How to debug the thermal gas mass flowmeter before leaving the factory

How to debug the thermal gas mass flowmeter before leaving the factory? The specific debugging content of the thermal gas mass flowmeter: the thermal gas mass flowmeter can measure various single components or a certain mixture of components such as air, nitrogen, carbon dioxide, and methane. Gas, when the flowmeter leaves the factory, nitrogen or air is generally used as the medium for verification. If the actual measurement medium is different from the calibration medium, flow conversion is required. For flow conversion processing, there are two situations to be treated separately. 1. Before the thermal gas mass flowmeter leaves the factory, the manufacturer converts the actual gas flow rate into the corresponding flow rate of nitrogen or air according to the gas composition actually used by the user, and then uses nitrogen or air as the verification medium for calibration. The thermal gas mass flowmeter calibrated in this way, when the user is using it, what is directly displayed and output is the flow rate of the gas actually used, without further conversion. 2. The above-mentioned flow conversion is not performed when the thermal gas mass flowmeter is calibrated with nitrogen or air before leaving the factory. The flowmeter calibrated in this way is suitable for nitrogen or air medium. When the flowmeter is used to measure another actual gas , it is necessary to perform flow conversion. That is, the actual gas flow is obtained by multiplying the indicated flow of the flowmeter by the sensor conversion coefficient of the actual medium. Different gases have different sensor conversion coefficients due to different specific heat capacities at constant pressure, so attention should be paid to the conversion during debugging. During the commissioning of the thermal gas mass flowmeter before leaving the factory, zero point adjustment, span adjustment and response time adjustment should be carried out. The zero point adjustment should be performed after the thermal gas mass flowmeter is properly connected to the pipeline, configured according to the measurement requirements, preheated for 20 minutes, and the temperature is stable. Adjust the zero point potentiometer to make it display zero at zero flow, or make the output signal meet the technical requirements at zero flow through the relevant procedures of the transmitter. Under the actual installation status and environmental conditions, zero point adjustment should be made on site. This is because the ambient temperature of the on-site installation is different from the temperature when it was adjusted in the laboratory before leaving the factory. In addition, changes in pipeline pressure and installation status will also have a certain impact on the zero point indication of the gas quality agency.

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