Switch for Air Compressor

Extended Reading: Up to 800°C High Temperature Pressure Sensor

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Sino-Inst offers over 10 Steam Pressure Transmitters. A wide variety of Steam Pressure Transmitter options are available to you. Such as free samples, paid samples.

Sino-Inst is a globally recognized manufacturer of Steam Pressure Transmitters, located in China. Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Steam Pressure Transmitter products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting certified suppliers. With ISO9001, ISO14001 certification.

KimGuo11

drurylandetheatre.com

How does a residential water meter work?

Posted on June 6, 2021 by KimGuo11

What does a residential water meter look like?

A residential water meter is a legal meter for measuring water consumption in residential communities, residential buildings, bungalows, and other places.

What are the commonly used residential water meters? In terms of functions, there are smart IC card water meters, remote water meters, and smart valve-controlled water meters. Below, we will briefly introduce these common and commonly used residential water meters!

RFQ

More meters

Residential Water Meters Types

The types of water meters can be divided by the principle of measurement. The common types are mechanic water meters, mechanical water meters equipped with electronic devices, and electronic water meters.

Their working principles are as follows:

Measuring sensors, calculators, and indicating devices are all water meters with mechanical principles and structures. There are mainly speed water meters and volumetric water meters.

Extended reading: Industrial VS Residential inline water flow meters

Keep a mechanical water meter with a complete structure. On this basis, a water meter with an electronic device is installed. There are mainly IC card water meters and remote water meters. The measuring sensor of the mechanical sensor electronic water meter is composed of a sensor based on the principle of mechanical motion and a sensor element that can convert the mechanical motion into an electrical signal and input it into the calculator. Both the calculator and the indicating device are electronic components. Such as vortex (impeller) wheel type electronic water meter.

Extended Reading: 3 inch (3″) Water Meter

Electronic water meters are divided into mechanical sensor electronic water meters and electronic sensor electronic water meters. The measuring sensor of the electronic water meter is based on the principle of electronic or electromagnetic induction. Both the calculator and the indicating device are electronic components. Such as ultrasonic water meter, jet water meter, Coriolis water meter, and electromagnetic water meter.

Extended reading: Advantages and disadvantages of ultrasonic water meters

Read More about: Chemical Flow Meter Guide

Related Products

**Ultrasonic Water Meter for Residential Water**

**Insertion Ultrasonic Water Flow Meter**

**Rotameter flow meter-Variable Area Flow Meters**

Extended Reading: LORA water meter

Where is the Residential water meter installed?

In order to be beautiful and save space, water meters are generally installed in their own kitchens. Some of them will be installed in the corner of the kitchen or covered by other kitchen furniture.

However, in order to facilitate the reading of the water meter, it is best to install the water meter in a conspicuous position.

If the house has a special type, it may be installed outdoors.

Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

Precautions for installation of Residential water meter

If it is to install a water meter on a new pipeline. You have to rinse all the stolen goods in the pipeline first. This will prevent the water meter from slowing down or not moving in the later stage.
It is better to install a filter before the water meter is installed. Before installing other instruments in the pipeline, the debris in the pipeline should be cleaned up. Avoid clogging of pipes.
When installing, keep the direction on the watch case consistent with the direction of the water flow. And the place where the water meter is installed. The location should be convenient for us to read or change later. The place where the water meter is installed should not be installed in a place exposed to the sun and freezing.
When the water meter is installed, the reading side should be facing up.
The direction of the arrow on the water meter should be the same as the direction of the water flow in the pipe.
If the water meter is installed outdoors, it must be protected against sun and frost. Because the outdoor environment is better than the indoor environment. If the water meter is exposed to the sun or cold for a long time, the service life of the water meter will be affected. If the gear of the water meter is exposed to the sun for a long time. It will cause deformation and damage. This will affect the accuracy of water meter measurement.

Extended reading: Beginner’s Guide: Variable area flow meter

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Sino-Inst offers over 30 residential water meter products.

A wide variety of residential water meter options are available to you, such as free samples, paid samples.

Sino-Inst is a globally recognized supplier and manufacturer of residential water meter, located in China.

The top supplying country is China (Mainland), which supply 100% of the residential water meter respectively.

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. residential water meter products are most popular in Domestic Market, Southeast Asia, and Mid East.

You can ensure product safety by selecting from certified suppliers, with ISO9001, ISO14001 certification.

KimGuo11

drurylandetheatre.com

Chilled Water Flow Meter

Posted on June 4, 2021 by KimGuo11

Application

What is a Chilled Water Flow Meter?

A chilled water flow meter refers to a flow meter that can be used to measure low-temperature water. Common chilled water flow meters include electromagnetic flow meters, turbine flow meters, and ultrasonic flow meters. Used in the condensing system, chiller, or HVAC.

RFQ More flow meters

Chilled Water Flow Meter Types

There is no best water flow meter, only the most suitable water flow meter. Because the application details of each pipeline are different. According to the actual measurement situation, select the most suitable flowmeter. Can save a lot of time and cost.

A magnetic Flow Meter is a flow meter that measures the flow of conductive fluids. Abbreviated as EMF, also called Electromagnetic flowmeters. It is a kind of Volumetric flow meter. A magnetic flow meter measures the velocity of conductive liquids moving through a pipe or conduit. In the wastewater treatment industry, a Magnetic Flow Meter is the best flow meter choice.

Extended reading: 2 inch Water 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.

