Category Archives: Blog

What Is an Air Pressure Transducer?

Posted on by

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
What is an air pressure transducer?

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

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

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

  1. 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.

  1. 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.

  1. 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:

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

Read more about Gas Pressure Transducer-Sensor for Gas Pressure Measurement 

Tools for converting and calculating pressure values

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

More Pressure Measurement Products

Diaphragm Seal Pressure Transmitter
SI2088-W Wireless Pressure Transmitter
SI-1110 Wireless Pressure Transducer
Differential pressure(DP) level transmitter
SI-151 Hydrostatic Level Sensor
Wireless Level Sensor – LoRa 
Flange Mounted Differential Pressure Transmitter
Extended Diaphragm Seal DP Level Transmitter
Remote Seal Differential Pressure Transmitter
Differential pressure(DP) level 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;

  1. 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.;
  2. Pressure sensors are used in automobiles, some high-end motorcycles and almost all internal combustion engines;
  3. Liquid level meter: Most of the field meters used for various liquid level measurement are also pressure sensors;
  4. The source of the weighing signal of most electronic weighing scales and truck scales is also the pressure sensor.
  5. 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:

  1. 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.
  1. 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.

Read more about: What Is A Differential Pressure Transmitter?

  1. 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.

  1. 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.

  1. 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?

Related pressure measurement solutions

Extended reading: Hydrostatic Pressure Transmitter

Sino-Inst offers over 20 air pressure transducers. A wide variety of air pressure transducer options are available to you. Such as free samples, paid samples. Sino-Instrument is a globally recognized manufacturer of air pressure transducers, located in China.

Sino-Inst sells through a mature distribution network that reaches all 30 countries worldwide. Air pressure transducer products are most popular in Europe, Southeast Asia, and Mid East. You can ensure product safety by selecting certified suppliers. With ISO9001, ISO14001 certification.

Steam Pressure Transmitter

Posted on by

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:

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. 
Cryogenic Pressure Transducer
High Frequency Dynamic Pressure Sensor
SI-338 Ceramic Pressure Sensor
SI-303 Low-Pressure Transducer
SI-350 Sanitary Pressure Transmitter

Extended reading: Featured Diaphragm Seal Pressure Transmitters

Steam pressure transmitter installation

  1. 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.
  2. Prevent the pressure transmitter from contacting corrosive or overheated media;
  3. 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;
  4. When measuring the liquid pressure, the pressure port should be opened on the side of the processing pipeline to avoid precipitation and slag;
  5. 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;
  6. Prevent dross from depositing in the duct;
  7. 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;
  8. 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;
  9. 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

You may like:

Extended Reading: Digital Pressure Sensor-RS485

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.

How does a residential water meter work?

Posted on by

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.

Read more about Everything You Need To Know About Electronic Flow 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

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

  1. 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.
  2. 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.
  3. 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.
  4. When the water meter is installed, the reading side should be facing up.
  5. The direction of the arrow on the water meter should be the same as the direction of the water flow in the pipe.
  6. 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

You may like:

Extended Reading: Chilled Water Flow Meter

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.

Mechanical Flow Meters

Posted on by

Selection Guide

What is a mechanical flow meter?

Mechanical flow meters are a type of flow meters that use arrangement moving parts to measure flow. The fluid passes through a series of gears or chambers (positive displacement or PD) or through a rotating turbine or rotor. Mechanical flowmeter is different from electromagnetic and ultrasonic in principle. Mechanical flow meters easily monitor liquid flow rates for water, fuels, viscous fluids and more.

RFQ More Flow Meters

Mechanical flow meter types

There are many types of flow meters.

The electromagnetic flowmeter is based on the electromagnetic principle. When a conductive fluid flows through an electromagnetic field, the velocity of the fluid can be obtained by measuring the voltage.

Ultrasonic flow meters use the principle of ultrasonic acoustics to measure flow velocity. The mechanical flow meter is a relative concept.

Compared with other flow meters, the mechanical flowmeter relies on the rotation and displacement of mechanical parts to measure the flow rate. Common mechanical flow meters have the following categories.

Tool: Volumetric Flow Rate & Pipe Diameter to Flow Speed Calculator

A positive displacement flowmeter as a mechanical flow meter is a common type of Volumetric Flow Meter. It can measure the volume flow of high viscosity and corrosive fluids.

Volumetric flow meter working principle

The positive displacement flow meter is a flow meter that uses mechanical measuring elements to continuously divide the fluid into a single known volume, and repeatedly fill and discharge the volume of fluid to accumulate the total amount of fluid.

Read more about: positive displacement flowmeter

A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.

Rotameter flow meter working principle

When the measured fluid passes through the annulus formed by the cone and floats from the bottom to the top. The differential pressure produced at the upper and lower ends of the float forms the force for the float to rise. Until the rising force equals the weight of the float immersed in the fluid, the float will stabilize at a certain height.
The height of the float in the tapered tube and the flow rate through it correspond to each other.

Read more about Rotameter flow meter-Variable Area Flow Meters

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

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 Flow Meter Working Principle

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.

Read more about Turbine Flow Meter Working Principle

Gear flow meter is a micro digital positive displacement flow meter. Can measure very small flow rates and quantify small volumes of liquid. High and low temperature resistance (-196℃-200℃).

Gear flow meter working principle

With the flow of the medium, the gears mesh and rotate. Under the action of the fluid flow, a pressure difference is formed at both ends of the instrument inlet and outlet. There is no need for power supply. A pair of gears rotate freely. The cavity between the gears is filled with liquid. Discharge and measure the number of revolutions of the gear to know the flow of liquid and liquid flowing through the instrument.

Read more about Gear flow meter for Microflow

Read more about: Beginner’s Guide: Variable area flow meter

Featured Mechanical Flow Meters

Gas Turbine Flow Meter
Liquid Turbine Flow Meter
Turbine Insertion Flow Meter
Rotameter flow meter-Variable Area Flow Meters
Pointer Type Oval Gear Flow Meter
Oval Gear-Marine Fuel Flow Meter
High Temperature Oval Gear Flow Meter – Heating oil
LCD display Oval Gear High Viscosity Flow Meter
Gear flow meter for Micro flow

Integral DP Flow Meter

Extended reading: High-Temperature Oval Gear Heating oil Flow Meter

Of course, if you are not clear about the principle and difference of the above flow meters. Can not choose the appropriate Mechanical Flow Meters. Then, you can also choose the appropriate Mechanical Flow Meters according to the fluid conditions that need to be measured.

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

Below are some of our experience sharing, hoping to help you find the right Mechanical Flow Meters.

Mechanical water flow meters refer to a type of flow meter suitable for clean water processes or applications. The working principle of a mechanical water flow meter is to measure the speed of water flowing through a pipe. This causes the piston or turbine to rotate. The volume flow of water is proportional to the rotation speed of the blades. Compared with electronic water flow meters, mechanical water flow meters may become clogged when the water is dirty or contains large particles. When the water flow is low, the mechanical water meter does not work well.

In most cases, we will choose an electromagnetic flowmeter to measure the flow rate of water. But if it is pure water and cannot conduct electricity, then an electromagnetic flowmeter cannot be used. You can choose a turbine flowmeter to measure.

Extended reading: 2 inch Water Flow Meter

You may like:

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

Diesel Fuel flow meters are digital flow meters for liquid fuel consumption measurement.

Most widely used types are mechanical and digital inline fuel meters. Differential flow sensors are avilable. Like: the turbine, positive displacement (oval gear), Coriolis, and differential pressure flow meters.

Read more about: Diesel Fuel Flow Meters

Industrial Fuel Flow Meters

The oval gear flowmeter is particularly suitable for measuring high viscosity media. And it is not sensitive to changes in the viscosity of the liquid being measured.

Measurable medium:
Fuel, diesel, gasoline, heat transfer oil, hydraulic oil, kerosene, tar, petroleum, crude oil, asphalt, resin and other liquids. Especially suitable for the measurement of high viscosity liquids.

Read more about:

LCD display Oval Gear High Viscosity Flow Meter

T-series Coriolis Mass Flowmeter for High Viscosity Liquids

A mechanical gas flow meter is a precision instrument used to measure the volume of gas flowing through a pipe. It is typically used in industrial and commercial applications where accurate measurement of gas flow is critical.

