Digital Water Flow Meters

What is a digital water flow meter?

A Digital Water flow meter is a flow meter that can display the water flow rate, and have the output for the flow rate. Like 4-20mA output, HART, RS 485, and so on. Digital Water Flow Meter is also called Electronic Water Flow Meter. Digital Water Flow Meter is widely used in industrial water and household water measurement. Most of the Sino-Inst flow meters are digital water flow meters. Like the electromagnetic flowmeter, Portable ultrasonic flow meter, Turbine flow meter…..

The water flow meter is an instrument specially used to measure the flow of water in pipes. You can get many different types of water flow meters from your facility.

When used in certain applications, each flow meter has its own advantages. For many pipelines and similar systems, the water must be maintained at a specified flow rate to ensure the effective operation of the system.

At low flow rates, the speed of the water may be so low that suspended solids settle to the bottom of the pipe, which will deteriorate the efficiency of the pipe and eventually lead to the accumulation of contaminants, which can cause damage.

Since water flow meters can be used in a wide range of applications, there are many reasons to need these flow meters.

On the one hand, knowing that the fluid is in the right place at the right time is very beneficial to ensure that operating costs and efficiency are maintained.

These meters can also be used to ensure that fluids are kept in motion or to determine if the tank is properly balanced.

Any drop in the flow rate may indicate that the water quality is deteriorating and requires treatment.

In some applications, accurate flow measurement is critical to product quality and the health and safety of the final product. These meters are relatively easy to install in the pipeline, depending on the type of meter you choose.

Read more about: Water Meter

Featured Digital Water Flow Meters for Sale

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Water flow meter types

Water flow meters are flow meters that can diaplay the flow rate of industrial water pipe.

A water flow meter measures the amount of water flowing through a pipe. We have several kinds to choose from, depending on the application, maintenance needs, and budget.

Extended reading: 2 inch Water Flow Meter

There are four common water flow meter types:

Turbine (also called mechanical), Vortex, Ultrasonic, and Magnetic. We will tell you everything you need to know about them and help you choose one for your application.

First, you should know the flow meter working principles.

Flow Metering Principalples

  • Differential Pressure Flowmeters. Extended reading: Orifice Plate Flow Meter
  • Velocity Flowmeters
  • Positive Displacement Flowmeters
  • Mass Flowmeters
  • For Open Channel Flowmeters – weirs, flumes, submerged orifices, current meters, acoustic flow meters, and more

Read more about digital flow meters.

Types of water flow meters

Turbine/mechanical flow meter to measure water flow

Turbine flow meters easily become the most common flow meters around, mainly because these flow meters are more affordable than other types.

The mechanical flow meter measures the water flow through the rotation of the turbine, which uses a basic propeller, blade or split flow design. The flow rate of water is equal to the speed of the blades.

If mechanical flow meters are to be used, they may become clogged if the water is dirty or more contaminated than expected.

Therefore, you probably should not use this kind of flowmeter to measure the flow of slurry. Since these flow meters can become clogged, they are more frequently maintained than other flow meters.

Know more about: Turbine type Flow Meter for Liquid & Gas technology

Vortex flowmeter measures water flow

The vortex flowmeter is a unique flowmeter that measures the flow of water by using vortex flow.

When the fluid pushes over the obstacle, it will produce a vortex and form a vortex. The flowmeter is equipped with a sensor tab. As long as the vortex flows through the sensor tab, the tab will bend, which will produce a frequency output indicating the flow rate of the water.

If you decide to choose a multivariable vortex flowmeter, it can measure up to five different variables that are useful for your specific application.

These variables include mass flow, temperature, density, flow rate and pressure. These meters are especially suitable for large pipelines.

Extended Reading: Chilled Water Flow Meter

Ultrasonic flow meter to measure water flow

Ultrasonic flow meters are designed to use ultrasonic technology to measure the speed of water as it passes through the pipeline.

You should understand two basic types of ultrasonic flow meters, including runtime flow meters and clamp-on ultrasonic flow meters.

If you choose a run-time flow meter, send a standard ultrasonic signal downstream before sending another signal upstream. These two signals are then compared to determine the water flow rate. This is mostly a pipeline water flow meter. It is often used for household water.

For clamp-on ultrasonic flowmeters, can be placed outside the pipe and are designed to emit acoustic pulses through the pipe wall in order to receive the measured value. Since they can be installed outside the pipeline, they can be used for almost any application and can be used with larger pipelines.

Extended reading: Industrial VS Residential inline water flow meters

Electromagnetic flowmeter measures water flow

The electromagnetic flowmeter can measure the speed of water by using a simple magnetic field.

When water passes through a magnetic field, a voltage is generated. In this way, higher flow rates always generate more voltage when sent through the electromagnetic flowmeter. The electronic system connected to this meter will receive the voltage signal and convert it into volume flow.

Remember that the water needs ions to generate voltage, which means that the electromagnetic flowmeter cannot be used with pure water without pollutants.

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Read more about: Industrial flow meters for Different industrial applications

What is the difference between a flow meter and a water meter?

Flow meter usually refers to industrial flow meters. Water meter usually refers to residential water meter.

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

Industrial VS residential digital water flow meter

1. From a functional point of view. Industrial digital water flow meter mainly measures instantaneous flow. It is a real-time state. It can understand the usage of each site. And can output pulses, 4~20mA, etc. Residential digital water flow meter is mainly a cumulative function, generally cannot see instantaneous flow .

2. From the cost point of view. The manufacturing cost of the Residential Digital Water Flow Meter is relatively low. The cost of an Industrial Digital Water Flow Meter is generally relatively high.

Extended reading: Featured Cheap flow meters for Sale

3. In terms of quality. Relatively speaking, the Residential digital water flow meter has poor accuracy. It cannot withstand high pressure and high temperature, and cannot output linear signals. It cannot participate in the automation control of modern industry. The industrial digital water flow meter can do the above.

4. From the point of view of usage. Residential digital water flow meter only measures water and is not used to measure gas. And some liquid media water meters cannot be used. Industrial digital water flow meter liquids (water, oil, turbid liquids, etc.) can be measured.

Of course, Residential digital water flow meters can realize various functions such as prepayment. Remote data transmission. Remote valve control. Step water pricing, etc. It is a must-use metering product for residential homes.

Extended reading: Liquid Mass Flow Meter

Read more about: What is a Flow Meter? Types and how does it work?

How do you measure the speed of the water?

Normally, like the Domestic water, industrial water, raw water, ground water, urban sewage, industrial wastewater, the processed neutral pulp, pulp slurry, etc.

We need to know the flow rate. We know the flow, we can analyze the water flow, control the flow, and so on.

For industrial water, most time is in the pipeline. Sometimes in the open channel.

  • For pipe flow measurement, we can install a flow meter on the pipe.
  • If the pipe can be changed, we can install a pipe flow meter or a flange to mount.
    • Electromagnetic flowmeters, turbine flowmeters, are all installed in this way.
  • If the pipe diameter is large, we can choose to install a plug-in electromagnetic flowmeter at a lower cost.
  • If the pipe cannot be changed, we can install the ultrasonic flowmeter, which is convenient and quick.
  • For open channel flow measurement, we can specialize open channel flowmeters. If you need to purchase an open channel flowmeter, you can contact us to customize it according to your requirements.

