Brief introduction to basic knowledge of thermal gas mass flowmeter

Introduction to basic knowledge of thermal gas mass flowmeter The thermal gas mass flowmeter has two sensors, one is a speed sensor and the other is a temperature sensor. When measuring, the sensor probe of the thermal gas mass flow meter is inserted into the fluid to feel the flow velocity and temperature of the fluid. They are at the same time the two bridge arms of the electronic component bridge, forming an unbalanced bridge. When energized, the thermal gas mass flowmeter bridge arm current heats the speed sensor to Tu which is a temperature difference △T higher than the temperature T, T-Tu=△T. An unbalanced bridge becomes a balanced bridge. At this time, the bridge outputs a voltage corresponding to zero flow, and after processing by the amplifying circuit, the lower limit signal of the output flowmeter is 4mA; the instantaneous flow display is 000; and the cumulative flow has no cumulative action, and the cumulative display keeps the original cumulative number unchanged . When the fluid flows through the heated speed sensor, according to the principle of heat conduction, it will take away part of the heat of the speed sensor, causing the temperature of the thermal gas mass flowmeter to drop, and the larger the flow rate, the more heat it takes away, and its temperature T1 drops Also bigger, the bridge becomes an unbalanced bridge again. Due to the feedback control effect of the bridge, it is always necessary to return to the balanced bridge state. For this reason, the bridge must flow a current proportional to the flow rate on the speed sensor, so that the speed sensor returns to the temperature Tu in the equilibrium state. At this time, the bridge will output a voltage signal proportional to the flow. After circuit amplification and linearization processing, the output is a current signal between 4~20mA which is proportional to the flow, and the instantaneous flow is displayed as a value up to the scale flow, and the accumulation action will be accumulated at a speed proportional to the instantaneous flow. As mentioned above, suppose the heating power of the speed sensor is P, the temperature difference between the speed sensor and the fluid is △T, T1-T2=△T. The mass flow rate of the fluid is Pv. According to L-V.King's theorem, the heat Q taken away by the fluid flowing through the heated thermal gas mass flowmeter speed sensor is equal to the electric power P that heats the speed sensor to temperature T. Due to the feedback control effect of the bridge, T1-T2=△T is a constant constant. Therefore, the output of the bridge (which determines the output of the flowmeter) has a single-valued function relationship with the mass flow rate Pv of the fluid. In particular, it should be pointed out that since the heat of the speed sensor is taken away by the molecules in the fluid, the speed sensor measures the mass flow rate Pv of the fluid. Therefore, the mass flow rate of the fluid can be obtained by multiplying it by the cross-sectional area s of the fluid pipeline. Thermal gas mass flowmeters have many advantages: solid structure, suitable for industrial applications such as gas areas; large measurement range; good accuracy and repeatability; fast response time; can measure gases containing medium solid particles.

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