Mechanical flow meters that can measure gas flow mainly include metal float flow meters and turbine gas flow meters. And orifice plate meter.

A Rotameter flow meter is a variable area flow meter based on float position measurement. It is suitable for liquid and gas volumetric flow measurement and control.

Gas turbine flow meter is a velocity flow meter that measures gas flow. For natural gas, nitrogen, and gas trade measurement.

Relatively speaking, the cost of gas turbine flow meters is higher than that of Rotameter flow meters. But the service life will be longer.

Extended reading: How does a rotameter work

Extended reading: Gas Rotameter Tips

For cryogenic fluids, such as liquid nitrogen, liquid oxygen, etc. It can reach -196 degrees Celsius.

For cryogenic fluids, we provide gear flow meters and low-temperature turbine flow meters.

You can choose the right one according to the flow range.

Read more General-purpose Flow Totalizer for Data collection and calculation

Mechanical oil flow meters are devices that measure the rate of oil flow. They are often used in industrial and commercial applications to monitor the rate of oil consumption or production.

There are several different types of mechanical oil flow meters, each designed for a specific application. The most common type of mechanical oil flow meter is the positive displacement (PD) meter. PD meters measure the volume of oil that passes through the meter by displacing a fixed amount of fluid with each revolution of the measuring chamber. This type of meter is very accurate and is often used in applications where precise measurement is critical.

Another type of mechanical oil flow meter is the turbine meter. Turbine meters measure the rate of oil flow by measuring the speed of a rotating turbine blade. Turbine meters are less accurate than PD meters but are more resistant to fouling and clogging.

Read more about: oil flow meter types

No matter which Mechanical Flow Meters you choose. The signal output by Mechanical Flow Meters, such as 4-20mA. The flow signal can be connected to a paperless recorder. Carry out multi-channel flow signal monitoring.

Extended reading: Make Ultrasonic Open Channel Flow Meter Work for You

Frequently
Asked
Questions

Help Center

Flow Metering Principals
Differential Pressure Flowmeters
Velocity Flowmeters
Positive Displacement Flowmeters
Mass Flowmeters
For Open Channel Flowmeters – weirs, flumes, submerged orifices, current meters, acoustic flow meters, and more
For different working principle, We offer different types of flow meters, like:
Differential Pressure Flow Meters
Orifice Plate
Venturi Tube
Flow Nozzles
The Sonic Nozzle – Critical (Choked) Flow Nozzle
Calorimetric Flowmeter
Ultrasonic Doppler Flowmeter
Positive Displacement Flowmeter
Variable Area Flowmeter or Rotameter
Velocity Flowmeters
Pitot Tubes
Electromagnetic Flowmeter
Turbine Flowmeter
Vortex Flow Meter
Thermal Flowmeter
Coriolis Flowmeter
Mass Flowmeters
Open Channel Flowmeters

Read more about: Flow Meter Selection Guide

Residential water meters can measure the water consumption of a household.
Industrial water meters mainly refer to water flow meters. Can measure the amount of industrial water. For example, the amount of wastewater discharged.
Extended reading: 2 inch Water Flow Meter

Digital flow meter is a flow meter with digital display and signal output. Digital flow meter refers to a flow meter with digital display and signal output.Different digital flow sensors include turbine, thermal mass, electromagnetic, ultrasonic, orifice plate, venturi. The different designs of the flowmeters have a variety of applications. With 4-20ma, RS485, or others output.
Extended reading: Hot Water Flow Meters Improve Heating-Boiler System

Mechanical flowmeters are generally equipped with pointer display heads.
The pointer indicates the instantaneous flow.
Above is a single cumulative flow, which can be reset;
Below is the total accumulated flow, which cannot be reset.

Extended Reading: Insertion Flowmeter Types

The choice between a mechanical and a digital flow meter really depends on your specific needs. Mechanical flow meters, such as positive displacement or turbine flow meters, are often more cost-effective and simpler to use. However, digital flow meters, like electromagnetic or ultrasonic ones, offer higher precision, more data output, and need less maintenance. So, if you value accuracy over cost, a digital flow meter might be the better choice.

An example of a mechanical flow meter is the turbine flow meter. In a turbine flow meter, the fluid moves a turbine in the meter, and the rate of rotation of the turbine is converted into a flow measurement. They are widely used in applications where a high degree of accuracy is not essential, such as water distribution and HVAC.

Flow meters can be broadly categorized into several types, but here are three common ones:

a. Differential Pressure Flow Meters: These measure the flow rate by introducing a constriction in the flow. This creates a pressure drop, which can be correlated with flow rate.

b. Positive Displacement Flow Meters: These measure flow by repeatedly filling and emptying compartments with the fluid to be measured.

c. Velocity Flow Meters: These measure the velocity of the flow and convert it to the flow rate. Examples include turbine, electromagnetic, and ultrasonic flow meters.

A mechanical water flow rate meter is a device that measures the rate of water flow in a pipeline. It usually employs moving parts, such as a turbine or a set of rotating gears, which move proportional to the flow of water. This movement is then translated into flow rate data.

A mechanical water flow meter works by using the flow of water to move parts of the device. For example, in a turbine flow meter, water flows through the meter, causing a turbine to spin. The rotation speed of the turbine is directly proportional to the water flow rate. In a positive displacement meter, a known volume of water is allowed to fill a chamber, and the number of times this chamber is filled and emptied represents the flow rate.

The accuracy of a mechanical water flow meter can vary based on the specific type of meter and the conditions of use. Generally, they offer moderate to high accuracy. For example, turbine flow meters usually have an accuracy within ±1% of the reading, while positive displacement meters can be even more accurate. However, mechanical meters are subject to wear and tear over time, which can impact accuracy, so regular maintenance is recommended.

Guess you like: What is Reynolds number?

More Featured Flow Measurement Solution

  • Flow Pressure Transducers for Fluid Pipelines

    Flow Pressure Transducers are measurements of fluid pressure within a pipeline. When fluid flows through a pipe, pressure acts on the pipe wall. The medium in the pipeline can be…

  • Crude Oil Flow Meter

    Crude Oil Flow Meter refers to a type of flow meter that can accurately monitor and measure the flow of crude oil. Crude oil is an industrial raw material with…

  • Non Contact Flow Meters Measure Liquid Flow

    What is non contact flow meter? Non Contact Flow Meters refers to flow meters that can achieve flow measurement without contacting the fluid medium. No need to destroy the pipeline…

  • LORA Water Meter

    LORA Water Meter is a commonly used wireless water meter/wireless flowmeter. The wireless remote water meter measures the water flow in the pipeline. The microcomputer in the water meter automatically…

  • Mechanical Oil Flow Meters

    What is mechanical oil flow meter? Mechanical oil flow meter refers to a flowmeter that can detect the volume flow of oil inline. Most importantly, this type of flowmeter is…

Mechanical Flow Meter Selection Guide

How to choose the most suitable mechanical flowmeter for you? It is recommended to refer to the following points:

  • Identify Your Needs: Understand your application. Is it for irrigation, industrial use, or residential water supply? Different applications may have different flow rate, accuracy, and durability needs.
  • Consider the Fluid: What type of fluid are you measuring? The viscosity and corrosiveness of the fluid can affect the meter’s performance.
  • Evaluate the Flow Rate: Check the flow rate range required for your application. Mechanical flow meters like turbine and positive displacement meters have different suitable flow rate ranges.
  • Review Installation Requirements: Consider the pipe size, location, and installation orientation. Some flow meters have specific installation requirements to work optimally.
  • Check the Accuracy Level: How accurate does your measurement need to be? Choose a flow meter with an accuracy level that matches your needs.
  • Budget: Determine how much you’re willing to spend. Keep in mind that the cost of the meter itself is not the only factor – also consider the cost of installation and ongoing maintenance.
  • After-Sales Support: The manufacturer’s reputation and the quality of after-sales support can be crucial, especially for complex meters.

Remember, there’s no one-size-fits-all solution. Take the time to review these steps and make the right decision for your specific application. Happy flow meter shopping!