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

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Sino-Inst offers over 30 water flow meter products. About 50% of these are differential pressure flow meters. 40% are water meters (like the Insertion Turbine Flow Meter), and 40% are water treatment (like the Annubar flow meter ).

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

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

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

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

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Industrial flow meters

Flowmeters for Industrial Flow Measurement

The industrial flow meter is one of the most important instruments in industrial measurement. In industrial sites, instruments that measure fluid flow are collectively referred to as flow meters or flow meters. There are very many kinds of flow meters. Based on years of experience, Sino-Inst has compiled the following information. Hope it can help you choose the right industrial flow meter.

Flow Measurement is the process of measuring fluid in your plant or industry. Sino-Inst offers industrial flow meters, with local LCD reading, transmitter, and optical set points. You can measure flow through a variety of different devices, such as Coriolis, differential pressure, vortex, magnetic, ultrasonic, turbine, and positive displacement meters. Industries like: gas flow, airflow, wastewater ( sewage ), pipe (like 4 inches), and etc.

If you need to know the flow rate in you pipe, or river, that when you need a flow meter. So, flow meter is the instrument that can finish the flow measurement.

Flowmeters consist of a primary device, transducer and transmitter.

The transducer senses the fluid that passes through the primary device.

The transmitter produces a usable flow signal from the raw transducer signal.

These components are often combined, so the actual flowmeter may be one or more physical devices.

Different types of flow meters are available for different applications, and depending upon the requirement, a careful selection of flow meters is made.

For e.g., we prefer vortex flow meters to flow steam flow measurement. And we like the ultrasonic flow meters for non-contact pipe flow measurement.

Industrial flow meters Types

Magnetic Flow Meters

Magnetic flow meter is also called electromagnetic flow meter, mag flow meter or magmeter. Suitable for the measurement of conductive liquids.

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.

Precession Vortex Gas Flowmeter

Precession vortex flowmeter is a new type of gas flowmeter. It can be used for the measurement of natural gas, propane, air, nitrogen and other gases.

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.

Ultrasonic Gas Flow Meters

Ultrasonic Gas Flow Meter uses the principle of measuring the transit time of ultrasonic waves in the pipeline. Ultrasonic Gas Flow Meter is an ideal choice for various gas measurements.

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.


Sewage flow meter, also known as waste water flow meter. The sewage flow meter measures the flow of various sewages in pipes and open channels. Common sewage flow meters are magnetic flow meters, non-contact ultrasonic flow meters, etc.

Industries like the waste water, river water, industrial gas.

Read more about: Sewage Flow Meters

The air conditioning system is a control system that includes temperature, humidity, air clarity and air circulation, and is called HVAC (: Heating, Ventilation, Air-conditioning and Cooling).

The principle is similar to that of an air conditioner supplying cool air, heating air or dehumidification. The use of refrigerant under the action of the compressor. Produces evaporation or condensation. Then trigger the evaporation or condensation of the surrounding air, in order to change the purpose of temperature and humidity.

Air mass flow meter & Controller is commonly used in HVAC industry.

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Air mass flow meter VS Controller

Digital air flow meters

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

Read more about: Chilled Water Flow Meter

Clean Water can be measured using a variety of flow meters. Commonly used are electromagnetic flow meters and ultrasonic flow meters, etc.

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Extended reading: Industrial Magmeters

The irrigation flow meter is a flow meter designed for agricultural irrigation water counting. Agriculture, horticulture, etc. require water for irrigation. And water is becoming more and more expensive. The installation of flow measurement devices allows for effective monitoring and management of agriculture water systems.
The old mechanical water meters and today’s ultrasonic flow meters and electromagnetic flowmeters are widely used.

Read mroe about: Irrigation Flow Meters for Agriculture Water System

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.

Read more about:

Industrial Oil Flow Meters

Hydraulic Oil Flow Meters

Diesel Fuel Flow Meters

Chemical flowmeters are used to measure flow rate that flow through them. You may often hear about ultrasonic flow meters, electromagnetic flow meters, turbine flow meters, volumetric flow or mass flow. Chemical flow meters are common in industries like petrochemical plants and refineries. And play a vital role in the manufacturing process since they help to enhance manufacture efficiency.

Read more about: Chemical Flow Meter Guide

Common sanitary flow meters are sanitary magnetic flow meter and sanitary turbine flow meter. Composed of 304/316 stainless steel. Sanitary flowmeter with Tri-Clamp fittings is easier to install and disassemble. Suitable for food hygiene industry.

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Digital Beer Flow Meters

Marine fuels mainly include light diesel, heavy diesel, fuel oil, and residual fuel oil.

To put it simply, if the tested marine fuel is a low-viscosity, clean fuel. Then you can choose a turbine flowmeter. The price is reasonable and the measurement is stable.

If the marine fuel being tested is heavy oil, high-viscosity fuel. Then it is recommended to choose an oval gear flowmeter.

If the measured marine fuel is a small flow rate. Then it is recommended to use a circular gear flowmeter for measurement.

If the tested marine fuel has impurities. It is recommended to install a filter before the flowmeter.

If you still do not know how to choose the right marine fuel flow meter. You can contact our sales engineer. We will provide you with a suitable marine fuel flow measurement program.

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Large-diameter Oval Gear-Marine Fuel Flow Meter

Industrial petrol flow meters|Selection Guide

The hydraulic flow meter is mainly for inline hydraulic system instantaneous flow test and high-pressure test. Industrial Hydraulic oil flow meter, also called hydraulic flow gauge.

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

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Hydraulic Oil Flow Meters

Commonly used Cryogenic Flow Meters include cryogenic turbine flow meters, orifice flow meters, mass flow meters, target flow meters, etc. Representative cryogenic fluids include LNG (liquefied natural gas), LN2 (liquid nitrogen), LO2 (liquid oxygen), liquefied ethylene, liquid hydrogen, liquid chlorine and these cryogenic gases. LPG (liquefied petroleum gas) is not included in the cryogenic Fluid.

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Refrigerant Flow Meter

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

Application of flow meter in industry

Selecting the right industrial flow meter for your application can be a challenging task. To make it easy, Sino-Inst recommends the best flow meter you should use for your particular gas, liquid, or steam flow application. First, choose your application:

  • Natural gas
  • Compressed air measurement
  • Gas mixing and blending applications
  • Burner control
  • Liquid measurement
  • Steam flow measurement

Based on your application specifications, such as flow rate, pipe size and gas measured, we help you select the perfect flow meter solution for your industry,to improve quality and save money on energy costs, installation, and maintenance.

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

Sino-Instrument is a leading supplier of industrial flow meters, with experience in the design and application of various flow technologies.

To request a quote for industrial flow meters for your application, contact us for more information.

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Remote Magnetic Sewage Flow Meter

Sewage Flow Meter is an electromagnetic flow meter used to measure sewage/waste water. Also called Effluent flow meter, or wastewater flow meter.

Sewage Flow Meter application for water flow rate measurement, in those wastewater treatment industrial pipes. The water and sewage treatment industry plays an important role in providing high-quality water supply. In the water treatment process, no matter it is water inlet, transportation, drainage and other processes, the flow needs to be measured. Therefore, the choice of flowmeter is particularly important.

