As a liquid flow measuring instrument, electromagnetic flowmeter is very important to ensure its measuring accuracy. In order to effectively ensure the measurement accuracy of the liquid flowmeter, we need to pay attention to the following points:
1. The AC potential measured by the electrode of the liquid flowmeter is based on the liquid potential in the flowmeter. In order to stabilize the liquid potential and maintain equal potential between the flowmeter and the fluid to ensure stable measurement, the flowmeter housing and the metal tube should be well grounded, and the converter housing should also be grounded.
2. In order to ensure that the measuring tube of the flowmeter is filled with the measured medium, the flowmeter is installed vertically and flows from bottom to bottom. Especially for liquid-solid two-phase flow, it must be installed vertically. If only horizontal installation is allowed on site, ensure that the two electrodes are in the same horizontal plane.
3. The installation site of the liquid flowmeter should avoid AC and DC strong magnetic field and vibration, the ambient temperature is -20 ~ 50 ° C, does not contain corrosive gases, and the relative humidity is not more than 80%.
4. In order to avoid the influence of the relative measurement of the flow rate, the flow control valve should be set downstream of the flow meter. For small-caliber flowmeters, because the distance from the center of the electrode to the inlet end of the flowmeter is equivalent to several times the length of diameter D, the upstream straight pipe can not be specified. However, for large diameter flowmeters, generally the upstream should have a straight pipe section of more than 5D, and the downstream generally does not require a straight pipe section.
