Gas mass flow controller

The gas mass flow controller is based on the principle of thermal mass flow measurement. With control valve. The Micro Gas Flow Controller (MFC) is used to precisely measure and control the mass flow of gas.

Features of Gas mass flow controller

  • The standard minimum flow rate of the micro gas mass flowmeter is 2ml/min. Chlorine, air, and compressed air can reach it. Some gases with a low C.F coefficient can be measured even lower
  • The standard accuracy of the gas mass flowmeter is 0.5%. 1.0% reading, 0.5% full scale accuracy, repeatability 0.2%. The accuracy of the controller is 1.0% (full scale)
  • The flowmeter’s turndown ratio is 1:100
  • The valve control range of the controller is 1:50
  • The minimum can measure 2sccm, the maximum can reach 3000slm
  • The base material of the flowmeter and controller is SS316L. The material in contact with the gas is also SS316L. It can measure some weakly corrosive gases.
  • The leak rate of the flow meter and controller is 1×10-SCCSHe.
  • Sealing material is chloro rubber, oxyprene butadiene rubber

Specifications of Gas mass flow controller

MediumSuitable for gas, weakly corrosive gas. For example: nitrogen, air, not suitable for ammonia
Response time<2.0S
communicationRS232/485, MODBUS
Output0~5V, 1~5V, 4-20mA
powered by+/-15VDC,24VDC
Work pressurePressure difference: 0.1~0.5Mpa
Maximum withstand voltage3Mpa/10Mpa
Electrical InterfaceDB15 hole
Leak rate1×10·SCCSHe
Temperature Coefficient+/-0.025%F.S/℃C
Base materialSS316L
Seal materialFluorine rubber, neoprene rubber, nitrile rubber

Extended reading: Cryogenic Liquid Nitrogen Flowmeters

Gas mass flow controller working principle

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

The flow signal measured by the sensor heating bridge is sent to the amplifier for amplification. The amplified flow measurement voltage is compared with the set voltage.

Then amplify the difference signal to control the regulating valve. Through closed-loop control to control the flow-through, and make it equal to the set flow. The flow divider determines the flow of the main channel.

The picture shows the working principle diagram of the MFC and the flow indicator connected:

Gas mass flow controller working principle

The detected voltage of the flow rate output by the controller is directly proportional to the quality of the gas flowing through the channel. The full-scale detection output voltage is 5VDC. The detection range of the gas mass flow controller is 2~100% full scale (the turndown ratio is 50:1) The flow resolution is 0.1% of full scale.

Note: When the “valve control” line of the gas mass flow controller is set to the “cleaning” position, it can also be used as a gas mass flow meter. At this time, the output value of the flow detection output voltage may reach more than 10VDC.

It should be noted that once the output voltage exceeds 5VDC, the flow detection voltage and the actual flow rate are not linearly corresponding.

When cleaning, the flow rate display is inaccurate. Moreover, the flow rate may increase and the display decrease. But these will not damage the mass flow controller.

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Liquid mass flow controller for process liquid -Sino-Inst

The liquid mass flow controller can quickly and accurately measure the volume flow/mass flow of the process liquid quickly and accurately.

  • Product SKU: Liquid mass flow controller
  • Product Brand: Sino-Inst
  • Product Currency: USD
  • Product Price: 900
  • Price Valid Until 2099-09-09
  • Product In-Stock: PreOrder

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Common types of flow controller MFC

  1. Positive displacement flow meter, also known as fixed displacement flow meter.

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

  1. Float type flowmeter, also known as rotameter.

It is a kind of variable area flowmeter. In a vertical tapered tube that expands from bottom to top. The gravity of a float with a circular cross-section is borne by the hydrodynamic force. So that the float can rise and fall freely in the cone tube.

Read more about: Rotameter flow meter-Variable Area Flow Meters. Suitable for liquid and gas volumetric flow measurement and control.

  1. Differential pressure type flowmeter.

It is based on the differential pressure generated by the flow detector installed in the pipeline. Known fluid conditions and the size of the test room and pipeline to calculate the flow of the meter.

  1. Vortex flowmeter.

A non-streamline vortex generator is placed in the fluid.
The fluid is alternately separated on both sides of the generator to release two series of regularly staggered vortex meters.

  1. Turbine flowmeter.

It is the main type of velocity flow meters. It uses a multi-blade rotor (turbine) to sense the average flow velocity of the fluid. In order to derive the flow or total meter.

  1. Ultrasonic flow meter.

A meter that measures the flow rate by detecting the effect of fluid flow on the ultrasonic beam (or ultrasonic pulse).

  1. Electromagnetic flowmeter.

Electromagnetic flowmeter is an instrument for measuring conductive liquid made according to Faraday’s law of electromagnetic induction. Electromagnetic flowmeter has a series of excellent characteristics. It can solve the problems that other flowmeters are not easy to apply, such as the measurement of dirty flow and corrosive flow.

  1. Thermal flow meter.

The thermal flow meter sensor contains two sensing elements. A speed sensor and a temperature sensor.

They automatically compensate and correct for gas temperature changes.

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

When the temperature difference is kept constant, the energy consumed by electric heating can also be said to be the heat dissipation value. It is proportional to the mass flow rate of the gas flowing through it. It is suitable for the measurement of single gas and fixed ratio multi-component gas.

  1. Coriolis flowmeter.

The principle is to use the Coriolis force generated when the fluid flows in the vibrating tube. The force is measured directly or indirectly to obtain the fluid mass flow rate.

Extended reading: Flow Totalizer F3000X for Data collection and calculation

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Sino-Inst offer over 50 Mass Flow Meters and controller with Best Price.

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

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

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Gas mass flow controller for micro gas flow measure &control

The gas mass flow controller is based on the principle of thermal mass flow measurement. With control valve. The Micro Gas Flow Controller (MFC) is used to precisely measure and control the mass flow of gas.

Product SKU: Gas mass flow controller

Product Brand: Sino-Inst

Product Currency: USD

Product Price: 900

Price Valid Until: 2099-09-09

Product In-Stock: PreOrder

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