Flow Meter

We are China industrial flow meters supplier. As we all know flow meter is a kind of device to measure the amount of medium pass through the flow sensor, according to the medium, we can classify we supplied flow meters into digital liquid flow meter, gas flow meter and steam flow meters.

Flow sensors (flow transducer) and flow transmitters are the primary devices of the flow meters. Flow transducer senses the medium pass through the flow meter sensor and flow transmitter generates a kind of stable flow signal from the raw flow transducer signals. Some customers need analog flow meter which produces 4-20mA signals, or pulse flow meter, China flow meter manufacturers can meet the customers’ technical specifications, and most of the flow instruments we supplied is totalizing flow meter (cumulative flow meter) which can not only display instant flow but also totalized flow. We have different size flow meters ,such as 1 inch flowmeter, 2 inch flow meter,3 inch flow meter, 4 inch flow meter, 6 inch flow meter, 8 inch flow meter,we can make max DN2000 magnetic flow meters.

We are especially good at selection of flow meter types. One specific flowmeter cannot meet all the applications; custom flow meters are manufactured according to different industrial applications. We generally sort flow meters as below based on the technique of measurements.

volume flow metre types

Mass Flow meters
If you want to buy China factory flow meter, and need different kinds technical specifications, such as ,hot water meter, hygienic flow meter, cheap air and gas flow meter sensor, we can all meet your demands, and welcome to send inquiry to us, we will choose proper type meters for your specific applications. Each flow meter is unique on for you, China flow meter is not only good price, but also great service and amazing delivery time.

What is flow meter?

A flow meter, also known as a flow sensor is a mechanical device that measures the flow of liquids and gases. This flow rate can be volumetric, mass, linear or nonlinear. Different flow meters monitor the flow of gases and liquids contained in pipes and cylinders and give the value of flow rate digitally. Many types of such flow meters are present that vary in their working principle, accuracy, applications, and limitations. Flowmeter is also called flow transmitter, flow sensor and flow indicator in different industries. Some inline flow meters are designed to measure fluid flow in closed pipes and cylindrical containers whereas some flow sensors can also measure water flow in streams, open channels, canals, and rivers. Such flow sensors use radiation to operate. Flow meters bring about the quantification of fluid movement. The units of measurement used by these meters are either volumetric or mass flow rates, for example , water flow meter gpm is with volumetirc units, Thus a flow is measured in liters per second or kg per second. Both liquids and gases are applicable to these measurements. There is also mechanical flow meter or digital flow meter available.

Cumulative flow meter

We sell low cost cumulative flow meter with both digital and mechanical counter. These flow meter can show fluids cumulative passing the flow meter sensor. For example , our gas turbine flow meter, magnetic flow meter , thermal mass flow meter are all cumulative flow meter.

How to choose the right flow meter?

Different flow meters are for different applications, they are selected according to the fluids characters, operation condition and user’s budget These characteristics include accuracy, measuring ranges, bearable temperature and pressure ranges, and other features. The choice however largely depends upon the application required. Different industries use flow meters of different types. Moreover, some other features are also necessary to be kept in mind while selecting a economical and proper flow meter. This secondary set of requirements includes user requirements, risk factors, knowledge of calibration and maintenance, availability of spare parts and cost of the liquid flow sensors or gas flow sensors. Therefore there are many aspects to be taken care of while selecting a flow meter of the best choice. A list of the basic and most necessary things to consider is presented as follows.

choose the right flow meter

1- The first step is to make a list of the requirements.

The flowmeter information in different flow sensors can be gas or liquid flow rate and total flow. Also the mode of transmission is different in various flowmeters. Some meters have digital mode (which we called digital flow meter) whereas others have analog mode of transmission. Moreover, the data frequency can be very low to very high. All these factors are the basic requirements before selecting a flow meter therefore they must be kept in mind. For example, customers often request digital oil flow meter, digital gas flow meters, digital air flow meter or digital water flow meters, whiles some request mechanical oil flow meter.

