Sensor Structure Analysis of Thermal Gas Mass Flowmeter

Sensor structure analysis of thermal gas mass flowmeter Thermal gas mass flowmeter is an instrument that uses the principle of heat conduction to measure flow. The instrument uses the constant temperature difference method to accurately measure the gas mass flow. It has the advantages of small size, high degree of digitization, convenient installation and accurate measurement. The sensor section consists of two reference grade platinum resistance temperature sensors. Using a bridge loop, one sensor measures the flow temperature and the other maintains a constant temperature difference above the fluid temperature, enabling flow measurement at high temperature and pressure. The thermal gas mass flowmeter has the following technical advantages: 1. Digital design. Overall digital circuit measurement, accurate measurement and convenient maintenance. 2. Using RS-485 communication or HART communication can realize factory automation and integration. 3. Easy installation and maintenance. When site conditions permit, non-stop production installation and maintenance can be realized. 4. The real mass flow meter does not need temperature and pressure compensation for gas flow measurement, and the measurement is convenient and accurate. The mass flow rate or standard volume flow rate of the gas can be obtained. 5. With wide range ratio, it can measure gas with a flow rate as high as 100Nm/s and as low as 0.5Nm/s, which can be used for gas leak detection. 6. Good shock resistance and long service life. The sensor has no moving parts and pressure sensing parts, and is not affected by vibration on measurement accuracy. The sensor part of the thermal gas mass flowmeter is composed of two precision platinum thermal resistances. The resistor is packaged in a stainless steel tube, which is not in direct contact with the fluid medium, but has good heat transfer performance. One of the shorter ones is the medium temperature sensing element; the other one is the heating element. As the gas flows through the heating element, heat is carried away. The heat removed is proportional to the velocity of the fluid and the density of the fluid. The thermal gas mass flowmeter consists of two temperature sensors. A certain amount of heating power P is applied to one of the sensors. Raise its temperature to the measured value T2. Another sensor measures the gas temperature T1. The mass flow rate of the gas can be determined according to the temperature difference (ΔT2T1) between the heater sensor and the gas and the heating power P.

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