The gas mass flow meter is a true direct mass flow meter

Gas mass flowmeter is an instrument that uses the principle of thermal diffusion to measure gas flow. The sensor consists of two reference grade thermal resistors (RTDs). One is a speed sensor RH, and the other is a temperature sensor RMG that measures changes in gas temperature. When these two RTDs are placed in the measured gas, the sensor RH is heated, and the other sensor RMG is used to sense the measured gas temperature. As the gas flow rate increases, the airflow removes more heat and the temperature of the sensor RH decreases. Thermal gas mass flowmeters are divided into: insertion type and pipe section type according to the installation method. The early TMF directly put the heating coil and temperature measuring element into the fluid and directly contacted the fluid. It is a contact flow meter. Because it cannot solve the problems of mouth erosion, wear and explosion protection, its industrial application is greatly limited. . The Thomas flowmeter is a representative of this kind of flowmeter, which is mainly used to measure the mass flow of gas with a large flow rate; by the 1950s, a boundary layer flowmeter that was not in contact with the fluid was proposed, which overcomes the problem of contact flowmeters. However, the measurement results are easily affected by medium parameters (such as thermal conductivity, specific heat capacity, viscosity, etc.), and can be used to measure large liquid flow rates; in the 1970s, the thermal distribution type TMF based on measuring fluid temperature distribution, due to its The advantages of * have been developed rapidly at home and abroad. It is used to measure the small flow of gas. With the development of science and technology, after redesigning the structure of the flowmeter, on the basis of the contact flowmeter, people put forward a A immersion-type TMF has also been developed rapidly and can be used to measure the gas flow of larger pipe diameters. To sum up, TMF is a direct mass flow meter mainly used to measure gas mass flow. The gas mass flowmeter is designed and produced based on the principle of thermal diffusion. This product is widely used in steel mills, coking plants, petroleum, chemical, thermal, medical, thermal power plants, environmental protection and other industries. The gas mass flowmeter is a real direct mass flowmeter, and the user does not need to compensate the pressure and temperature. The instrument has no moving parts, small pressure loss, wide range ratio, high precision, high reliability, simple installation and convenient operation.

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