When selecting a gas mass flowmeter, you need to pay attention to several aspects

When selecting a gas mass flowmeter, you need to pay attention to the following aspects: 1. The passing medium. Gas flow meters are suitable for various gases, including special gases and corrosive gases. Take corrosive gas as an example: when the corrosive gas passes through the flowmeter, if the flowmeter has not been specially treated, it will cause failures in sealing elements and other aspects due to the characteristics of the corrosive gas, thus affecting the normal use of the flowmeter. When selecting media with relevant characteristics, special attention should be paid to sealing materials and other information, such as all-metal seals, ammonia-resistant rubber and other sealing materials. In addition, combustible gases such as hydrogen and methane need to pay attention to the problem of explosion point caused by excessive gas concentration. 2. Measuring range (or called flow range). When selecting a flowmeter, first determine the range of the required flowmeter. Take the products of HORIBAMETRON (Horiba Huibolong) as an example: the company's products are calibrated with nitrogen (N2), if other gases need to be converted , for non-nitrogen medium, convert the conversion coefficient between nitrogen and the gas to determine the calibration flow. 3. Pressure range. The withstand pressure range of HORIBAMETRON flowmeter is 3MPa, and the differential pressure range is (0.05-0.3) MPa. It can be installed and used directly without any compensation within 3MPa; it should be noted that some industries need to work under high pressure, and it is necessary to clarify whether the pressure range is satisfied. 4. Interface diameter. When selecting the interface, you need to choose according to the pipeline conditions. For now, Ф3mm～Ф10mm, 1/4″Swagelok (or VCR), hose joints Ф4mm～Ф10mm, etc. are the main ones. 5. Power supply voltage and control. The flow rate of HORIBAMETRON is used As far as the meter is concerned, the power supply voltage is ±15V and 24V. The control interface has 9 pins and 15 pins, as well as 9 holes and 15 holes. 6. Communication protocol. Compared with digital flow meters, it is often involved Communication protocol issues, with MODBUS, Profibus, DeviceNet as the standard, pay attention to the protocol type when choosing. Remarks (some industries can meet the requirements by selecting flow meter analog control) need to pay attention.

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