2- Fluid and flow characters

The type of fluid and its flow to be measured is an important influencing factor. Fluids applicable to flow meters include liquids and gases or air. Based on their density and other features, these fluids can be subcategorized. For example liquids may include tap water, wastewater, oils, honey and others. The different types of flow meters are not applicable to all liquids. Some have high accuracy flow meter for clean water and gases whereas others are more effective for low cost wastewater flow meter and cheap acid flow meter or in-expensive chemical flowmeter . Similarly the flow rate and characters of fluids can be steady and turbulent. This feature also has special flow meter applications.  According to the fluids characters, low flow flow meter, high viscosity flow meter ,acid flow meter often needed by customers.

3- The third step of requirements is to access the functional characters of flow meters.

This includes their accuracy, limitations, pressure and temperature ranges and piping and fitting characters. If a non-commercial measurement is required a low-cost flow meter with average accuracy can be selected but if commercial use is needed, high accuracy flow meters and measurable ranges must be preferred, it is custody transfer flow meter.

Flow meter Types offered by China flow meter factory and manufactures

Based on their accuracy, principle of working and their applications, the flow meter are subdivided different types. A brief overview of these types is given below

Magnetic flow meter

A magnetic or electromagnetic flowmeter measures conductive fluid flow involving the induction of a magnetic field. It quantifies the flow of fluid and is best for acid, corrosive, slurry or rough liquids.

How it work ?

A mag meter contains a metering tube through which a magnetic field is applied to the flowing fluid. A potential difference is created that causes a change in velocity of fluid and therefore flux is altered. The change of flux creates a voltage which is sensed by the magnetic flow meter sensor and calculated in form of fluid flow rate.


Magnetic flow transmitters are highly applicable for industries concerned with wastewater management or municipal section, use as digital waste water flow meter or irrigation flow meter. Full bore electromagnetic flow meters are also used as electronic tap water flow meter and sewage management plants.Some chemical factories also buy magnetic inductive flow sensor to measure chemical solution, acid, alkali, paste, mud  and other corrosive  solution.These magnetic type flow meters have an advantage of bulk flow measurement that makes its wide range of applications. By choosing different liners and electrodes material, magnetic inductive flow sensor can handle a lot tough applications, such as corrosive liquid flow meter, acid flow meter, HCL flow meter, slurry flow meter, brine flow meter.etc.

Turbine flow meter

A turbine flow meter is a device for the measurement of the volume of fluid. These meters have an accuracy of 0.5% and are used mostly in clean liquid or gas. There are 2 types turbine flow meters, liquid turbine flow meters and gas turbine flow meters. Liquid turbine flow sensor is intended to measure clean and low viscosity fluids, such as water, fuel, palm oil, edible oil, RO water, tap water, diesel, gasoline, alcohol.milk.,etc. gas turbine flow meter is used to measure air, nitrogen, oxygen, hydrogen, biogas, natural gas , helium (He) gas.etc

Working of turbine flow meter

The turbine type flow sensor consists of a rotor with multiple blades placed at right angle to each other. As fluid passes through the flow sensor, it puts a pressure on the blades of the rotor. The rotor starts to rotate under the fluid pressure and this rotation is directly proportional to fluid velocity. A turbine flow sensor mounted externally to the rotor measures the velocity of rotation and generates the reading stating the volume of fluid. Turbine flow transmitters with digital indicator to show fluids total flow and flow rate, also transmitter 4-20mA or pulse output. Electronic turbine flow meter can be also with HART protocol or MODBUS.

Applications of turbine meter

Due to high accuracy and lower risks, turbine type flow meter has a wide range of commercial applications. Turbine meters are used in oil and gas industries, aerospace technologies, pharma and biotech plants, food processing plants and other industries related to cryogenics. This vast application is due to its bulk volume measurements; better repeatability and wide bearable range of temperature. According to the different applications, low flow turbine flow meters, sanitary turbine flow meters, air turbine flow meters, natural gas turbine flow metre, LWGY turbine flow meter are often purchased.

Oval gear flow meter

Oval gear flow meters are used for precise and accurate measurement of fluid volumes. Gear type flow meters are positive displacement type flow meters (PD flow meter) that give precise volume readings of passing liquid. This oval meter remains stable function even in harsh environments; it is heavy duty gear type flow sensor.

How Oval gear flow meter  is working ?