Mechanical flow meter price

Sino-Inst offers Mechanical Flow Meters with best price. Please contact our sale engineer for quotation.

Sino-Inst offers over 50 Mechanical Flow Meters for flow measurement. About 50% of these are differential pressure flow meters, 40% is the turbine flow sensor, and 20% are dp flow meters and gear flow meters.

A wide variety of Mechanical Flow Meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.

Industrial Oil Flow Meters

Posted on by

The oil Flow Meter is very important for industrial production and trade settlement. This article mainly wants to help users find the suitable industrial Oil Flow Meter effectively.

LEARN MORE

Industrial oil flow meters measure the volume or mass of oil. Can realize the mutual conversion of volume and mass.

The main industrial oils are hydraulic oil. Gear Oil. Turbine oil. Compressor oil. Refrigeration oil. Transformer oil. Cylinder oil, heat treatment oil, heat transfer oil, etc. Of course, edible oil can also be produced in the industry. In addition, there are greases with lubricating oil as base oil and thickening agent.

Therefore, whether it is a company that uses, trades, or produces oil, it needs to accurately measure the oil flow.

There are many common oil flow meters, such as turbine flow meters, positive displacement flow meters, gear flow meters, mass flow meters, etc.

Then, we need to choose a suitable flow meter that meets the measurement and budget according to different working conditions.

Oil flow meter digital refers to an oil flow meter with a local digital display function. The flowmeter can be configured with local digital display, pointer display, and without local digital display. Therefore, it is determined whether the digital display function is needed according to the needs of users.

Explore Oil and Gas Flow Meters

The signal output by the flowmeter is generally a pulse signal or a 4-20mA current signal, both of which output instantaneous flow.

The flowmeter voltage signal is unstable. It is simply disturbed during long-distance transmission. The current signal is relatively stable.

The current signal is used in the transmission process, and the voltage signal (the range of voltage value) is used for detailed control in the control instrument (integrator) and DCS system.

Extended reading: Crude Oil Measurement – Radar Level Meter Measuring Vaulted Buffer Tank

The mechanical oil flow meter is a type of flow meter. The mechanical flowmeter is a purely mechanical measuring component. Such as turbine flowmeter, rotameter, etc. Relatively speaking, for example, ultrasonic flowmeters use ultrasonic principles instead of mechanical principles. So the ultrasonic flowmeter is not a mechanical flowmeter.

Oil is generally transported through pipelines. There are many ways to measure oil flow. For example, use the oil tank level difference to calculate the oil flow. Of course, the simplest and most effective way is to use a flow meter.

Although the types of oil flow meters are different, their working principles are different. However, they can all help us achieve a goal. That is to measure and monitor the flow of oil. Instantaneous flow, cumulative flow, etc.

So that we can better control production and trade.

Extended reading: What Is Hydraulic Flow Meter?

Oil flow meter types

At present, the following types of flow meters can be used to measure oil: Turbine flow meters. Gear flow meter. Vortex flowmeter. Ultrasonic flow meter. Mass flowmeter. Differential pressure flow meters.

Turbine Flow Meters

Turbine flow meters are velocity flow meters, also called impeller flow meters. Used to measure the instantaneous flow and cumulative flow of liquids and gases.

Vortex Flow Meters

Vortex flow meter, also called Vortex shedding flow meter. Vortex Flow Meter is suitable for flow measurement of steam and various liquids and gases.

Ultrasonic Flow Meters

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.

Differential Pressure Flow Meters

Differential Pressure Flow Meter is also called DP flow meter. Differential pressure flow meters use the principle of differential pressure to measure the flow of liquid, gas and steam.

Volumetric Flow Meters

Volumetric Flow Meter, as a mechanical flow meter, is also called Positive displacement flowmeter. It can measure the volume flow of high viscosity and corrosive fluids.

Mass Flow Meters

Mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density, temperature and viscosity of the medium

You can find a suitable flow meter in the appropriate type of oil flow meter according to your needs. Of course, maybe, you don’t know what type of flowmeter you should use.

Extended Reading: Fuel Flow Meters for Diesel-Marine fuel-Industrial oil

Next, we recommend suitable flow meters for some commonly used oils.

The fuel flow meter is an instrument that can monitor fuel flow. Industrial Fuel is an important energy source. For example, diesel, marine fuel, gasoline, etc.

Industrial Fuel is an important energy source for production and manufacturing. For example, diesel, marine fuel, gasoline, etc. It is very necessary to accurately measure industrial fuel. Commonly used industrial fuel flow meters, such as turbine flow meters, gear flow meters, mass flow meters, ultrasonic flow meters, etc.

If your fuel has low viscosity and good flow rate. You can first refer to the turbine flowmeter. As long as the pressure and flow range are satisfied, you can find a suitable flow meter and use the best price.

Extended reading: Flow Totalizer F3000X for Data collection and calculation

Turbine Sanitary flow meter

If you need to measure the flow of cooking oil. Such as sunflower oil. Then, the sanitary flowmeter is the first choice.

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 a pulse frequency signal. It is used to detect instantaneous flow and total integrated flow. A Sanitary flow meters can be used in food, sports drink, liquor, and other beverage industries, in preprocess applications.

Read more about: Sanitary Flow Meters-316SS,Tri clamp-Pulse- for Brewery

Vortex Shedding Flow Meter

The heat transfer oil uses a high-temperature vortex flowmeter to measure the flow rate. Can meet the measurement of high temperature. the best price.

Extended Reading: Summary Of Crude Oil Flow Measurement Options

LCD display Oval Gear High Viscosity Flow Meter

For measuring lubricating oil, the mechanical oval gear flowmeter is the first choice. Because of measuring temperature, high viscosity measurement can be met. Oil with low viscosity can be measured with a turbine flowmeter.

To measure crude oil, you can also consider the oval gear flowmeter first. If the precision is extremely high. Then you can use a mass flow meter.

Extended reading: Oil Level Measurement Solutions for the Oil & Gas Industry

There is no hydraulic oil flow meter in the strict sense. It is not accurate to say which flowmeter is a hydraulic flow meter. Which one to use depends on the specific flow measurement conditions.

For example, the hydraulic oil is also labeled, 40 #, 46 #, or other viscosity properties. Then choose a suitable flow meter according to the relevant information such as flow, pressure, viscosity, and so on.

Read more: How to Select Hydraulic flow meter for Hydraulic oil flow? 

Of course, turbine flowmeters can be considered first.

Extended Reading: Guide and Selection for Diesel Fuel Flow Meters

The heating oil flow meter is also called a heating oil flow gauge. It is a high-temperature mechanical fuel meter. A high-temperature type oval gear flow meter can be used as a heating oil flow meter. Can reach 60℃~200℃.

Read more.

If you need to measure high temperature and high pressure (-0.1MPa-32MPa) oil storage tanks, then learn about New Choice for Heating Oil Tank Level Sensor.

Extended Reading: Petroleum Flow Meter

Of course, the above are just our suggestions. If you need to choose the right flow meter. You can contact Sino-Inst sales engineers. We will provide you with the most suitable measurement solution.

You may like:

Sino-Inst offers over 30 Industrial Oil Flow Meters for flow measurement. About 50% of these are Turbine flow meters, 40% is the mass flow sensor, and 20% are DP flow meter.

A wide variety of Industrial Oil Flow Meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.

Fluid Flow Meters

Posted on by

Fluid Flow Measurement Devices

Fluid Flow Meters measure the amount of liquid, gas, or steam passing through the piping system. Most Fluid Flow Meters are designed to measure the speed of fluid flowing through pipes. They use this information and the internal cross-sectional area of the pipe to calculate the volume. Or the amount of mass of fluid passing through the system in a given period of time (that is, 50 gallons per minute).

RFQ
More Flow Meters

Fluid flow meter principle

Principles of mechanics:

  • Instruments that belong to this type of principle include differential pressure type and rotor type using Bernoulli’s theorem.
  • Impulse type and movable tube type using the momentum theorem.
  • Use the direct mass formula of Newton’s second law.
  • Target type using the principle of fluid momentum.
  • Turbine type using the angular momentum theorem.
  • Vortex type and vortex street type using the principle of fluid oscillation.
  • Pitot tube type and volume type, weir, trough type, and so on using total static pressure difference.

