A thermal gas mass flowmeter is an instrument that measures gas flow based on the principle of thermal diffusion. The sensor consists of two reference stage thermal resistors (RTDS). One is the speed sensor RH, and the other is the temperature sensor RMG for measuring the change in gas temperature. When these two RTDS are placed in the gas to be measured, one sensor RH is heated, and the other sensor RMG is used to sense the temperature of the gas to be measured. As the gas flow rate increases, the gas flow takes away more heat, and the temperature of the sensor RH drops.
Thermal flowmeters are flow meters designed based on the principle of thermal diffusion. That is, when a fluid flows through a heated object, the amount of heat lost by the heated object is in a certain proportional relationship with the flow rate of the fluid. The sensors of this series of flowmeters have two standard-grade RTDS, one used as a heat source and the other for measuring fluid temperature. When the fluid flows, the temperature difference between the two is linearly related to the size of the flow rate. Through microelectronic control technology, this relationship is converted into a linear output of the flow measurement signal
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