What are the reasons for inaccurate gas flow meter testing?

What are the reasons for inaccurate gas flow meter testing? Gas flowmeter is a commonly used gas measuring instrument, mainly for measuring gas, air, nitrogen, hydrogen, etc. Two parallel pipelines, when the main network uses gas, the manual valve of the branch network is closed. The gas flow meter measures normally. When the sub-pipe network is also using gas, the manual valve is opened. Since the gas in the main pipeline is partly diverted from the sub-pipe, the air pressure in the main pipeline will drop, so that the pressure in front of the flowmeter is lower than the pressure behind the meter. The flow meter is reversed, causing double metering. Do you know what are the reasons for the inaccurate gas flowmeter test? 1. Long-term use and pipeline vibration; Various factors cause the moving parts of the float flowmeter to loosen, such as the sensing magnet, pointer, counterweight, and rotating magnet, resulting in large errors. Solution: You can first verify by pushing the pointer with your hand. First press the pointer at the RP position to see if the output is 4mA and the flow rate display is 0%, and then verify according to the scale in turn. If discrepancies are found, position adjustments can be made to the components. Generally, professionals are required to adjust, otherwise the position will be lost, and it needs to be returned to the factory for correction. 2. The density of the liquid medium changes greatly; before the rotameter is calibrated, the medium is converted according to the density given by the user, and converted into the flow rate of water under the calibration state for calibration. Therefore, if the density of the medium changes greatly, it will cause a large error in the measurement. The solution can be to bring the changed medium density into the formula, convert it into an error correction coefficient, and then multiply the flow rate measured by the flowmeter by the coefficient to replace it with the real flow rate, so here it is necessary to be certain when selecting and purchasing the flowmeter. To provide accurate media density. 3. The gas medium is greatly affected by temperature and pressure; Rotameters are calibrated before leaving the factory, and customers generally need to provide working temperature, pressure, fluid density, etc. Flowmeter manufacturers generally calibrate the flow rate according to the temperature and density of the medium provided by the user. The liquid is fine, but the gas medium is greatly affected by temperature and pressure, so the user needs to provide accurate and commonly used temperature values. 4. The installation does not meet the requirements; Generally, glass rotameters are installed vertically, and the inclination angle of the flowmeter cannot exceed 20 degrees during installation.

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