A common failure analysis flow meter
1, the pipeline failures: flowmeter has a front length, if change the length of pipeline in front not enough is easy to cause measurement error. Presence of impurities or medium crystal can cause the change of the fluid state, which may lead to a measurement error. 2, moving zero and span drift: preliminary debugging or use after a period of time some components must be aging, there will be still zero and span is not consistent. Generally adopts the static adjust zero, namely no medium flow in the pipe when the zero point, range are available and a half or close to full scale adjustment, pay attention to try not to use full range adjustment. 3, line fault: generally happens in flowmeter and the line be affected with damp be affected with damp without change or no change rules, slight be affected with damp be affected with damp can be used in the case of constant electric blower is blown dry. Flow meter is used analog signals, especially the electromagnetic flowmeter need very strict shielding protection, if have shielding grounding fault will cause measurement error. 4, false failure: general flow meter more accurate is half range to 2/3 of stable measurement, the instantaneous flow rate change is slow, small fluctuations. Flowmeter for 1/10 range below the range of measurement is not very reliable, if flow meter long in low range measurement and measurement of the fluctuation in large, there is a big measurement error, the volatility is
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