Principles of Electricity:

Instruments used in this type of principle include electromagnetic, differential capacitive, inductive, strain resistance, etc.

Acoustic principle:

Ultrasonic type is used for flow measurement using acoustic principles. Acoustic type (shock wave type) and so on.

Thermal principle:

There are calorimetric, direct calorimetry, indirect calorimetry, etc., which use thermal principles to measure flow.

Optical principle:

Laser type, photoelectric type, etc. are instruments that belong to this type of principle.

Based on physical principles:

Nuclear magnetic resonance, nuclear radiation, etc. are instruments that belong to this type of principle.

Other principles: There are marking principles (tracing principles, nuclear magnetic resonance principles), related principles, etc.

Extended reading: U-series Liquid Mass Flow Meter | Liquid-slurry flow measure

Fluid flow meter types

  1. According to the measurement objects, there are two categories: closed pipes and open channels.
  2. According to the principle of measurement, there are mechanical principles, thermal principles, acoustic principles, electrical principles, optical principles, atomic physics principles, etc.
  3. According to the purpose of measurement, it can be divided into total measurement and flow measurement. The meters are called total meter and flow meter respectively.

Liquid flow meters can be divided into: anti-corrosion flow meters. Liquid flow meters.. Differential pressure flow meters. Ammonia flow meters. Turbine flow meters. Electromagnetic flow meters. Vortex flow meters in fluid oscillating flow meters. Mass flow meters.

The differential pressure flowmeter is a meter that calculates the flow rate based on the differential pressure generated by the flow detection element installed in the pipeline, the known fluid conditions and the geometric dimensions of the detection element and the pipeline.

The differential pressure flowmeter is composed of a primary device (detection part) and a secondary device (differential pressure conversion and flow display instrument).

Differential pressure flowmeters are usually classified in the form of detection parts, such as orifice flowmeters, venturi flowmeters, and averaging velocity tube flowmeters.

The secondary devices are various mechanical, electronic and electromechanical integrated differential pressure gauges, differential pressure transmitters and flow display instruments.

It has been developed into a large class of instruments with a high degree of three-dimensionalization (serialization, generalization, and standardization) and a large variety of specifications. It can measure flow parameters as well as other parameters (such as pressure, level, density, etc.)

Extended Reading: Advantages and disadvantages of differential pressure flow meter

The detection parts of the differential pressure flowmeter can be divided into several categories according to its principle of action: throttling device, hydraulic resistance type, centrifugal type, dynamic head type, dynamic head gain type and jet flow type.

Differential pressure flow meters are one of the most widely used flow meters. Among all kinds of flow meters, their usage ranks first.

In recent years, due to the advent of various new flowmeters, its usage percentage has gradually decreased, but it is still the most important type of flowmeter.

Extended reading: V-Cone Flow Meter Working Principle

Target flow meters began to be used in industrial flow measurement in the 1960s. It is mainly used to solve the flow measurement of high-viscosity and low-Reynolds number fluids. It has experienced two major development stages of pneumatic meters and electric meters.

SBL series intelligent target flowmeter is based on the measurement principle of the original strain gauge (capacitive) target flowmeter. The latest force sensor is used as the measurement and sensitive transmission element. At the same time, modern digital intelligent processing technology is used. And developed a new type of flow meter.

Positive displacement flow meters, also known as fixed displacement flow meters, or PD flow meters for short. It is the most accurate type of flow meters.

It uses a mechanical measuring element to continuously divide the fluid into a single known volume part. The total volume of the fluid is measured according to the number of times that the measuring chamber is filled with and discharged the volume part of the fluid successively.

Extended reading: Positive Displacement Flow meter Technology

Positive displacement flow meters are classified according to their measuring components and can be divided into oval gear flow meters, scraper flow meters, dual rotor flow meters, rotary piston flow meters, reciprocating piston flow meters, disc flow meters, and liquid-sealed tumbler flow meters. , Wet gas meter and membrane gas meter, etc.

Extended reading: Flow Totalizer F3000X for Data collection and calculation

The turbine flowmeter is the main type of velocity flowmeter. It uses a multi-blade rotor (turbine) to sense the average flow rate of the fluid. It is a meter that derives the flow or total amount from it. Generally, it is composed of two parts, a sensor and a display, and it can also be made into an integral type.

Turbine flowmeters, positive displacement flowmeters, and mass flowmeters are referred to as the three types of flowmeters with high repeatability and high precision, and are one of the top ten types of flowmeters.

An electromagnetic flowmeter is an instrument for measuring conductive liquid made according to Faraday’s law of electromagnetic induction.

The electromagnetic flowmeter has a series of excellent characteristics. It can solve the problems that other flowmeters are not easy to apply, such as the measurement of dirty flow and corrosive flow.

The vortex flowmeter is a meter in which a non-streamlined vortex generator is placed in the fluid. The fluid is alternately separated on both sides of the generator to release two series of regularly staggered vortices.

Vortex flowmeters can be classified into stress type, strain type, a capacitive type, thermal type, vibrating type, photoelectric type, an ultrasonic type according to the frequency detection method.

An ultrasonic flowmeter is a meter that measures the flow rate by detecting the effect of fluid flow on the ultrasonic beam (or ultrasonic pulse).

According to the principle of signal detection, ultrasonic flowmeters can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method, and frequency difference method), beam shift method, Doppler method, cross-correlation method, and spatial filtering method And noise law, etc.

Ultrasonic flowmeters are the same as electromagnetic flowmeters. Because there are no obstructions in the flow channel of the instrument, they are non-obstructive flowmeters. They are a type of flowmeter suitable for solving difficult problems in flow measurement. Especially in large-diameter flow measurement.

Extended reading: Make Ultrasonic Open Channel Flow Meter Work for You

Coriolis Mass Flowmeter is a novel instrument that directly and accurately measures the mass flow of fluids. The main structure adopts two U-shaped tubes arranged side by side. The curved parts of the two tubes vibrate slightly towards each other. Then the straight pipes on both sides will follow the vibration. That is, they will move closer or open at the same time. That is, the vibration of the two pipes is synchronized and symmetrical.

If the fluid is introduced into the pipe while the pipe is vibrating synchronously, so that it flows forward along the inside of the pipe, the pipe will force the fluid to vibrate up and down together with it.

The thermal flow meter sensor contains two sensing elements. A speed sensor and a temperature sensor. They automatically compensate and correct for gas temperature changes.

The electric heating part of the instrument heats the speed sensor to a certain value higher than the temperature of the working condition. A constant temperature difference is formed between the speed sensor and the sensor that measures the temperature of the working condition.

When the temperature difference is kept constant, the energy consumed by electric heating, which can be said to be the heat dissipation value, is proportional to the mass flow rate of the gas flowing through.

The rotameter consists of two parts.

One piece of rotameter is a tapered tube that gradually expands from bottom to top.

The other part of the rotameter is a rotor that is placed in a tapered tube and can move freely up and down along the centerline of the tube.

When measuring the flow of fluid, the measured fluid flows in from the lower end of the tapered tube. The flow of the fluid impacts the rotor and generates a force on it (the magnitude of this force varies with the magnitude of the flow).
When the flow is large enough, the generated force will lift the rotor and raise it.

At the same time, the measured fluid flows through the annular section between the rotor and the tapered tube wall.

There are three forces acting on the rotor at this time: the dynamic pressure of the fluid on the rotor, the buoyancy of the rotor in the fluid, and the gravity of the rotor itself.

When the flowmeter is installed vertically, the center of gravity of the rotor coincides with the tube axis of the tapered tube, and the three forces acting on the rotor are all along the direction parallel to the tube axis.

When these three forces reach a balance, the rotor floats smoothly on a certain position in the cone.

For a given rotameter, the size and shape of the rotor have been determined. Therefore, its buoyancy in the fluid and its own gravity are known to be constant. Only the dynamic pressure of the fluid on the float changes with the flow rate of the incoming flow. of.

Therefore, when the flow rate of the incoming flow becomes larger or smaller, the rotor will move up or down. The flow cross-sectional area of the corresponding position also changes. Until the flow rate becomes the corresponding speed when the flow rate becomes balanced, the rotor will be stable in the new position.

