How to solve the inaccurate measurement of thermal gas mass flowmeter

How to solve the inaccurate measurement of thermal gas mass flowmeter The thermal gas mass flowmeter mainly measures gas, but it will be affected by some factors in the application process, and the measurement data is unstable, that is, the accuracy is not high. Below we introduce. First, the thermal properties of the gas will change with changes in pressure and temperature. As the temperature of the gas changes, its density and gas composition will also change. For example, air is more affected by temperature, while CO2 is more affected by pressure. . Due to its temperature and pressure and density changes. The thermal gas mass flowmeter measures the gas mass flowmeter. According to the mass conversion formula m=dV; the mass of m gas, the density of d gas, and the volume of V gas, we can see that the density changes and the quality changes again. . Second, the gas contains impurities, or water vapor. When there are too many impurities in the gas, the impurities will cause the probe of the thermal gas mass flow meter to stick to the probe, reducing the sensitivity of the sensor. If there is water vapor, it will form condensation, there is condensation on the sensor, and if the surface of the sensor is covered by condensed water, the real temperature and humidity sensing of the external environment will be cut off. Because the temperature change data cannot be detected by the sensor itself, the measurement data is unstable. The solution to the above problems is to make temperature and pressure compensation to the thermal gas mass flowmeter, to solve the instability of data measurement caused by temperature and pressure changes, to form condensation in the gas, to isolate the sensor with a diaphragm, and to coat the sensor to solve the problem. First of all, we can determine the scope of use of the thermal gas mass flowmeter according to the working principle. It is designed based on the principle of thermal diffusion. The relationship between the flow rate of the fluid is carried out, so from this point we can clearly judge that it can be used to measure compressed air, that is, as a measuring instrument. It can also measure the indicators of various gases in the air. The common ones are oxygen and nitrogen. for the measurement of gases. Another thing we should pay attention to is that its installation is very simple and fast, which saves a lot of time. Then it is also divided into plug-in type and pipe-section type, which makes its use range more extensive, and can be used for the measurement of automobile exhaust, as well as related measurement of blast furnace gas, measurement of underground ventilation flow, etc. . The above is the method to correctly understand the principle and field of application of thermal gas mass flowmeter. I hope it can be helpful to everyone.

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