Sewage has the characteristics of large flow rate changes, impurities, high corrosiveness, and certain conductivity. Electromagnetic flowmeter has the advantages of wide range, simple structure, no moving parts, and can measure dirty and corrosive media. Therefore, in the sewage treatment industry, electromagnetic flowmeters are widely used. Here you can find the right sewage flow meter to measure the flow of wastewater for your application.

Sino-Inst offers a variety of  Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.

Features of Remote Magnetic Sewage Flow Meter

  • Electromagnetic flowmeter is an instrument for measuring volumetric flow. Flow measurement is not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. The sensor induced voltage signal has a linear relationship with the average flow rate, and the measurement accuracy is high.
  • There are no obstructions and moving parts in the measuring tube, which will not cause additional energy loss or blockage. Therefore, the energy-saving effect is significant, and it is especially suitable for the measurement of liquid-solid two-phase flow such as sewage, mud, mineral pulp, coal water slurry, paper pulp, etc.
  • The electromagnetic flowmeter has no mechanical inertia and is sensitive. It can measure instantaneous pulsating flow and has good linearity.
  • Installation requirements are low. The straight pipe section required by the sensor is relatively short, generally the first 5D and the rear 3D (D is the inner diameter of the selected instrument).
  • The sensor part only has the lining and the electrode in contact with the medium. As long as the electrode and the lining material are selected reasonably, it can resist corrosion and abrasion, ensuring long-term use.
  • When the power is off, the EEPROM can protect the set parameters and accumulated values.
  • The converter uses a low-power single-chip microcomputer to process data. It uses SMD electronic components and surface mount SMT technology. Reliable performance, high precision, low power consumption, and zero point stability. LCD display, display cumulative flow, instantaneous flow, flow rate, flow percentage and other parameters.
  • It adopts multi-electrode structure with high accuracy. Equipped with ground electrode, no grounding ring is needed, which saves cost.
  • The low-frequency rectangular wave excitation improves the stability of the flow. The power loss is low and the low flow rate is superior.
  • Two-way measurement system. It can measure forward flow and reverse flow.

Specifications of Remote Magnetic Sewage Flow Meter

CaliberDN 10 ~ DN2000 (3/8″…80″)
Excitation methodSquare wave constant current excitation
Installation formOne-piece flange, split flange
liningNeoprene, polyurethane rubber, PTFE, F46
Electrode material316L, Hc, Hb, titanium, tantalum, platinum iridium, tungsten carbide
GroundBuilt-in ground electrode (DN25 and above)
MediumConductive liquid
level of accuracy0.5, 1.0
Dielectric conductivity> 5 μS/cm
Flow rate≤ 10 m/s
Pipe connection flangeGB 81~59
Pipe connectionFlange connection
Medium temperatureChloroprene rubber: -10℃~60℃; PTFE: -10℃~120℃
Polyurethane rubber: -10℃~80℃; F46: -10℃~150℃
preset pressure4.0 MPa; 1.6 MPa; 1.0 MPa
Protection levelIP65; IP68
output signal4mA ~ 20mA DC current; pulse/frequency; upper and lower limit alarm
Cable interfaceM20×1.5 internal thread
CommunicationRS 485 communication protocol (modbus protocol)
RS 232 communication protocol (optional)
DisplayInstantaneous flow, alarm display, percentage, flow rate, forward and reverse cumulative flow and total cumulative
power supply220V AC, 24V DC, 3.6 V battery power supply
Use typeOrdinary type, waterproof type
High pressurecustom made

Read more about: Digital Water Flow Meters

Electromagnetic Flow Meter for Sewage

According to the situation of the wastewater treatment site, there are two general wastewater discharge methods. One is to discharge through pipes, and the other is to discharge through ditches. The two types of flow meters selected are therefore different.

1.Waste water is used for pipeline discharge, and most of them choose electromagnetic flowmeter to measure. Because there are no obstructions in the sensor, there is no fear of debris in the medium.

But need to pay attention to the medium must be full. If the pipe is not full, a pipe must be used to lead a section of the sinking pipe to ensure that the flowmeter is in a full pipe.

Note that the electromagnetic flowmeter cannot be installed at the drain of the pipeline, and the length of the straight pipe must meet the requirements of the flowmeter.

Extended Reading: Guide: Magnetic Flowmeter Installation

2.Wastewater is used for ditch discharge, mostly using ultrasonic open channel flow meters.

A measuring groove is installed at the discharge port, and an ultrasonic probe is installed directly above the groove. In this way, the flow of wastewater flowing through can be measured. This instrument generally uses 24V power supply, output: 4-20MA.

When selecting the electromagnetic flowmeter for waste water, it is necessary to know the temperature of the medium, the pressure of the medium, the flow range of the medium, the composition of the medium, the power supply requirements, and the on-site installation requirements. The key point of the selection is to choose which product to measure well. The second is to consider the convenience of installation, operation and maintenance. Finally, the product price can be considered.

Read more about: Sewage flow meters|Waste water measurement

Wastewater/Sewage Flow Meter Calibration

A flow meter’s deviation from the standard can be measured in two ways: with a master meter or by weighing mass flow.

Master meters are calibrated to peak accuracy by specified, accredited laboratories.

These labs are ones that are certified by the National Institute of Standards and Technology (NIST). Subsequently, this means that flow meters. Which are calibrated to master meter accuracy in such a lab will be backed by NIST certification and traceability.

The second method of flow meter calibration involves weighing the amount of fluid that flows through the meter, during the calibration procedure. This is typically done using a supremely accurate weigh scale, which must also be approved by NIST.

This method is often regarded as the most accurate way to measure the volume of flow.

Flow meters can also be calibrated in the field, also known as “wet” calibration.

However, this method is frequently scrutinized because it lacks the involvement of national standards.

Additionally, field calibrations are usually not an option in most applications. Because challenging an installed flowmeter with a given volume of water is just not practical.

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Featured Sewage Flow Meters

Sino-Inst offer over 20 Sewage flow meters, with Best Price.

A wide variety of Sewage 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 Handheld ultrasonic flow meter, and others are Liquid Turbine Flow Meters.

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

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Insertion Magnetic Flow Meter

Insertion Magnetic Flow Meter, also called insertion electromagnetic flow meter, is an insertion type flow meter. Insertion magnetic flowmeter can be installed without stopping the flow. Suitable for large diameter DN300-3000.

Insertion Magnetic Flow Meter adopts pressure tapping and installation technology. Insertion electromagnetic flow meter is composed of insertion electromagnetic sensor and electromagnetic flow converter.

Installation can be divided into an online installation type of the cut-off valve, and water control installation type without stop valves. The Insertion Magnetic Flow Meter is suitable for measuring the volume flow of various conductive liquids in the pipeline. It can also be used to measure corrosive conductive liquids such as acid, alkali and salt.

Sino-Inst offers a variety of  Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.