For a given rotameter, the position of the rotor in the cone tube is in a one-to-one correspondence with the flow rate of the fluid flowing through the cone tube.

The fluid-filled with the pipe flows through the throttling device in the pipe. It causes local contraction near the throttling piece, and the flow velocity increases. There is a static pressure difference between the upstream and downstream sides.

Under the condition of known relevant parameters, according to the principle of flow continuity and Bernoulli equation, the relationship between differential pressure and flow can be deduced to obtain the flow.

Read more about: Orifice Flow Meter

Different from the previous ones, the open channel flow meter is a flow meter that measures the natural flow of the free surface in a non-full tubular open channel.

The working principle of the open channel flowmeter is to use the open channel technology. By measuring the fluid level height, the flow rate is obtained through the calculation of the internal microprocessor of the instrument.

Because it is a non-contact measurement, the open channel flowmeter can be used in harsher environments.

The open channel flowmeter launches and receives the open channel under the control of the computer.

Calculate the distance between the open channel flowmeter and the measured liquid level according to the transmission time. Thus the liquid level height is obtained. Because there is a certain proportional relationship between the liquid level and the flow rate.

Therefore, the liquid flow rate Q can be finally obtained according to the calculation formula.

Hydraulic fluid flow meter

Industrial Hydraulic oil flow meter, also called hydraulic flow meter gauge. Hydraulic oil flow meters are inline flow meters for hydraulic oil flow measurement.

Sino-Inst offers Turbine, Mass flow, Oval gear, V-cone, Target, and Orifice flow meters for inline hydraulic oil flow. Features like: bidirectional, high pressure, analog, can be customized as customer need.

Extended reading: What Is Hydraulic Flow Meter?

Ultrasonic fluid flow meter

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.

Fluid mass flow meter

Fluid mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density of the medium and indirectly measure the temperature of the medium.

A flow measuring instrument that measures the mass flow in the pipeline. The measured fluid is under the condition that the pressure, temperature and other parameters change greatly. If only the volume flow is measured, the change in fluid density will bring about a large measurement error.

In positive displacement and differential pressure flowmeters, the density of the fluid to be measured may vary by 30%, which will cause an error of 30 to 40% in the flow rate.

With the improvement of automation level, many production processes have put forward new requirements for flow measurement. The chemical reaction process is controlled by the quality (not the volume) of the raw materials.

The heating and cooling effects of steam and air flow are also proportional to the mass flow.

The strict control of product quality, accurate cost accounting, and fuel control of airplanes and missiles all require precision. Therefore, the mass flow meter is an important flow measuring instrument.

You may like: High-Temperature Oval Gear Heating oil Flow Meter

Fluid Flow Meters Selection Guide

How to select the flowmeter？

It can be considered from five aspects. These five aspects are flow meter performance, fluid characteristics, installation conditions, environmental conditions and economic factors. The detailed factors in the five areas are as follows:

  1. Instrument performance: accuracy, repeatability, linearity, range, flow range, signal output characteristics, response time, pressure loss, etc.;
  2. Fluid characteristics: temperature, pressure, density, viscosity, chemical corrosion, abrasiveness, fouling, miscibility, phase change, electrical conductivity, speed of sound, thermal conductivity, specific heat capacity, isentropic index;
  3. Installation conditions: pipeline layout direction, flow direction, length of the upstream and downstream side of the test piece, pipe diameter, maintenance space, power supply, grounding, auxiliary equipment (filter, getter), installation, etc.;
  4. Environmental conditions: ambient temperature, humidity, electromagnetic interference, safety, explosion-proof, pipeline vibration, etc.;
  5. Economic factors: instrument purchase, installation, operation, calibration, maintenance, instrument service life, spare parts, etc.

The flowmeter selection steps are as follows:

  1. According to the fluid type and five consideration factors, the available instrument types are initially selected (there are several types for selection);
  2. Collect data and price information for the primary selection type. Prepare conditions for in-depth analysis and comparison;
  3. Use the elimination method to gradually concentrate on 1 or 2 types. It is necessary to repeatedly compare and analyze the five factors to finally determine the pre-selection target.

Frequently asked questions

Contact Us

The easiest way to measure fluid flow is to install the instrument. Such as flow meters, flow meters. Can monitor the flow of gas, liquid and other fluids.

A liquid flow meter is a kind of meter that measures the flow of liquid fluid in pipes or open channels. Liquid flow meters can effectively monitor liquid flow rates for water, fuels, chemicals and more fluids.

Read more about: Liquid Flow Meters Selection Guide

  • Differential Pressure type. Orifice plates. Venturi meters. Annubar.
  • Differential Area type (Rotameters)
  • Electromagnetic flowmeters.
  • Ultrasonic flowmeters.
  • Turbine flowmeters.
  • Vortex flowmeters.
  • Positive Displacement Meters.

Liquid flow meter can be divided into the following categories according to the measurement principle:
Mechanics principles: instruments that fall into this category include differential pressure type and rotor type using Bernoulli’s theorem; impulse type and movable tube type using momentum theorem; direct mass type using Newton’s second law; using fluid momentum principle Target type; turbine type using the angular momentum theorem; vortex type and vortex type using the principle of fluid oscillation; pitot tube type using total static pressure difference, volume type, weir, trough type, etc.
Electrical principle: The instruments used for this kind of principle include electromagnetic, differential capacitive, inductive, strain resistance, etc.
Acoustic principle: There is an ultrasonic method for flow measurement using the acoustic principle. Acoustic (shock wave) etc. Thermal principle: There are calorimetric, direct calorimetry, indirect calorimetry, etc. that use the thermal principle to measure flow. Optical principle: laser type, photoelectric type, etc. are instruments of this type of principle. Principles of atomic physics: nuclear magnetic resonance, nuclear radiation, etc. are instruments that belong to this type of principle. Other principles: There are marking principles (tracing principles, nuclear magnetic resonance principles), related principles, etc.

If you insist on dividing flow meters into three categories. I think it can be divided into velocity flow meters, volumetric flow meters, and mass flow meters.

Related fluid flow measurement devices

Related Blogs

Sino-Inst offers over 50 flow meter for flow measurement. About 50% of these are differential pressure flow meters, 40% is the liquid flow sensor, and 20% are Ultrasonic Level Transmitter and mass flow meter.

A wide variety of flow meters options are available to you, such as free samples, paid samples.

Sino-Instrument is a globally recognized supplier and manufacturer of flow measurement instrumentation, located in China.


Air mass flow meter VS Controller

Posted on by

Air mass flow meter (abbreviated as MFM) is used for precise measurement of gas mass flow.
A gas mass flow controller (abbreviated as MFC) is used for precise measurement and control of gas mass flow.

Read More

Related products

Liquid mass flow controller
Gas mass flow controller
Gas Thermal Mass Flow Meter
 Coriolis Flow Meter
V-series Curved Digital Mass Flow Meter

What is a mass flow meter?

Air mass flow meter, namely Mass Flow Meter (abbreviated as MFM). It is an instrument for accurately measuring gas flow. The measured value is not inaccurate due to temperature or pressure fluctuations. No temperature pressure compensation is required.

Guess you like: Gas Mass Flow Meter

What is a mass flow controller?

The mass flow controller (abbreviated as MFC) not only has the function of the mass flow meter. More importantly, it can automatically control the gas flow. That is, users can set the flow according to their needs. MFC automatically keeps the flow constant at the set value. Even if the system pressure fluctuates or the ambient temperature changes. It will not deviate from the set value.

Simply put, the mass flow controller is a steady flow device. It is a gas steady flow device that can be set manually or connected to a computer for automatic control.

Extended reading: Buy Digital Gas Flow Meters & Controllers For Air-O2-N2-CO2

What does a mass air flow meter do?

Industrial Air mass flow meter is a meter used to measure the flow of industrial gas pipelines. The mass flow meter directly measures the mass flow of the medium passing through the flow meter. It can also measure the density of the medium and indirectly measure the temperature of the medium.

Since the transmitter is an intelligent instrument with a single-chip microcomputer as the core, more than a dozen parameters can be derived for users to use based on the three basic quantities mentioned above.

