Tap water electromagnetic flowmeter why cycle testing

Many devices require regular testing, and electromagnetic flowmeters are no exception. So why do electromagnetic flowmeters need regular inspection?

Electromagnetic flow meters are formulated based on Faraday’s law of electromagnetic induction. The flow rate is related to the electromotive force generated by the liquid flow, and this electromotive force is related to the magnetic field strength, the flow rate of the liquid and the flow area. . However, the magnetic field strength cannot be measured and is not constant, and the structure of each electromagnetic flowmeter is not exactly the same, so we can only roughly calculate a flow coefficient. If you want to achieve higher accuracy, real flow calibration must be performed.

Regular calibration of electromagnetic flowmeters: In order to ensure the accuracy of the flowmeter, we conduct regular calibrations. Usually we use higher-precision portable flowmeters for direct comparison and use the measured data for calculations. , error = (measured value - standard value) standard value, use the calculated relative error and correction coefficient to make the measurement error fully +2%, which can meet the measurement requirements. This operation is simple and convenient, and can effectively improve the accuracy of measurement.

Since the tap water industry is in continuous production, uninterrupted measurement is extremely important. Therefore, flow meters generally installed on pipelines cannot be frequently disassembled and submitted for inspection. This approach is to use portable ultrasonic meters with higher accuracy. The flow meter is sent to the national certification unit for calibration on a regular basis. It is used as the company's standard instrument, and the online flow meter is regularly tested through comparison. This requires designers to consider the needs of future production management based on the requirements of the user unit when designing.