Features of Insertion Magnetic Flow Meter

Compared with the pipe segment electromagnetic flowmeter, the advantages of Insertion Magnetic Flow Meter:

  1. No need to cut off the water, cut off the pipeline, install directly on the old pipeline;
  2. Easy to disassemble during maintenance;
  3. Especially suitable for large-diameter pipelines, with high cost performance;
  4. The accuracy is lower than the flange type, and it is mostly used for process control rather than measurement;
  5. It can be made into one-piece or component pose;
  6. The Insertion electromagnetic structure can be easily installed and disassembled without stopping the water under low pressure or under pressure. Therefore, it is very suitable for the fluid measurement of existing pipelines and facilitates the maintenance and repair of instruments.
  7. The measurement accuracy is not affected by changes in physical parameters such as the temperature, pressure, density, viscosity, conductivity (as long as the conductivity is greater than 20μs/cm) of the measured medium.
  8. The sensor has almost no pressure loss and extremely low energy loss.
  9. Large flow measurement range. The full-scale flow rate in the measured pipe can be set arbitrarily from 1m/s to 10m/s, and the output signal has a linear relationship with the flow rate.
  10. The flowmeter not only has 0~10mA or 4~20mA standard current output, but also 1~5kHz frequency output

Specifications of insertion electromagnetic flowmeter

Medium Water, sewage water, acid, alkali, etc.    
Diameter Dn300~DN3000mm    
Accuracy ±2.5%    
Temp. range -20~+150℃    
Pressure 1.6 MPa    
Flow rate 0.5~6m/s    
Straight pipe required Upstream≥5DN, downstream≥3DN    
Electrode 316L,Hastelloy C(HC), Titanium(Ti), Tantalum(Ta),Platinum(Pt)    
Installation way Without a ball valve or with a ball valve    
Body material Stainless steel    
Power supply 220VAC/24VDC/Lithium battery    
Signal output Pulse output, 4~20mA    
Communication RS485,Hart, GPRS etc.    
Explosion-proof No    
Protection class IP65(compact type), IP68(remote type)    
Working environment Temp. Range: -20~+60℃,  humidity: 5%~90%    

Applications of Insertion Magnetic Flow Meter

  • Potable Water
  • Water Distribution
  • Pumping Stations
  • Filter Balancing and Backwash
  • Reclaim Water
  • Treated Water
  • Irrigation Water
  • Cooling Water
  • Raw Water

Extended reading: 2 inch Water Flow Meter

Insertion magnetic flow meter principle

All MAG Meters operate under the same fundamental principle of classical physics (Faraday’s Law of Electromagnetic Induction):

E = CONSTANT x B x D x V

The law states that the magnitude of the voltage (E) induced in a conductive medium, moving through a magnetic field is directly proportional to the strength of the magnetic field (B), the path length between the probes (D), and the velocity of the medium (V).

In principle and implementation, it is possible to fix all parameters except velocity.

Thus a MAG Meter responds only to “velocity” and is extremely insensitive to changes in fluid conditions (density, viscosity, etc.) and application constraints (pressure, temperature, and mechanical vibrations, as well as fluid pulsation).

The operation of a MAG Meter is completely analogous to an electrical generator.

A voltage is induced in a conductor that is moving at right angles through a magnetic field.

The faster the conductor moves, the more voltage is generated.

You may want to know more about: Magnetic Flow Meters technical guide|What is &How they work? 

Advantages of Magnetic Flowmeters

Electromagnetic (MAG) flowmeters have been widely used in industry for over 50 years.

And for good reason, the advantages of MAG meters are irrefutable.

  • High reliability – no moving parts
  • No scheduled maintenance
  • Good accuracy: 0.5% to 2.0% of reading
  • Very wide range: up to 100:1
  • No pressure drop
  • The wide selection of materials
  • The wide selection of fluids metered

Extended reading: Industrial Magmeters

Typical Installation of Insertion Magnetic Flow Meter

Easy To Install

  1. Place saddle and ball valve
  2. Hot tap
  3. Insert meter and set the depth
  4. Tighten clamp
  5. Provide electrical Ground connection on plastic pipes

Extended Reading: Special Magnetic Flowmeter Installation situation

Choice of installation environment

  1. It should be installed at the lower part of the horizontal pipeline and vertically upwards, avoid installing at the highest point of the pipeline and vertically downwards;
  2. It should be installed on the rising part of the pipeline;
  3. Installation in the open discharge pipe should be installed at the lower part of the pipe;
  4. If the pipeline drop exceeds 5m, install an exhaust valve downstream of the sensor;
  5. The control valve and shut-off valve should be installed downstream of the sensor, not upstream of the sensor;
  6. The sensor must not be installed at the inlet and outlet of the pump, it should be installed at the outlet of the pump.
  7. Keep away from equipment with strong fields, such as large motors and large transformers.
  8. There should be no strong vibration in the installation place, and the pipeline should be firmly fixed. The ambient temperature should not change much.
  9. The installation environment should be easy to install and maintain.

Choice of installation location

The installation location must ensure that the pipeline is always filled with the fluid under test.
Choose a place where the fluid flow pulse is small, that is, away from the pump, valves, elbows and other local resistance parts.

When measuring two-phase (solid, liquid or gas, liquid) fluids, choose a place that is not easy to cause phase separation.

Avoid negative pressure at the measurement site.

The diameter or circumference of the side pipe is easy to measure, and the ovality should be small.

Length of straight pipe

The length of the straight pipe section on the upstream side of the sensor installation pipeline should be greater than or equal to 10D, and the downstream side should be no less than 5D (D is the diameter of the pipeline being tested).

The flow control valve should be installed on the pipe under test on the upstream side of the sensor, and the flow control valve should be installed on the downstream side of the sensor. When measuring, usually the flow control valve should be fully open.

Installation method

Vertical installation, when the sensor is inserted into the pipeline, it should be perpendicular to the central axis of the pipeline, and the included angle with the pipe section is less than 50. It is suitable for measuring clean media with small pipeline vibration.

There are two ways to insert the insertion point of the electromagnetic flow sensor. One is to insert at 1/4 of the inner diameter of the pipe. The other is to insert at 1/2 of the inner diameter of the pipe.

Correctly weld the mounting base to the pipe. Clean up welding slag and burrs on the mounting base of the pipe under test.

Turn off the upstream flow control valve or use a low-pressure water supply.

Install the DN50 ball valve on the mounting base. Note that the long cavity of the ball valve faces upwards. Check whether the ball valve can be fully opened and closed. If there is any problem, repair it. Install the compression threaded seat, compression nut and rubber sealing ring on the ball valve. Loosen the positioning screw and the compression nut, and insert the sensor through the ball valve into the pipe under test. Tighten the compression nut and the positioning screw, and at the same time, pay attention to the insertion direction of the sensor direction sign and the fluid flow direction.

Insertion depth

(1) When selecting the electrode to insert to the average flow rate, the average flow rate point is about H=0.25D from the pipe wall (D: pipe inner diameter) according to the pipeline turbulent flow conditions. Press the handle to make the insertion rod enter the pipe H deep. (L2 at this time = original L2-H)

(2) After confirming that the insertion depth is correct, turn the flow direction rod to make its connection parallel to the centerline of the pipeline. At this time, the connection between the two electrodes will be perpendicular to the centerline of the pipeline. That is, the connection between the electrodes is perpendicular to the flow rate.

(3) After adjustment, first tighten the lock nut firmly, and then tighten the three locknuts separately. One of their functions is to ensure that the insertion rod is not pushed out by the pressure in the tube. The other is to ensure that the insertion rod does not vibrate.