The mass flow meter has flexible configuration, powerful functions and high performance-price ratio. It is a new generation flow meter.

Extended Reading: Digital air flow meters

What is the principle of a mass flow controller?

The mass flow controller is composed of a flow sensor, a diverter channel, a flow regulating valve and an amplifying controller.

The flow sensor uses the principle of capillary heat transfer thermometry to measure the mass flow of gas (without temperature and pressure compensation).

The flow signal measured by the sensor heating bridge is sent to the amplifier for amplification. The amplified flow detection voltage is compared with the set voltage, and then the difference signal is amplified to control the regulating valve. The closed loop controls the flow through the channel to make it equal to the set flow.

The flow divider determines the flow of the main channel.

A regulated power supply and a digital voltmeter are provided on the flow display instrument matched with the mass flow controller. Set potentiometer, peripherals, built-in conversion and three-position valve control switch, etc.

Extended reading: How To Reduce The Effect Of Pressure On The Mass Flow Meter?

How to understand the flow unit of a mass flow meter/mass flow controller?

Gas mass flow units are generally expressed in sccm (Standard Cubic Centimeter per Minute, standard milliliters per minute) and slm (Standard Liter per Minute, standard liters per minute).

This means that under different conditions of use, the indicated flow rate is the flow rate in the standard state.

The standard state requirements are: air pressure—101325Pa (760mm Hg); temperature—0℃ (273.15K). This is an important difference between this meter and other flow meters, and it is also the difference between sccm and slm from mL/min and L/min.

For most users, the expression method of volume flow is very habitual. Easy to use. But there are also users who need to know the mass of the medium flowing in a unit of time (such as g/min). This requirement is very easy to achieve. Because the gas density in the standard state is a constant. , Can be easily found, so it can be realized by simply doing a multiplication (multiplying the density by several slm). Therefore, the volume flow rate in the standard state is equivalent to the mass flow rate.

When to use a mass flow meter and when to use a mass flow controller?

Generally speaking, when only measuring or monitoring the flow, use a mass flow meter.

When you need to control the flow, use a mass flow controller.

For some measurement occasions, both can be used. For example, when measuring the flow capacity of capillary tubes, use a mass flow meter when measuring flow at a constant pressure.

When measuring pressure with constant flow, a mass flow controller is required.

Note that when the mass flow controller is in the cleaning state. It can also be used as a mass flow meter. It’s just that the pressure drop is larger than that of ordinary mass flow meters.

Extended reading: What is an air pressure transducer?

What are the main advantages of mass flow meters/mass flow controllers?

(1) Flow measurement and control are not inaccurate due to temperature or pressure fluctuations.

For most flow measurement and control systems, it is difficult to avoid system pressure fluctuations and environmental and medium temperature changes. For ordinary flow meters, fluctuations in pressure and temperature will cause larger errors. For mass flow meters/mass flow controllers, it can generally be ignored.

(2) Automation of measurement control

The mass flow meter/mass flow controller can output the flow measurement value as a standard electrical signal output.

In this way, it is easy to realize digital display of flow, automatic measurement of accumulated flow, automatic data recording, computer management, etc.

For mass flow controllers, automatic flow control can also be realized.

Generally, the analog MFC/MFM input and output signals are 0~+5V or 4~20mA, and the digital MFC/MFM is also equipped with RS232 or RS485 digital serial communication ports. It can be easily connected to a computer for automatic control.

(3) Accurately control flow

The mass flow controller can accurately control the given amount of gas. This is particularly useful for flow control in many processes, and for proportional control of different gases.

(4) Wide scope of application

  • With a wide working pressure range, our products can range from vacuum to 10MPa.
  • Can be applied to a variety of gas media (including some corrosive gases, such as HCL).
  • There is a wide flow range. The minimum flow range of our products can reach 0～5 sccm, and the maximum flow range can reach 0～200 slm.
  • The resolution of the flow display can reach 0.1% of the full scale.
  • The flow control range is 2~100% of full scale (range ratio is –50:1). Therefore, it is widely used in many fields.

Read more about:

What are the disadvantages of mass flow meters? What are the fears of using mass flow controllers?

Relative to cheap rotameters, the main disadvantage of mass flow meters is that they are relatively expensive.

There are four fears when using a mass flow controller:

First fear of dust. If dust enters the flowmeter, it will block the sensor and the diverter, causing measurement errors. It is required to install a filter before the air inlet;

The second fear is that liquid and oil will enter the MFC. It will cause loss of control. If the outlet of the MFC is connected to a liquid tank, a check valve must be added to the outlet of the MFC to prevent the liquid from returning;

The third fear of using moist corrosive gas. Moist and corrosive gases will rust the stainless steel and cause damage to the MFC channel. Therefore, it is required to dry the gas and the MFC piping system before using the corrosive gas;

Fourth, fear not operating in accordance with safety rules when using highly corrosive, flammable, explosive, toxic, and other hazardous gases. It may cause product damage and other more serious losses. Correct use and safe operation are important to every user.

Extended reading: Stainless steel flow meters|304-316 optional

Can mass flow controllers be used to control corrosive and special gases? How to choose sealing materials?

Mass flow controllers can be used to control various gases, including corrosive gases and special gases.

But it should be noted that for the use of corrosive gas and special gas, it is necessary to select the model and sealing material appropriately.

When ordering, the user needs to make a special statement to the supplier that the gas is used. In order to avoid serious losses due to wrong selection or selection of sealing materials.

Generally, the wet materials of the gas mass flow controller that contact the working gas are 316L stainless steel, polytetrafluoroethylene, and sealing materials. Sealing materials are divided into two categories: metal seals and rubber seals.

The material of the metal seal is generally corrosion-resistant materials such as stainless steel, gold or nickel.

In principle, MFC with metal seal can be used for any gas. Including various corrosive gases and special gases.

For strong corrosive gases such as boron tribromide, boron trichloride, hydrogen fluoride, and metal oxide gases used in MOCVD, it is recommended to use metal-sealed MFC.

Due to the high price of metal-sealed MFCs, rubber-sealed MFCs are usually used where the requirements are not high.

If there is no special statement, all MFCs are sealed with fluorine rubber. It can be used for most acidic and alkaline corrosive gases. For example, it can be used for halogenated dry gases such as hydrogen chloride.

Some other special corrosive gases require special rubber.

Ammonia-Ammonia resistant rubber, such as ethylene-propylene rubber, neoprene rubber or nitrile rubber is required. Organic solvent vapor (acetone, toluene, etc.)-silicone rubber is required. Boron tribromide, boron trichloride, hydrogen fluoride, etc.-need to use perfluoro rubber.

Sino-Inst offer over 5 Air mass flow meters and controller with Best Price.

A wide variety of Air mass flow meters and controller options are available to you, such as free samples, paid samples. More about Types Of Air Flow Measurement Instruments.

Sino-Inst is Air mass flow meters and controllers suppliers, located in China. Mass Flow Meters products are most popular in North America, Mid East, and Eastern Europe.

Request a Quote

Please enable JavaScript in your browser to submit the form

Magnetic flow meter calibration

Posted on by

Why is magnetic flow meter calibration necessary?

The accuracy of the magnetic flowmeter has been calibrated by the calibration line when it leaves the factory. However, at the use site, due to environmental conditions, fluid characteristics, and instrument damage such as component damage. It often causes instrument operation failures. Therefore, the electromagnetic flowmeter needs calibration. Ensuring accurate flow meter performance is an inestimable part of business planning and costing.

RFQ More

2 Magnetic flow meter calibration methods

At present, there are 2 solutions for Magnetic flow meter calibration: direct and indirect.

Direct Magnetic flow meter calibration is the excitation coil inspection method. This method is also known as the “dry standard” method of electromagnetic flowmeters. Indirect calibration is the external clamp-on ultrasonic flowmeter calibration method. Also known as the “non-contact measurement method”.

However, in the “dry standard” method, the standard coil is directly designed into the meter body of the flowmeter. The performance of its resistance and other indicators cannot be traced regularly.

As a result, it is impossible to determine whether the measurement characteristics of the standard coil change after a period of time. Therefore, “dry standard” is difficult to effectively realize the traceability of the value.

