Do you know why the measurement data of the gas mass flowmeter is unstable

Gas mass flowmeter is mainly used to measure gas, but it will be subjected to some factors in the application process, so that the measurement data is not stable, that is, the accuracy is not high. Let's introduce it below.

First of all, the thermal properties of gas will be changed with the change of pressure and temperature. As the temperature of gas changes, its density and gas composition 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, the volume of V gas, and we can see that when the density changes, the mass changes.

Secondly, the gas contains impurities, or water vapor.

When the impurities inside the gas master Hou, impurities will make the gas mass flowmeter probe will stick to the probe, so that the sensor sensitivity is reduced. If there is water gas, condensation will be formed, there is condensation on the sensor, the sensor surface is covered by condensation water icing, the real temperature and humidity induction for the external environment is cut off. Because the sensor itself can not detect the temperature change data, so that the measurement data is unstable.

The solution to the above problems is to compensate the temperature and pressure of the gas mass flowmeter, to solve the instability of the temperature and pressure changes on the data measurement, the formation of condensation in the gas can be isolated from the sensor with a diaphragm, the sensor to do coating to solve the problem.