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How long does the electromagnetic flowmeter verify?

The accuracy of the electromagnetic flowmeter is 0.2 and better than 0.2, and the verification period is 1 year. For the accuracy class below 0.2, the flow with the reference error is 2 years.

An electromagnetic flowmeter is a flowmeter that estimates the flow rate by measuring a magnetic field perpendicular to the flow direction in a closed conduit by measuring the induced electromotive force generated by the movement of the conductive liquid in the magnetic field. National Metrological Verification Regulations of the People's Republic of China JJG 1033-2007 "Electromagnetic Flowmeter" 7.4 The period specified in the verification cycle: the accuracy of the flowmeter is 0.2 and the verification period is better than 0.2, and the accuracy is less than 0.2. The stage and the flow using the reference error are estimated to be 2 years.

The electromagnetic flowmeter works according to Faraday's law of inductance, and 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 velocity of the liquid, and the flow area. However, the magnetic field strength cannot be measured and is not constant, and the electromagnetic flowmeter is not completely identical in each structure, so only one flow coefficient can be calculated. If you want to achieve higher accuracy, you must perform real-flow calibration.

Calibration of the instrument is required. After the instrument is used for a long time, the electronic components will drift with the influence of ambient temperature and moderateness, and the corresponding magnetic field will also change. This requires calibration and calibration to see if the accuracy is met. Claim.

The time of calibration mainly depends on your working conditions, such as high measurement requirements, impurities and dirt in the fluid, and poor environmental conditions. Electrode fouling, affecting measurement, cleaning, and inaccurate measurement after repair can be performed. Inspection, if the working conditions are good and the long-term use is normal, there is no need to check. If you need to verify, call to inform you, we let the technology to verify.   If you say that in the process of use, how to verify the accuracy of the electromagnetic flowmeter is not allowed, then only choose the contrast method, that is, a pipeline with two flowmeters, of course, the accuracy of the electromagnetic flowmeter is high or similar, and compare each other.

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