The clogging of the flowmeter is also the cause of the measurement deviation of the flowmeter

In general, when ordering a flowmeter, it is necessary to provide the type of gas to be measured, the working pressure point and the temperature point, and the manufacturer will calibrate the flowmeter before leaving the factory to make it meet the measurement accuracy requirements in the required working environment. For most industrial applications, the gas type and gas working pressure can be well controlled, but the gas temperature often changes with the ambient temperature, causing measurement errors. Therefore, when the measured gas state changes, it is necessary to compensate for these changes. The operating ambient temperature is too high or too low. The normal operating ambient temperature of the general thermal distributed gas mass flowmeter is -10~70°C, and the operating ambient temperature is too high (>70°C, such as in the engine compartment) or too low (<-10 ℃, such as the northern cold region) will also affect the measurement accuracy of the thermal distributed gas mass flowmeter. Because the measurement principle of the thermal distributed gas mass flowmeter is based on the temperature change of the capillary measuring tube, and the heat generation of the heating winding on the capillary measuring tube is very small, the temperature distribution of the capillary tube will be affected if the external ambient temperature is too high or too low. Although flowmeter manufacturers have taken certain insulation measures for the capillary measuring tube in the design to reduce the convective heat transfer and radiation heat transfer between the capillary measuring tube and the external environment, but when the external ambient temperature is too high or too low, The heat conduction from the flowmeter housing will also affect the temperature distribution on the capillary measuring tube, thereby affecting the accuracy of the oxygen flowmeter. The blockage of the flowmeter is also the cause of the measurement deviation of the flowmeter. When the laminar flow resistance part is blocked by impurities, the flow resistance in the main channel increases, the actual flow rate decreases, and the measured value is larger than the actual value; when the capillary measuring tube is blocked by impurities, the flow rate in the capillary measuring tube decreases, resulting in the measured value being higher than the actual value. The value is small. At present, when the thermal distributed gas mass flowmeter is in use, a filter is installed upstream to prevent impurities from clogging the flowmeter, so such failures rarely occur. However, it is necessary to pay attention to the dust protection of the flowmeter during the regular calibration and return, and the need to clean the filter upstream of the flowmeter regularly. In addition to the above failure reasons, the thermal distributed gas mass flowmeter also has circuit board damage during use, resulting in no signal output, sensor failure leading to zero point deviation, and aging of electronic components (especially the aging of the heating winding, resulting in winding The heating power and resistance change) lead to the decrease of the measurement accuracy of the flowmeter and other failure reasons. These failures have a low probability of occurrence, so choose to return to the factory for repair after a failure occurs.

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