The main classification of gas mass flowmeter

Gas mass flowmeters can be divided into two categories: one is the direct type, which directly outputs the mass flow rate; the other is the indirect type or derivation type, such as the combination of an ultrasonic flowmeter and a density meter, and multiplication of their outputs to get the mass flow rate. Direct type There are many types of direct type mass flow meters, such as calorimetric type, angular momentum type, gyro type, and double impeller type. This kind of instrument is suitable for measuring small flow gas. The disadvantage is that it is inert. The measured value is related to the constant pressure specific heat of the gas. The measuring element is in contact with the medium and is easily stained and corroded. It is a double-orifice differential pressure mass flow meter. Install two identical orifice plates at pipes A and B. Two identical constant-flow pumps that produce a constant volumetric flow q in opposite directions are installed in the splitter pipeline. Indirect Indirect mass flowmeter has 3 main types: combination of velocity flowmeter and density meter, combination of throttling (or target) flowmeter and volumetric flowmeter, throttling (or target) flowmeter Meter and Density Meter Combination. The basic principle of the thermal thermal mass flowmeter is to use an external heat source to heat the measured fluid in the pipeline. The heat energy flows with the fluid, and the mass flow rate of the fluid is reflected by measuring the heat (temperature) change caused by the fluid flow. The differential pressure differential pressure mass flowmeter is a flowmeter based on the Magnus effect. In practical applications, the combination of an orifice plate and a quantitative pump is used to achieve mass flow measurement. There are two common structures of double-orifice plate and four-orifice plate combined with quantitative pump. Coriolis Coriolis mass flowmeter (referred to as Coriolis force flowmeter) is a kind of direct measurement of mass flow using the principle of Coriolis force proportional to the mass flow generated by the fluid flowing in the vibrating tube. meter.

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