What are the types of mass flow controllers?

The mass flow controller (MassFlowController abbreviated as MFC) is used to precisely measure and control the mass flow of gas or liquid. Widely used in vacuum coating, optical fiber melting, micro-reaction device, mixed gas distribution system, capillary measurement gas chromatograph, optical fiber manufacturing and other equipment. And petrochemical, metallurgy, pharmaceutical and other industries. Mass flow controllers are generally divided into the following types: 1. Positive displacement flowmeter——Also known as fixed displacement flowmeter. It uses a mechanical measuring element to continuously divide the fluid into a single known volume part, and measures the fluid volume flow rate according to the number of times the measuring chamber is filled and discharged with the volume part of the fluid. 2. Rotameter——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 the float with a circular cross section is borne by the liquid power, so that the float can flow in the tapered tube. free ascent and descent. 3. Differential pressure flowmeter——It is an instrument that calculates the flow rate based on the differential pressure generated by the flow detection device installed in the pipeline, the known fluid conditions and the size of the detection room and pipeline. 4. Vortex flowmeter——A bluff vortex generator is placed in the fluid, and the fluid separates alternately on both sides of the generator to release two strings of regularly staggered vortex instruments. 5. Turbine flowmeter——It is the main type of velocity flowmeter, which uses a multi-blade rotor (turbine) to sense the average flow velocity of the fluid, thereby deriving the flow or total amount of the instrument. 6. Ultrasonic flowmeter——An instrument that measures flow by detecting the effect of fluid flow on an ultrasound beam (or pulse of ultrasound). 7. Electromagnetic flowmeter——Electromagnetic flowmeter is an instrument for measuring conductive liquids made according to Faraday's law of electromagnetic induction. The electromagnetic flowmeter has a series of excellent features, which can solve the problems that other flowmeters are not easy to apply, such as the measurement of dirty flow and corrosion flow. 8. Thermal flowmeter——Thermal flowmeter sensors contain two sensing elements, a flow sensor and a temperature sensor. They automatically compensate and correct for gas temperature variations. The electric heating part of the instrument heats the speed sensor to a certain value higher than the operating temperature, so that a constant temperature difference is formed between the speed sensor and the sensor measuring the operating temperature. When the temperature difference is kept constant, the energy consumed by electric heating, or the heat dissipation value, 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.

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