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.

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.

Featured Chilled Water Flow Meters

Extended reading:
What is the K-factor in a flow meter?
Cryogenic Flow Meters|Liquid Nitrogen-Liquid Oxygen-LNG fluids

What are the limitations of electromagnetic flowmeters at low temperatures?

Electromagnetic flowmeter transmitters are bound by two aspects when measuring cryogenic media.

The transmitter output signal of the electromagnetic flowmeter is small. It is necessary to take care to prevent annoyance.

The temperature and pressure used cannot be too high. The temperature used at that time does not exceed 200°.

For those media above minus 20 degrees, the lining material of electromagnetic flowmeter is usually PTFE.

PTFE is the most stable plastic among chemical materials. However, thermal expansion and contraction are more serious, and the electrode leaks easily.

Extended reading: Ultrasonic Water Meter for Residential Water

If there is no special treatment, when it is used for the measurement of low-temperature medium, the appearance of condensation or condensation on the outer wall of the measuring tube and the transmitter will occur briefly.

The signal will be broken, the insulation resistance between the circuit and the case will decrease, or even a short circuit.

Extended reading: Insertion Ultrasonic Water Flow Meter – Designed for Agricultural Irrigation, Garden Management

Can ultrasonic flowmeter measures chilled water flow?

Ultrasonic flowmeter can measure flow. The temperature does not exceed -40℃~160℃. It is required to have a full tube and a uniform medium. It can display instantaneous flow, flow velocity, accumulated flow, accumulated running time, etc.
Ultrasonic calorimeter can measure heat supply, flow and temperature monitoring. Air conditioning heating and cooling capacity measurement.

When you place an order, you can specify whether it is to measure flow or heat. We will help you choose the model.

Extended reading: Industrial VS Residential inline water flow meters

How to measure the chilled water flow of the chiller?

The following is our experience sharing: Freezer chilled water flow measurement techniques. Hope it can be helpful to you.

1.Water pressure detection of the water inlet and outlet pipes of the freezer

Through the detection of the return water pressure and the outlet water pressure value. Check the water flow rate of the freezer under the pressure difference between the inlet and outlet water in the random manual of the freezer.

By referring to the corresponding table or diagram of the unit’s water flow in the manual. So as to determine whether the freezer system is normal.

And through this difference to determine which section of the water pipeline has a higher resistance value. And make corresponding rectification plans and actions.

2.Detection of the return water temperature and outlet water temperature of the refrigerator (the unit needs to be in normal state)

30 minutes after starting up, check the system or chilled water system inlet and outlet thermometers through the parameters of the unit’s control system.
It can read the inlet water temperature and outlet water temperature when the unit is running. The difference must be about 4-6 degrees.

If the temperature difference between the inlet and outlet water is too large, it means that the water flow of the water system through the plate is too small. This may cause the unit to fail to operate normally or be damaged.

3.Water pump running current detection

By detecting the running current of the refrigerator water pump, it is compared with the rated current. It can be judged whether the actual water flow is larger or smaller than the rated water flow of the pump.

Comprehensive judgment together with the previous parameters. In order to get an exact test and analysis report of the chiller system.

4.Detection of the suction temperature of the compressor copper pipe (only when the refrigeration is running)

If it is 30 minutes after the refrigerating and freezer is turned on

It is detected that the suction temperature of the compressor is lower than 0 degrees. It means that the water flow in the water-side heat exchanger is not enough, which leads to a drop in the evaporation temperature and the evaporation pressure.

And cause Freon is still evaporating and absorbing heat in the suction pipe that flows from the evaporator to the compressor. Will cause the compressor suction temperature to be lower than 0 degrees.

In addition, it is necessary to eliminate the drop in evaporation pressure and evaporation temperature caused by the water temperature set point being too low.

The non-standard low water temperature unit can be considered normal as long as the compressor has a suction superheat of 6-8℃.

So under normal water flow. The suction temperature of the compressor is generally greater than 0°C. Below this value, water system problems need to be ruled out.

Frequently
Asked
Questions

Help Center

Instruments that measure the linear, nonlinear, mass or volumetric flow rate of water are collectively referred to as water flow meters.

Electromagnetic flowmeters, turbine flowmeters, ultrasonic flowmeters, vortex flowmeters, and float flowmeters are all available.

In general, electromagnetic flowmeters are commonly used flowmeters for measuring conductive water, and they are one of the products with high usage rates. Electromagnetic flowmeters can measure sewage, and are more suitable for highly corrosive media.

If it is monitoring domestic water. Then install the water meter.

If it is industrial water, use a flow meter. According to the diameter and flow range of the pipeline, you can select the appropriate flowmeter.

BTU Meters are widely used in the central air-conditioned systems using chilled water systems, for measuring the thermal energy produced or consumed.

BTU is British Thermal Unit (British thermal unit). 1 BTU is the energy required to heat 1 pound of water to 1 degree Fahrenheit, 1 BTU is about 1055 joules.

Putting it together with the hour, it means how many British thermal units of heat can be pumped out by the air conditioner per hour using the heat pump principle.

According to 1BTU=1055.05585 joules, you can calculate how many joules of heat the air conditioner can pump per hour.

Water flow meters measure and indicate the amount of water flowing through pipes. It can simply and intuitively display the water flow situation for the user. Even the instantaneous flow, cumulative flow and other information.

Extended reading: Orifice Plate Flow Meter

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