(4) During actual on-site installation, the insertion depth is only allowed to be 0.25D, which is a quarter of the diameter of the pipe. The insertion depth is 0.5D, which is the center of the pipe.

(5) Loosen the fastening screws under the junction box. Rotate the junction box to the position you are satisfied with and tighten the nuts.

The Insertion flowmeter is a type of flowmeter divided by structure. It includes various flowmeters with different working principles.

Usually, the flowmeter and the pipeline are flanged. Only when the processing pipeline is cut off is allowed to be disassembled, repaired, and replaced. This has a great impact on the reliable operation of the system. The Insertion flowmeter fundamentally solves this defect. Although the measurement accuracy is slightly lower. But on some large-caliber occasions, Insertion flowmeters have been used to measure the total amount of fluid.

There are many forms of Insertion flowmeters that have been promoted. According to the working principle of Insertion flowmeter detection heads, they can be divided into Insertion turbine, Insertion vortex, Insertion electromagnetic, uniform velocity tube, and thermal flowmeter. The number of measuring points of the Insertion flowmeter can be divided into two categories: point flow type and runoff type.

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

More Featured Insertion flowmeters

At present, there are many kinds of Insertion flowmeters in use. According to the working principle of the Insertion flowmeter detection head, it can be divided into Insertion turbine, Insertion vortex, Insertion electromagnetic, Insertion ultrasonic, and Insertion target flowmeter.

The correct choice of the flowmeter is of great significance for flow measurement. Choosing different flow meters under the same working conditions will definitely have a considerable difference in the final measurement results.

If the initial selection is improper, it may even lead to the inability to perform quantitative measurements and cause damage to the instrument. Therefore, it is necessary for users to have a correct understanding of how to choose a suitable flow meter. Knowing some basic selection methods will help make mistakes when choosing meters.

In order to ensure the use of the flow meter in the production site process. The choice of flowmeter, in general, must be determined according to the medium that needs to be measured at the production site.

The advantages of the insertion vortex flowmeter are particularly good anti-vibration performance, no zero drift, and high reliability. Through a large number of waveform analyses and frequency spectrum analyses on the vortex flowmeter for a long time, the probe shape, wall thickness, height, probe rod diameter, and matching piezoelectric crystals are designed.

Insertion Vortex Flow Meter

It adopts an advanced numerical control lathe for processing. It ensures the coaxiality and smoothness of processing and other technical parameters and cooperates with special processing. It overcomes the common problem of the influence of the inherent self-oscillation frequency of the vortex flowmeter on the signal.

The insertion vortex flowmeter is mainly used for the flow measurement of large-caliber gas, liquid, and steam medium fluids in industrial pipelines in various industries.

It is characterized by small pressure loss, a large measuring range, and high accuracy. It is almost not affected by fluid density, pressure, temperature, viscosity, and other parameters when measuring volume flow under working conditions.

Insertion ultrasonic flowmeter can be divided into propagation velocity difference method (direct time difference method, time difference method, phase difference method and frequency difference method), beam shift method, Doppler method, and cross-correlation method according to the principle of signal detection. , Spatial filtering method and noise method, etc.

Ultrasonic Insertion Flow Meter

Ultrasonic flowmeters are the same as electromagnetic flowmeters. Because the flow channel of the instrument is not equipped with any obstructions, it is an unobstructed flowmeter. It is a type of flowmeter suitable for solving difficult problems in flow measurement. Especially in large-caliber flow measurement. The advantages.

Insertion ultrasonic flowmeter is mainly used in petroleum, chemical industry, metallurgy, electric power, water supply, and drainage, and other fields.

The structure of the Insertion turbine flowmeter is an explosion-proof design. It can display the total flow, instantaneous flow, and the percentage of flow full scale. The battery adopts a long-term lithium battery. The battery life of a single-function integrator can reach more than 5 years, and the battery life of a multi-function indicator can reach more than 12 months.

Turbine Insertion Flow Meter

Insertion turbine flowmeter can display many flow units, including cubic meters, gallons, liters, standard cubic meters, standard liters, etc. The fixed pressure and temperature parameters can be set to compensate for the gas. For occasions where the pressure and temperature parameters do not change much, the instrument can be used for fixed compensation accumulation.

Insertion turbine flowmeters are mainly used in metering and control systems in the fields of petroleum, chemical industry, metallurgy, scientific research, and so on.

The Insertion target flowmeter is based on the traditional target flowmeter. With the development of new sensors and microelectronics technology, a new type of capacitive force induction flow Insertion target flowmeter has been developed. It has the characteristics that the flowmeter has no movable parts such as an orifice plate and vortex street. At the same time, it has high sensitivity and accuracy comparable to positive displacement flow meters. The measuring range is wide.

Target Flow Meter

Insertion target flowmeter has good adaptability in the working conditions of small flow, high viscosity, easy to condense and easy to block, high and low temperature, strong corrosion, strong vibration and other flow measurement difficulties. Mainly used for flow measurement in various fields such as metallurgy, petroleum, chemical industry, energy, food, and environmental protection.

More Featured Wastewater Flow Meters

More about: Sewage Flow Meter Selection

Sino-Inst offers all kinds of flow meters, which can work for the wastewater.

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Sino-Inst offers 10 Insertion Magnetic Flow Meters. A wide variety of  Industrial flow meters options are available to you. such as free samples, paid samples.

Sino-Inst is an Industrial flow Transmitter supplier, located in China. The top applying countries are China (Mainland), Hong Kong, and the United States, which supply 96%, 2%, and 1% of wireless pressure transmitters respectively.

Insertion Magnetic Flow Meter products are most popular in North America, Domestic Market, and South America. You can ensure product safety by selecting from certified suppliers, with ISO9001, and ISO14001 certification.

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Differential Pressure Flow Meters

Differential Pressure (DP) Flow Meters Technology –
Reliable Flow Solutions Across Many Applications

Differential Pressure Flow meters, also known as DP flow meters. Differential Pressure (DP) flow meters introduce a constriction in the pipe, that creates a pressure drop across the flow meter.

The calculation of fluid flow rate, by reading the pressure loss across a pipe restriction, is the most used flow measurement technique in industrial applications.

Differential pressure flow meters are suitable for water flow measurement, oil, steam or gas flow measurement.

According to different flow senor structures, we have:

  • Orifice Plate Flowmeters;
  • Venturi Flowmeters;
  • Nozzle Flowmeters;
  • Wedge Flowmeters;
  • Annubar Flowmeter

And more.

What is a differential pressure flow meter?

You can take this as the definition of the differential pressure flow meter.

Differential pressure flow meters, also known as DP flowmeters, create a cross-sectional change in the flow tube, which causes the velocity of the flowing fluid to change.

A change in velocity occurs whenever there is a change in flow cross-section; ie, With a decrease in velocity, an increase in pressure occurs.

Differential pressure flow meters can be used as liquid flowmeters or gas flowmeters; however, a single flow meter may not be configured to measure both liquid and gas phases.

Differential pressure (also known as throttling) Flow meters, are based on the throttling principle of fluid flow. It is one of the most mature and most commonly used methods for measuring flow in production. It is usually composed of a throttling device, which capable of converting the measured flow into a differential pressure signal, and a differential pressure gauge, and a display instrument, capable of converting the differential pressure into a corresponding flow value.