The oval gear flow sensor consists of an oval-shaped wheel with 2 tooth on its side. As the fluid passes through the device, oval meter causes the rotation of the wheel. The frequency of this rotation is directly proportional to the volume of fluid which is sensed and generated by the gear flow sensor.


These oval gear flow meters maintain high accuracy even in conditions of high viscosity and pressure. This stability of accurate readings is applied in different industries including food industry, shipping building & marine Industry, oil and gas industry, paper and pulp industry and other paint and petroleum industries. There are mechanical oval gear flow meter and oval gear digital meters. It is suitable flow measurement instrument  for viscous liquid ,such as heavy oil, asphalt, gear oil .,etc. it is also perfect inline oil flow meters ,such as diesel, fuel, gasoline.,etc. We also offer micro and microfluidic Oval Gear Flow Meter for customers .Silver Automation Instruments sell low price and rugged oval gear flow meter from China flow meter workshop.

Coriolis flow meter

A Coriolis flowmeter measures mass flow rates making use of motion mechanics. It is a type of mass flow meter that measures fluid flow in units of kilogram per second or tone/hour. Coriolis meter is unique from other meters because it also measures temperature, density, viscosity and mass flow.

Working principle of coriolis mass flow meter

Coriolis meter consists of a tube which twists due to fluid flow. An inertia is created due to this twisting and a pair of sensors then sense phase difference which is created due to oscillations in measuring tube. This phase difference is directly proportional to mass flow which is calculated by the sensor itself. Mass flow transmitter has electronic flow rate, total flow, temperature and density information, it can even have digital outputs for various controls.


The high measuring accuracy of 0.2% ~.0.1% makes it a widely applicable mass flow meter sensor. Its commercial use involves the oil and gas industry, food processing units, chemicals, and petrochemical industries and other life sciences industries. This Coriolis meter is also used for a variety of fluids. These fluids include crude oil, fuels, alcohol, refrigerant, vinegar, liquefied gases and cleaning agents. It is a perfect high viscosity flow meter for grease, chocolate, bitumen, resin.,etc

Vortex flowmeter

A vortex flow meter is a versatile device for measuring fluid flow in closed pickings. It's a broad spectrum vortex flow sensor that is specifically useful for conditions where mobile parts can pose a problem. They are applied to closed conduits where they meter the fluids flow and find the flow rate.

How vortex shedding flow meter works?

This  vortex shedding flow meter consists of a specialized sensor that can sense pressure changes. As the moving fluid flows through the bluff body of the sensor, a vortex bluff is created. This creates a continuous pulse of pressure on the side of the generator. This pulse is related directly to the flow rate .


The operating system of vortex flowmeters is simple and easy. Also the maintenance is easily maintained. This meter has broad spectrum of applications. It is used in heavy industries, power and energy production plants especially steam processes (vapor flow meter).It can be used as compressed air flow , condensate water flow meter, high temperature flow meter.

Metal tube variable area flowmeter

This variable area rotameter measures flow rate of liquids and gases using float principle. variable area meter is a volumetric flow meter with great accuracy and ease of management.

Working principle of metal tube rotameter

This metal tube variable area flow meter comprises a metallic tube with tapered ends. A float of magnetic nature is inserted in this tube where it can easily float. Fluid flows from the lower part of the meter to the upper part. As the fluid movement occurs, a differential pressure is created which monitors the movement of the float. When this movement of fluid stops, the float returns to its original point. This directory movement of the float is proportional to the flow rate that is sensed and calculated by the built-in variable area type flow meter sensor.

Applications of Variable area flow indicator

This area flow meter is versatile for many types of fluids. Oil, gas, saline and produced water,fuels, crude solvents and other fluids are measured with great accuracy and precision.It is a kind of low cost flow sensor, it is a solution for mini flow rate measurement. It can be local indicator flow meter without any power supply or can be rotameter with transmitters and 4-20mA output.

Differential pressure flow meter

This flow meter makes use of Bernoulli's equation to measure fluid movements in a pipe or a container. They can be used a liquid and gas measuring meters that are about 21% of market flow meters. They possess high accuracy and very lower risks of inaccurate measurements. V-cone flow meter, Orifice plate flow meter, balance flow meter,venturi flow meter,wedge flow meter are common typs DP flow meters.

