The thermal gas flowmeter adopts the principle of heat diffusion

The thermal gas flowmeter adopts the principle of thermal diffusion, and thermal diffusion technology is a technology with excellent performance and high reliability under harsh conditions. Its typical sensing elements include two thermal resistances (platinum RTDs), one is a speed sensor and the other is a temperature sensor that automatically compensates for changes in gas temperature. When two RTDs are placed in a medium, where the speed sensor is heated to a constant temperature above ambient temperature, the other temperature sensor is used to sense the medium temperature. The gas mass flow through the velocity sensor is calculated from the amount of heat transfer through the sensing element. As the gas flow rate increases, the heat taken away by the medium increases. The temperature of the sensor is lowered accordingly. In order to keep the temperature constant, it is necessary to increase the operating current through the sensor, and the increased part of the current is proportional to the flow rate of the medium. Gas mass flowmeter installation direction: vertical installation, the best installation method is vertical installation and the fluid flows through the meter from bottom to top, so that the entrained solid particles can sink, the gas rises through the measuring tube, and the fluid in the measuring tube can be completely Drain so that it is not affected by solid scaling. For horizontal installation, the two measuring tubes of the mass flowmeter must be horizontal. The correct installation should make the transmitter housing vertically upward or downward, and avoid the transmitter housing and the pipe being on the same level.

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