In the unit combination meter, the differential pressure signal generated by the throttling device, is often converted to a corresponding standard signal (electrical or pneumatic), by a differential pressure transmitter for display, recording or control.

The differential pressure flow meter is composed of a primary device (detection member), and a secondary device (a differential pressure converter and a flow display instrument).

Types of flow meter

The differential pressure flow meter is usually classified in the form of a test piece, such as an orifice flowmeter, a venturi flowmeter, a constant velocity tube flowmeter, a pitot tube principle-Pitoba flowmeter, and so on.

The secondary device is a variety of mechanical, electronic, electromechanical integrated differential pressure gauges, differential pressure transmitters and flows display instruments.

It has developed into a large-scale instrument with a high degree of categorization (series, generalization, and standardization) and a wide variety of specifications.

It can measure flow parameters as well as other parameters (such as pressure, level, density, etc.).

You may like the pressure level transmitter.

How does a differential pressure flow meter work?

Differential pressure flow meters use Bernoulli’s equation, to measure the flow of fluid in a pipe.

Differential pressure flow meters introduce a constriction in the pipe, that creates a pressure drop across the flowmeter.

When the flow increases, more pressure drop is created. Impulse piping routes the upstream and downstream pressures of the flowmeter to the transmitter, that measures the differential pressure to determine the fluid flow.

This technology accounts for about 21% of the world market for flow meters.

Bernoulli’s equation states that the pressure drop across the constriction is proportional to the square of the flow rate. Using this relationship, 10 percent of full-scale flow produces only 1 percent of the full-scale differential pressure.

At 10 percent of full-scale flow, the differential pressure flowmeter accuracy is dependent upon the transmitter, being accurate over a 100:1 range of differential pressure.

Differential pressure transmitter accuracy is typically degraded, at low differential pressures in its range, so flowmeter accuracy can be similarly degraded.

Therefore, this non-linear relationship can have a detrimental effect on the accuracy, and turn down of differential pressure flow meters.

Remember that of interest is the accuracy of the flow measurement system — not the accuracy of the differential pressure transmitter.

Different geometries are used for different measurements, including the orifice plate, flow nozzle, laminar flow element, low-loss flow tube, segmental wedge, V-cone, and Venturi tube.

Read more about: Shop 101: Key Factors In Selecting A Pipe Flow Meter

Differential pressure flow meter formula:


  • points 1 and 2 lie on a streamline,
  • the fluid has constant density,
  • the flow is steady,
  • and there is no friction.

Although these restrictions sound severe, the Bernoulli equation is very useful, partly because it is very simple to use. And partly because it can give great insight into the balance between pressure, velocity, and elevation.

To learn more about DP Flow:

Extended reading: Smart Differential Pressure Transmitter

Advantages and disadvantages of differential pressure flow meter

The upside of this technology is low cost, multiple versions can be optimized for different fluids and goals, are approved for custody transfer (though it is being used less and less for this). It is a well-understood way to measure flow. And it can be paired up with temperature/pressure sensors, to provide mass flow for steam and other gasses.

Negatives are that rangeability is not good due to a non-linear differential pressure signal (laminar flow elements excepted), accuracy is not the best and can deteriorate with wear and clogging.

Advantages and disadvantages of throttling differential pressure flow meter (orifice flowmeter)


1) The standard orifice plate structure of the throttle piece is easy to copy, simple, firm, stable and reliable in performance, long in service life and low in price;    

2) The throttling application range is extremely wide. All single-phase fluids, including liquid, gas, and steam, can be measured. Some mixed-phase flows, such as gas-solid, gas-liquid, liquid-solid, etc. can also be applied. General production processes and pipe diameters, The working condition (pressure, temperature) has products;    

3) All accessories can be used by all manufacturers if it is an international standard and can be used without calibration.


1) The repeatability and accuracy of the measurement are medium levels;    

2) The range is narrow because the meter signal and the flow rate are squared, the general range can only reach 3:1 ~ 5:1;    

3) The requirements for on-site installation conditions are relatively high. If a long straight pipe section is required, it is difficult to meet;    

4) The pressure piping is a weak link, which is prone to leakage, blockage, freezing and signal distortion;    

5) The pressure loss is large.

Extended reading: Integral DP Flow Meter|Gas, liquid, steam|Compact structure

What is the relationship between flow and differential pressure?

Differential pressure use Bernoulli’s equation to measure the flow of fluid in a pipe.

Differential pressure flow meters introduce a constriction in the pipe, that creates a pressure drop across the flowmeter.

When the flow increases, more pressure drop is created.

y+P(x)y =Q(x)y^n (equation)

is called a Bernoulli differential equation where n is any real number.

The graph below shows the resulting pressure drop for water at 60 F, over a range of flow rates for a 100-foot long pipe, for both 4 inches and 6-inch schedule 40 piping.

the relationship between flow and differential pressure

If you need, you can learn more about Flow Rate And Pressure Relationship.

How to Select a Flow Meter?

The basis of good flow meter selection is a clear understanding of the requirements of the particular application.

Therefore, time should be invested in fully evaluating the nature of the process fluid and of the overall installation.

  1. What is the fluid being measured by the flow meter(s) (air, water, etc…)?
  2. Do you require rate measurement and/or totalization from the flow meter?
  3. If the liquid is not water, what viscosity is the liquid?
  4. Is the fluid clean?
  5. Do you require a local display on the flow meter or do you need an electronic signal output?
  6. What are the minimum and maximum flow rate for the flow meter?
  7. What are the minimum and maximum process pressure?
  8. What are the minimum and maximum process temperature?
  9. Is the fluid chemically compatible with the flow meter wetted parts?
  10. If this is a process application, what is the size of the pipe?

Types of Differential Pressure Flowmeters

Flat metal plate with an opening in the plate installed perpendicular to the flowing stream in a circular pipe.

As the flowing fluid passes through the orifice, the restriction causes an increase in velocity and a decrease in pressure.

A differential pressure transmitter is used to measure pressure between the orifice and the pipe flow stream. 

There is always a permanent pressure loss. No dirty liquids allowed.

Orifice differential pressure flowmeters can be constructed to measure gas, liquid or steam.

Orifice plates are primary flow elements which measure flow as a function of differential pressure.

A restriction with a relatively long passage having a smooth entry and exit.

A venturi produces less permanent pressure loss than an orifice but is more expensive.

They are often used in dirty streams because there is no build-up of the foreign material.

Venturi flow meters can be constructed to be either gas flowmeters or liquid flow meters.

Extended reading: What Is A Venturi Flow Meter?

Smooth entry and sharp exit. Permanent pressure loss is on the same level as an orifice, with the added ability to handle dirty and abrasive fluids.

A differential pressure transmitter is used to measure pressure between the nozzle and the pipe flow stream.

This type of differential pressure flowmeter technology can be constructed to measure either gas or liquids.

Extended reading​: What is a flow nozzle?

A device consisting of a Pitot tube and an annubar tube combined with static pressure ports.

The differential pressure between the two ports is the velocity head.

A differential pressure transmitter is used to measure pressure differential between the two ports.