How DP flow meter works?

This meter is applied to closed pipes where it imposes a partial obstruction to flowing fluid. Due to this obstruction a pressure difference known as "differential pressure" is created on upper and lower sides of the meter. The sensor measures this pressure difference to calculate the fluid flow rate. Bernoulli's equation is used to calculate the relation between differential pressure and fluid flow rate.


Differential pressure meter are simple, cheap and high-performance meters with high range of industrial applications. They are used in wastewater management plants, tap water and saline water industries, food industry, pharmaceutical industry, and various chemical and petrochemical industries. We encounter lot differential pressure flow meters applications, such as steam flow meter, coke oven Gas, flare gas flow meters

Differential Pressure Flowmeter-chino

Ultrasonic flowmeters

Ultrasonic flow meter use radar principle to calculate volume flow of liquids and gases. The sensor generates sound waves towards the flowing water source which are reflected back towards the transmitter which measures the velocity.

How it works ?

These meters make use of Doppler’s effect to calculate flow rates.  It consists of a sensor that produces ultrasonic sound waves to the flowing medium.The frequency of waves returning after striking the fluid are varied following the Doppler’s phenomena. A transmitter substance which is the part of the meter measures this returning frequency to calculate the velocity and thus the flow rate of the fluid.


Ultrasonic meter uses a unique working method than the other flow meters. This working way allows the meter to measure the flow rates of clean water from canals, streams, and rivers. It can also measure the rate of flow of saline water of seas and oceans. It is also employed in different industries to measure flow rates of gases and liquids.

Thermal Mass Flow Meters

Here we address both the general workings and specific features of thermal mass flow meters. Thermal dispersion flow meters, like all gas mass flow meters measure the mass flow of passing gases or air through an interchange of heat and energy. Hailed as a wildly accurate way to measure mass, thermal flow sensors find themselves employed across a breadth of industries in various applications. Let’s get into the details and discuss exactly how these fascinating devices function. Thermal mass flow meters have large applications ,such as used as air flow meter, N2 flow meter, flare meter,biogas flow meter, LPG flow meter, hydrogen flow meter,Co2 flow meter, natural gas flow meter, nitrogen flow meters.

How thermal mass flow meter work

In order to understand how thermal mass flow meters accurately measure the mass of gases and air, we first need to grasp a concept known as convective heat transfer. Often simply referred to as convection, convective heat transfer is the transfer of heat from one source to another through gases or fluids. In this case, thermal mass flow meters are placed in tubes or pipes with two sensors on either side. One thermal sensor functions as the gas flow sensor while the other works as a simple reference sensor, dependent on its partner. Each sensor is connected to a power supply that at times increases or decreases power to one side after another.

how thermal mass flow meter work

As gases and fluids are pumped through the pipe or tube, the electrical imbalance between the sensors creates, in turn, a heat imbalance. Through convective heat transfer the gas or fluid within the pipes conveys heat between each sensor. Immediately the sensors receive more or less power from the electrical supply to restore the heat levels to their baseline and to return balance to the circuit. The amount of electrical power used to restore said circuit is measurable, and by collecting that data scientists and technicians are able to deduce the mass of the passing gas or fluid with remarkable accuracy. This is how mass flow measurement occurs.

Thermal mass flow meter features

Now that we have gained a fundamental understanding of the way in which thermal gas mass flow meters function, let’s take a look at what features set these devices apart from the many other types of high temperature mass flow meters. The number one feature of a thermal mass flow meter is seemingly a lack of a feature; no moving parts. the lack of moving parts in gas flow sensor greatly reduces the frequency and need for maintenance. This, in turn, cuts costs and allows for investment in other areas of an operation. In addition to this, thermal mass flow meters are praised for their incredible cost-effectiveness, accuracy, and their ability to be deployed in even the largest of pipes and tubes. We develop inline thermal mass flow meter and insertion thermal flow meters for user’s applications.Thermal gas flow meters can measure gas, air or compressed air flow at standard condition without extermal temperature sensor or pressure sensor compensation.

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