Compared with the “dry standard” method of detection. The external clamp ultrasonic flowmeter is capable of non-stop flow and non-cutting of pipes. The advantages of on-site Magnetic flow meter calibration are not affected by the temperature, pressure, and density of the fluid being measured.

Read more about: Digital Water Flow Meters

Magnetic flow meter calibration procedure

Clamp-on ultrasonic flowmeter calibration electromagnetic flowmeter

Calibration method: non-contact measurement method. That is, the external ultrasonic flowmeter is clamped on the pipe of the measured flowmeter. By comparing the cumulative flow error of the two flowmeters. Determine the measurement characteristics of the flowmeter being inspected.

The external ultrasonic flowmeter calibration method is used for on-site calibration. The inspector should first check whether the input of the key parameters that affect the accuracy of the measurement built in the flowmeter converter is correct.

Ask the staff about the daily flow rate, and observe and calculate the average flow rate of the flowmeter over a period of time.

Big data compared with standard equipment in the laboratory according to the standard table. Enter the pipe diameter of the standard meter and the flow meter to be inspected. Calibration coefficients, outer diameter, wall thickness and other parameters similar to the flow rate. According to the flowmeter’s online operating instructions on-site actual measurement input.

The cumulative flow method is used when calculating the indication error. Read the cumulative value of the flow of the standard meter and the meter under inspection for a certain period of time in three times. As the standard value of the measurement standard meter and the displayed value of the tested flow meter. Each measurement time is 30min.

Conditions permit or when the flow rate changes significantly within a day. Three flow points with obvious differences can be measured.

Extended reading: Industrial Magmeters

Real flow calibration electromagnetic flowmeter

How do you calibrate a magnetic flow meter?

  • Select the corresponding pump according to the pipe diameter and flow rate for the verification test;
  • If the system uses compressed air power. Turn on the air compressor to reach the air source pressure required by the system. To ensure the rapid switching of the commutator and the normal operation of the clamp meter;
  • After the flowmeter is correctly installed and connected. It should be energized and preheated for about 30 minutes under the requirements of the verification regulations;
  • If the high tank water source is used, check whether the overflow signal of the stabilized water tower appears.
  • Before the formal test. According to the requirements of the verification regulations, use the verification medium to circulate the time in the pipeline system. At the same time, check whether there is any leakage in the sealing parts of the pipeline;
  • Before starting the formal verification, the verification medium should be filled with the flowmeter sensor to be tested. Then turn off the downstream valve to adjust the zero position;
  • When starting the verification, first open the valve at the front of the pipeline. Slowly open the valve behind the flow meter under test to adjust the flow at the verification point.
  • During the calibration process, the flow stability of each flow point should be within the 1% ~ 2%-flow method, while the total amount law can be within 5%. When completing the verification process of a flow point, the temperature change of the verification medium should not exceed 1℃. When completing all the verification processes, it should not exceed 5℃. The pressure downstream of the inspected flowmeter should be high enough to ensure that no flashing and cavitation occur in the flow pipeline (especially in the reduced diameter);
  • After each test, the valve at the front end of the test pipeline should be closed first. And then the pump should be stopped to avoid emptying the voltage stabilizing facility. At the same time, empty the remaining verification medium in the test pipeline. Then turn off the control system and the air compressor.

Extended Reading: Guide: Magnetic Flowmeter Installation

Related Products

Magnetic Water Flow Meter
Remote Magnetic Sewage Flow Meter
Insertion Magnetic Flow Meter
Magnetic Sanitary Flow Meter
Magnetic Battery Operated Flow Meter
Magnetic Large Dia. Pipe Flow Meter
Magnetic Open Channel Flow Meter
Magnetic High Pressure Flow Meter
Handheld Ultrasonic Flow Meter
Clamp on Ultrasonic Flow Meter
Ultrasonic Clamp on Flow Meter
Strap on flow meter X3

Magnetic flow meter calibration frequency

The verification period for flowmeters with accuracy grades of 0.2 and better than 0.2 is 1 year. For flowmeters with accuracy grades lower than 0.2 and using quoted errors, the verification period is 2 years.

The electromagnetic flowmeter is a flowmeter that calculates the flow rate by setting a magnetic field perpendicular to the flow direction in a closed pipeline. By measuring the induced electromotive force generated by the movement of the conductive liquid in the magnetic field.
　　
The National Metrological Verification Regulations of the People’s Republic of China JJG 1033-2007 “Electromagnetic Flowmeter” 7.4 The verification period stipulates: The verification period of the flowmeter accuracy level of 0.2 and better than 0.2 is 1 year. For the accuracy level less than 0.2 The maximum verification period for the current level and usage reference error is 2 years.

Extended reading: Ultrasonic Insertion Flow Meter for Lined/Large Pipes

Do magnetic flow meters require calibration?

Mainly depends on your working conditions. If the measurement requirements are high. There are more impurities and dirt in the fluid and poor environmental conditions. Electrode fouling affects the measurement. The measurement is inaccurate after cleaning and repair. It can be verified. If the working conditions are good, the long-term use is normal. No verification is necessary.

You may like:

Sino-Inst flow calibration device and electromagnetic flowmeter production test standard

The manufacture of high-quality electromagnetic flowmeters is inseparable from high-precision flow calibration devices. The flow calibration device is the standard equipment for measurement departments and flowmeter manufacturers for value transmission, traceability and verification testing.

The Sino-Inst team has developed and built a set of high-level water towers as a voltage stabilization source. The static mass method is combined with the standard meter method, and is dedicated to the calibration device of the electromagnetic flowmeter.

The device uncertainty is better than the first-class fluid flow device level of 0.05%. It has passed the appraisal and audit of the Shaanxi Metrology Institute.

The 35-meter-high, 200-cubic-volume water tower is designed with a special overflow device. The fluctuation of the water level and liquid level during calibration measurement does not exceed 8mm. A high stability of better than 0.01% is achieved.

The production of MFE needs to go through various performance tests in a standard laboratory by an authoritative engineer before it can be put on the market.

Electromagnetic compatibility test

Electrostatic discharge (ESD) immunity GB/T 17626.2/ICE 61000-4-2
Electrical fast transient/pulse group (EFT/B) immunity GB/T 17626.4/ICE 61000-4-4
Surge (lightning strike) immunity GB/T 17626.5/ICE 61000-4-5
Power frequency magnetic field immunity GB/T 17626.8/ICE 61000-4-8

Environmental test

High and low-temperature cyclic impact test GB/T2423.1 GB/T2423.2
Salt spray test GB/T2423.17 GB/T6458
Vibration and shock test GB/T2423.10
Hazardous Substance Testing (RoHS): X-ray fluorescence spectroscopy testing IEC62321

Extended reading: Hot Water Flow Meters Improve Heating-Boiler System

Sino-Inst offer over 50 Magnetic Flow Meters, with Best Price.

A wide variety of Water Flow Meters options are available to you, such as free samples, paid samples.

About 13% of these are magnetic flow meter, 14% are Insertion Magnetic Flow Meter, 25% are Venturi flow meter, 13% are ultrasonic flow meter, and others are Liquid Turbine Flow Meters.

Sino-Inst is Magnetic Flow Meters supplier, located in China. Magnetic Flow Meters products are most popular in North America, Mid East, and Eastern Europe. The United States, and India, which export 99%, 1%, and 1% of Magnetic Flow Meters respectively.

How to find leaks using ultrasonic water flow meter?

Posted on by

Application

Ultrasonic water flow meter

The ultrasonic water flow meter is a commonly used water flow meter. It can be installed with an external clamp, Insertion installation, pipeline installation, etc. Hand-held clamp-on ultrasonic flowmeters are very popular for their ease to use.

RFQ

Leak detection method:

Use a portable ultrasonic flowmeter to test the pipeline of the entire system, which can reveal the location of the leak.

The portable flow meter allows the operator to compare the flow rate and the total flow rate at various points in the system.

The low flow at the site indicates that there is a leak nearby. This method is non-invasive and does not require cutting the pipe.

Two ultrasonic flowmeters, one is installed on the water outlet pipe of the reservoir, and the other is installed at the critical intermediate position where the pipe is spread from underground to the ground.