This indication of velocity combined with the cross-sectional area of the pipe provides an indication of flow rate. 

Pitot tube flow meters can measure either liquids or gases.

Differential pressure is caused by centrifugal force between the inside diameter and the outside walls of the pipe elbow.

It does not introduce any additional pressure loss other than that caused by the elbow. 

A differential pressure transmitter is used to measure pressure between the walls.

This type of flow meter technology can be configured as either a gas or a liquid flow meter.

A wedge-shaped element that is perpendicular to the flow at the top of the conduit which means that the bottom part is unrestricted.

Therefore, it is useful in slurry measurement.   

A differential pressure transmitter is used to measure pressure between either side of the wedge.

However, this type of differential pressure flow meter technology can be constructed to work as either a gas or a liquid flow meter.

Consists of a V-shaped cone element placed at the center of the pipe which creates an annular space for the passage of fluid.

It has a lower permanent pressure loss than orifice flowmeter.

The cone element conditions the flow at the same time it is creating the pressure differential, providing for smoother and less noisy differential pressure readings vs. the orifice technology.  

A differential pressure transmitter is used to measure pressure before and after the cone. 

This type of differential pressure flow meter can be constructed to measure gases, liquids, or steam.

This type of flow meter relates a change in flow rate to the differential pressure across a spring-loaded cone.

The cone repositions itself to balance the force.  

This, in turn, changes the aperture for the flow.

Flow rate has a relationship with the differential pressure of the flow meter and the position of the spring-loaded cone.

A differential pressure transmitter is used to indicate flow.

This type of differential pressure flow meter technology can be constructed to measure either gas or liquids.

Flow rate is linearly proportional to the differential pressure and inversely proportional to the viscosity of the flowing fluid.  

A flow can be made laminar by passing through a bundle of small diameter tubes.

A differential pressure transmitter is used to measure pressure before and after the tubes.

This type of differential pressure flow meter technology can be constructed to measure either gas or liquids.

Featured DP Flow Meters for Sale

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Sino-Inst is a manufacturer of Differential Pressure Flow Meters. We supply more than 20 types of Differential Pressure Flow Meters. 30% are orifice plate flow meters. 30% are Annubar type flowmeters, and 40% are other differential pressure flowmeters,

Differential pressure flowmeter is a new type of transmitter integrating differential pressure transmitter, pressure transmitter, temperature transmitter, and flow totalizer. It can display working pressure, temperature, instantaneous and cumulative flow. It can also perform automatic temperature and pressure compensation for gas and steam, and realize the function of directly displaying the standard flow rate and mass flow rate on site. In the case of an external 24V power supply, it can also provide current, frequency, and 485 personnel transmission. And it can work for 2-3 years with one battery, and can be directly matched with differential pressure flowmeters.

There are many types of differential pressure flowmeters, such as orifice flowmeters, uniform velocity tube flowmeters, and Venturi flowmeters are based on flow sensing in pipelines. They calculate the flow according to the differential pressure generated by the flow detection in the pipeline. They have the advantages of firm structure, stable performance and long service life.

Sino-Inst has provided pressure measurement solutions to customers for many years. Our Differential Pressure Flow Meters, made in China. Widely exported to the United States, Britain, Germany, South Africa, Norway and other countries.

If you need Differential Pressure Flow Meterss, but have technical questions, please feel free to contact our sales engineers.

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Magnetic Water Flow Meter

Magnetic Water Flow Meter is an electromagnetic flowmeter used to measure conductive fluids. Conductive liquids such as drinking water, sewage, wastewater, seawater, ammonia, cement slurry, etc.

Magnetic Water Flow Meter provide highly accurate flow measurement for a wide variety of conductive fluid applications. Magnetic Water Flow Meter is a volumetric flow meter that measures liquids or liquid slurries that have a minimum conductivity of 5 µS/cm. Based on Faraday’s law of electromagnetic induction. Magnetic Water Flow Meter is ideal for wastewater applications or any dirty liquid which is conductive or water based. It is widely used in water treatment, environmental protection sewage measurement and control, papermaking and other industrial and agricultural production processes for flow measurement and control.

Sino-Inst offers a variety of  Magnetic Flow Meters for flow measurement. If you have any questions, please contact our sales engineers.

Features of Magnetic Water Flow Meter

  • Not affected by changes in fluid density, viscosity, temperature, pressure and conductivity. The linear measurement principle can achieve high-precision measurement;
  • There are no flow blocking parts in the measuring pipe. The pressure loss is small, and the requirements for straight pipe sections are low;
  • Nominal diameter DN6-DN3000 covers a wide range. There are many choices of lining and electrodes. It can meet the requirements of measuring a variety of conductive fluids;
  • The converter adopts programmable frequency low frequency rectangular wave excitation. It improves the stability of flow measurement and has low power loss;
  • The converter adopts 16-bit embedded microprocessor. Full digital processing, fast calculation speed. Strong anti-interference ability, reliable measurement. High accuracy, flow measurement range up to 1500:1;
  • High-definition backlit LCD display. Easy to use, simple to operate, easy to learn and understand;
  • With RS485 or RS232 digital communication signal output;
  • With conductivity measurement function, it can judge whether the sensor is empty or not. With self-check and self-diagnosis function;
  • Adopt SMD devices and surface mount (SMT) technology. High circuit reliability;
  • Can be used in corresponding explosion-proof occasions.

Guess you like: What is Reynolds number?

Specifications of Magnetic Water Flow Meter

Measuring medium:Conductive liquids
Pressure(MPa)DN15-DN300, PN<1.6MPa; DN350-DN800, PN<1.0MPa;
above DN900, PN<0.6MPa;
Measuring tube materialCarbon steel,304 stainless steel
The sensor measures the head materialABS/Polypropylene
Electrode materialSUS316,hastelloy B,hastelloy C
Accuracyflow velocity≤0.5m/s,±1.5%,Full range velocity>1m/s,±1.0%
Medium temperature(ºC)ABS:+80ºC, Polypropylene:+80ºC
Environmental conditions-25ºC~+60ºC
relative humidity5%~95%,
Atmospheric pressure86~106kPa
Straight pipe section requirementsupstream 15D,downstream 10D
Ingress protectionIP65,Optional IP68
Connectionflange connection,threaded connection
Power supply mode:24V power supply or 220V power supply, 3.6V lithium battery power supply
Explosion-proof grade:intrinsically safe ExdⅡia CT2-T5 flameproof ExdⅡCT2-T5
Transmission distance:Two-wire 4-20mA standard current output: ≤1500m;
485 output and HART output: ≤1200m

Take a quick look: How electromagnetic flowmeters work ?

Magnetic Water Flow Meter Applications

KLD electromagnetic water flowmeter can be used to measure the volume flow of conductive fluid in a closed pipeline. It is widely applied in the flow measurement and control in the fields of chemical and petroleum industry, metallurgy industry, water and wastewater, agriculture and irrigation, paper making, food and beverage industry and pharmaceutical industry.

The premise of using Magnetic Water Flow Meter is that the measured liquid must be conductive. The conductivity of the liquid cannot be lower than the threshold, the lower limit. If the conductivity is lower than the threshold, it will cause measurement error until it can not be used.

