Thermal gas mass flowmeter is a high-end gas measuring instrument

Thermal gas mass flowmeter is a high-end gas measuring instrument. Thermal gas mass flowmeter is based on the principle of thermal diffusion and designed by constant temperature difference method. It is a professional gas measuring instrument. It has the characteristics of high precision, wide range, small pressure loss, direct measurement of gas standard volume flow without temperature and pressure compensation, etc., and has been widely used in various industries. Thermal gas mass flowmeter is a high-end gas measuring instrument, which has many advantages, such as wide range ratio, plug-in connection mode can be selected for large diameters, which is convenient for subsequent disassembly and maintenance, and various power supply methods, 24V or 220V are available, ground pipelines It is displayed on the ground head, the split head of the high-altitude pipeline, but not all occasions are applicable to the hot gas mass flow meter. Medium temperature. Thermal gas mass flow meters are designed based on the principle of thermal diffusion. The probe of the flowmeter is determined according to the temperature of the measured medium. Generally, the heating temperature of the probe is 50 degrees higher than that of the medium. It can be seen that the flowmeter requires the temperature of the measured medium to be relatively constant in normal measurement, and the heating current is proportional to the flow rate of the medium at this time; the second is the composition of the medium. The hot gas mass flowmeter can measure almost all single gas media (except acetylene), but there are many mixed gases to be measured in actual measurement. At this time, the hot gas mass flowmeter is selected, and the requirements for the mixed gas are high. All gas flowmeters use air as the measured medium during calibration, and a standard conversion factor can be found for a single medium. However, the mixed gas needs to calculate the conversion coefficient according to the percentage of the medium composition measured on site, but when the measurement medium composition changes, it will increase the measurement error of the flowmeter; the third is the pressure. Hot gas mass flow meters are not recommended for high pressure applications. An important point in heat measurement is the heat carried by the medium. When the site pressure is too high, the heat carried by the medium per unit volume is very large. Under the double influence of the compression system and the reaction rate, the measured value of the flow meter will be smaller than the actual use. Therefore, it is recommended that the hot gas mass flowmeter be used within 4.0mpa. The fourth is high temperature. Measuring high temperature media means that the sensor is more temperature resistant. At the same time, when measuring high-temperature media, the power consumption of the whole machine circuit increases. At present, hot gas mass flow meters can withstand high temperatures up to 400 degrees, which can meet most site requirements.

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