As long as the measurement of the two flowmeters is the same, it means that there is no water leak in the buried pipe network. On the contrary, there is water leak.

Extended reading: Industrial VS Residential inline water flow meters

When a single conduit in a complex piping configuration is compromised, it can be challenging to locate the precise point where the leak occurred. If you observe an increase in overall water consumption without making any changes, it is likely that a pipe has cracks or cracks.

Read more about: Ultrasonic clamp on flow meter Pros and Cons

Related ultrasonic water flow meters

Portable Ultrasonic Flow Meter
Handheld Ultrasonic Flow Meter
Clamp on Ultrasonic Flow Meter
Ultrasonic Clamp on Flow Meter

Read more about: Digital Water Flow Meters

How does an ultrasonic flow meter work?

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.

Extended reading: Ultrasonic flow detectors types

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

Guess You’ll Like: Ultrasonic flow meters types & technical guide

Extended reading: Ultrasonic Insertion Flow Meter for Lined/Large Pipes

Sino-Inst, Manufacturer for Ultrasonic Water Flow Meters. It can measure even liquids such as water, seawater, oil, and slurry.

Sino-Inst’s Ultrasonic Water Flow Meter, made in China, Having good Quality, With better price. Our flow measurement instruments are widely used in China, India, Pakistan, the US, and other countries.

3 inch (3″) Water Meter

Posted on by

Low cost

3″ Water Meter

3″ water meter is also DN80 water meter. Easy to read. Totalizing water volume. Intelligent large-caliber remote water meter includes wired remote transmission and wireless remote transmission. RS485 communication equipment, MODBUS, etc.

RFQ More water meters

Features of 3″ Water Meter

  • Non-magnetic measurement. There is no problem of strong magnetic field attack;
  • GSM mode wireless meter reading. Convenient on-site construction and long transmission distance;
  • Remote measurement, segmented calibration. High measurement accuracy, with low voltage alarm function;
  • Freeze consumption records regularly and upload historical data. 96 records can be uploaded every day;
  • Ultra-low power consumption (static power consumption less than 10pA) design. High-definition LCD display;
  • The pipe section is a straight-through integrated structure manufactured by forging technology. It is strong and wear-resistant;
  • The measuring mechanism has no moving parts and will never wear out. The measuring accuracy is not affected by the service cycle;
  • Epoxy resin potting. Can work in water. Easy to install. Horizontal and vertical installation;

Extended Reading: Clamp on Water Flow Meter

3″ water meter flow rate

Caliber(mm)InchMeasurement grade Q3/Q1  
m³/h		Overload flow Q4
m³/h		Common flow Q3
m³/h		Boundary flow Q2
m³/h		Minimum flow Q1
m³/h		Minimum reading
m³		Maximum reading
5025031.25250.80.50.001999999
652½5050401.280.80.001999999
8035078.75632.0161.260.001999999
1004501251003.220.001999999
125– 502001605.123.20.001999999
150650312.5250850.019999999
20085050040012.880.019999999
2501050787.563020.1612.60.0199999999
30012501250100032200.199999999
35014501750140056350.199999999
40016502000160051.2320.199999999
50020503125250080500.199999999
600245060003000600900.199999999

3″ water meter dimensions

2 inch
Water Flow Meter
3 inch
Sewage Flow Meter
3 inch
Gas Flow Meter

Read more about: Flow Meter Selection Guide

3″ Water Meter Pressure Loss

The specifications of 3″ Water Meter are as follows:

Executive standardCJ/T224-2006
Measurement accuracy levelClass B
Temperature classT30, T50, T70, T90
Pressure LevelMAP10
Pressure loss level△P63
Maximum allowable errora) Low area (Q1≤Q<Q2) The maximum allowable error is ±5%
a) When the water temperature is ≤30℃, the high zone (Q₂Q<Q) is the largest
Allowable error is ±2% Q1 Q2
When the water temperature is ≥30℃, the high zone (Q₂QQ) is the largest
Allowable error is ±3% Q2 Q4
Electronic technical indicatorsBus power supply: external supply DC6.5V~18V
Working current: -5uA
Communication interface: RS-485 interface; MBUS interface
External power supply: 5~10V
technical standardThe technical parameters of this product conform to national standards
GB/T778.1~3-2007
(ISO464-1~3:2005IDT) regulations
The electronic device complies with Electronic Remote Water Meter”

The pressure loss level of the water meter is △p63, which represents the maximum pressure loss of 0.063MPa

Read more about Everything You Need To Know About Electronic Flow Meters

3″ water meter with pulse output

The pulse output water meter is a water meter with a very unique design.

It has the characteristics of passive signaling. A square wave signal can be output without a power supply. The distance reached one kilometer. And the transmitted signal is very accurate.

The water meter has a self-retaining function. Avoid more possibility of false signal. It can ensure that the signal has no errors.

Prevent all kinds of water theft from happening.

The service life is also very long, and the service life of the remote transmission part can be as long as ten years.

The water meter supplied by Sino-Inst can be configured with pulse output. When you place an order, please confirm with our sales engineer.

Extended reading: 2 inch Water Flow Meter

Water meter types

In addition to the water meter described at the top of this article. We also have many types of water meters. Such as turbine water meter. Ultrasonic water meter. Electromagnetic water meter, etc.

In addition to the water meter described at the top of this article. We also have many types of water meters. Such as turbine water meter. Ultrasonic water meter. Electromagnetic water meter, etc.

Extended reading: Advantages and disadvantages of ultrasonic water meters

The types of water meters can be divided by the principle of measurement, the common types are: 　　

a) Mechanical water meter:
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.　　

b) Mechanical water meter with electronic device:
The mechanical water meter with complete structure is retained, and the water meter with an electronic device is installed on this basis, mainly including IC card water meter and remote water meter.
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 into the calculator. Both the calculator and the indicating device are electronic components, such as a vortex (impeller) wheel electronic water meter.　　

Read more about: How does a residential water meter work?

c) Electronic 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: Chilled Water Flow Meter

More Water Flow Meters

Insertion Ultrasonic Water Flow Meter
Dual Channel Ultrasonic Water
In-Line Ultrasonic Flow Meter
Strap on flow meter X3
Ultrasonic Water Meter for Residential Water
Magnetic Water Flow Meter
Remote Magnetic Sewage Flow Meter
Turbine Sanitary flow meter
Turbine Pulse Flow Meter
Liquid Turbine Flow Meter

FAQ

The water meter is an instrument that measures the flow of water. Mostly it is the cumulative flow measurement of water.

What is the working principle of the water meter?
It’s actually very simple. Because the housing of the water meter is fixed. Its internal volume is fixed. And the water is flowing. It pushes an impeller to rotate. Whenever the impeller rotates, there is a constant volume of water flowing through.
Therefore, as long as the number of revolutions of the impeller is accumulated and multiplied by this constant volume, the total amount of water flowing through can be obtained.

  1. The diameter of the water meter should be determined according to the diameter of the installation pipeline. The installation position should avoid exposure, flooding, freezing and pollution, and it is convenient to disassemble and swipe.
  2. The water meter should be installed horizontally (display face upward).
  3. The sand, gravel, hemp and other sundries in the pipeline should be removed before new installation to avoid malfunction of the water meter.
  4. The direction of the arrow shown on the water meter should be consistent with the direction of water flow in the pipeline.
  5. If the water meter is installed at the water inlet of the boiler, it is necessary to prevent the return of hot water and steam from the boiler from damaging the internal parts of the water meter. It is best to install a check valve at the water outlet of the water meter.

Extended reading: Hot Water Flow Meters Improve Heating-Boiler System

The prices of water meters vary. The price of the water meter is mainly determined by the material, caliber, and function. For example, residential water meters. 3/4 inch, without special function, reference price USD95.00/pc.

For the specific water meter price, please contact our sales engineer for confirmation.

Extended reading: Featured Cheap flow meters for Sale

More Water Flow Measurement Solutions

Sino-Inst offers over 30 water meter products. About 50% of these are ulrtasonic flow meters. 40% are mechanical water meters.

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

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

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

Sino-Inst sells through a mature distribution network that reaches all 50 states and 30 countries worldwide. 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.