It can be measured even if the value exceeds the threshold, and the indication error does not change much. The threshold value of general electromagnetic flowmeter is between 10-4~(5×10-6)S/cm, depending on the model. It also depends on the length of the flow signal line between the sensor and the converter and its distributed capacitance. The product manual usually stipulates the signal line length corresponding to the conductivity.

Read more about: Digital Water Flow Meters

Magnetic Water Flow Meter to Measure Waste Water

The sewage treatment process is mainly through biological oxidation, flocculation, precipitation and other processes to achieve the purpose of sewage purification. At each stage, a certain gauge is needed to measure.

In the sewage industry, according to the characteristics of the corrosiveness, abrasiveness, temperature and condensation of the tested substance and the price tolerance. Different lining and electrode materials should be selected.

In the sewage treatment process, it is necessary to configure corresponding detection instruments according to the process requirements to form a reliable control system.

Generally, sewage treatment plants are equipped with flow meters in the following process inspection procedures:

  1. Water inlet pipe.
  2. Detection of mud volume from primary settling tank to mud storage tank.
  3. Detection of surplus and sludge flow in the sludge pump room.
  4. Detection of the return sludge flow in the sludge pump room.
  5. Detection of the effluent flow of the secondary settling tank distribution well.
  6. Detection of the sludge intake of the digestion tank.
  7. Digestion tank Mud output detection. 8. Flocculation tank reagent input detection, etc.

More about: Sewage Flow Meter Selection

Magnetic Water Flow Meter to Measure Industrial Water

The conductivity of industrial water and its aqueous solution is greater than 10-4S/cm. The conductivity of acid, alkali and salt solution is between 10-4~10-1S/cm, so there is no problem in use. Low distilled water is 10-5S/cm and there is no problem.

The electromagnetic flowmeter cannot measure liquids with very low conductivity. Such as petroleum products and organic solvents. Cannot measure gas, steam and liquids containing more and larger bubbles.

It is found from the data that some pure liquids or aqueous solutions have low conductivity and are considered unusable. However, in actual work, we will encounter examples that can be used because of impurities. Such impurities are beneficial to increase conductivity.

For aqueous solutions, the conductivity in the data is measured in the laboratory with pure water ratio. The actual aqueous solution may be proportioned with industrial water. The conductivity will be higher than found, which is also conducive to flow measurement.

Extended reading: Industrial VS Residential inline water flow meters

Magnetic Flow Meter Price

Electromagnetic flowmeter selection table
KLD               SENSOR
15             DN15 0.19-3.18m³/h
            … Unit:mm
3000             DN3000 
Pressure rating 6           0.6Mpa
10           1.0Mpa
16           1.6Mpa
40           4.0Mpa
          Special requirements
160           16.0Mpa
Connection mode F         Flange
I         plug-in
C         Sanitary type-clamping connection
ST         Sanitary-thread connection
Lining material 1       Polytetrafluoroethylene(PTEE)
2       Polychloroprene
3       Polyurethane rubber
4       F46
5       Fluorosilicone gum
6       PFA
Electrode material Y     One body
F     Separate type
L     Separate type/immersion
Structure of flowmeter 1   SUS316L
2   Hastelloy b 2B
3   Hastelloy b 2C
4   Titanium
5   Tantalum
6   Platinum iridium alloy
7   Stainless steel coated tungsten carbide
Output signal P Volume flow4-20mA/pulse
B Volume flow4-20mA/RS232
M Volume flow4-20mA/RS485
H Volume flow HART protocal output

Extended Reading: LORA water meter

Main performance of lining material:

Lining materialMain performanceScope of application
Polytetrafluoroethylene (PTFE)1. A material with relatively stable chemical properties in plastics can withstand boiling hydrochloric acid, sulfuric acid and aqua regia, but also resistant to concentrated alkalis and various organic solvents, and is not resistant to chlorine trifluoride, high-flow liquid fluorine, liquid oxygen, and ozone. corrosion.
2. Poor wear resistance
Strong corrosive media
such as concentrated acid and alkali
PFACorrosion resistance is the same as PTFE, strong resistance to negative pressureCan be used in negative pressure state
F461. Corrosion resistance is the same as PTFE 2. Low abrasion resistance 3. Strong negative pressure resistance1. Same as PTFD
2. Can be used for low-wear media
Neoprene1. Excellent elasticity, high breaking force, good wear resistance
2. Resistant to the corrosion of a certain low concentration of acid, alkali, and salt media, and not resistant to the corrosion of oxidizing media
Water, sewage, ore slurry, weak abrasive mud
Polyurethane1. Excellent abrasion resistance (equivalent to 10 times of natural rubber)
2. Poor acid and alkali resistance
3. Cannot be used for water mixed with organic solvents
Neutral and strong abrasion slurry, coal slurry, mud, etc.

Corrosion resistance of electrode material:

Electrode materialCorrosion resistance
SUS316Used for industrial water, domestic water, and weak alkali corrosive media,
Widely used in petroleum, chemical, urea, vinylon and other industries
Stainless steel coated tungsten carbideFor non-corrosive, strong abrasive media
Hastelloy B (HB)It has good corrosion resistance to all concentrations of hydrochloric acid below the boiling point, and it is also resistant to sulfuric acid, phosphoric acid, hydrofluoric acid, organic acids, etc.
Corrosion of oxidizing acid, alkali, and non-oxidizing salt solution
Hastelloy C (HC)It is resistant to oxidizing acids, oxidizing salts or other oxidizing agents.
Titanium (Ti)It is resistant to corrosion by sea water, various chlorides and hypochlorites, oxidizing acids, organic acids, alkalis, etc., but not resistant to corrosion by purer reducing acids. But if the acid contains an oxidant, the corrosion is greatly reduced
Tantalum (ta)It has excellent corrosion resistance, which is very similar to glass, except for hydrofluoric acid, fuming sulfuric acid and alkali, it can withstand the corrosion of almost all chemical media.
Platinum-iridium alloyAlmost suitable for all chemical substances, but not suitable for aqua regia and ammonium salt.

Extended Reading: 3 inch (3″) Water Flow Meter

The price of electromagnetic flowmeter is determined by the selection of electromagnetic flowmeter. The Magnetic Water Flow Meter reference price is USD550.00-3000.

The key questions which need to be answered before selecting a magnetic flow meter are:

  • Is the fluid conductive or water based?
  • Is the fluid or slurry abrasive?
  • Do you require an integral display or remote display?
  • Do you require an analog output?
  • What are the minimum and maximum flow rate for the flow meter?
  • What are the minimum and maximum process pressure?
  • What are the minimum and maximum process temperature?
  • Is the fluid chemically compatible with the flow meter wetted parts?
  • What is the size of the pipe?
  • Is the pipe always full?

How much is a 2 inch water flow meter? Let’s find out.

If you have question about Magnetic flow meter,

Please contact us, our engineer will offer help.

Extended Reading: Guide: Magnetic Flowmeter Installation

Featured Water Flow Meters

Extended reading: Sludge flow meter for sewage treatment return activated sludge system

Sino-Inst offers over 50 magnetic water flow meter for flow measurement. About 50% of these are wastewater flow meters, 40% is the liquid flow sensor. And 20% are Ultrasonic Flow Transmitter and mass flow meter.

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

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

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