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Electromagnetic flowmeter daily inspection guide introduction

The purpose of the daily inspection is to ensure or prove that the electromagnetic flowmeter is operating under controlled conditions. The daily inspection methods generally include online inspection and offline inspection, mainly to verify whether the flow measurement value of the electromagnetic flowmeter meets and maintains the expected measurement requirements.
The application of electromagnetic flowmeters in the industry is mainly based on flow control, and the measured fluids are mostly corrosive and abrasive. In practical applications, the failure of the electromagnetic flowmeter is mostly caused by corrosion leakage, insulation degradation, electrode contamination or foreign matter adhesion.
The traditional periodic maintenance check of the electromagnetic flowmeter is to remove the flow sensor from the pipeline and check it, and then perform flow calibration. In order to reduce the flow sensor to remove the damage lining from the pipeline, first measure the insulation resistance on the pipeline to infer whether there is any abnormality, and then decide whether to remove the pipeline inspection or the actual flow calibration. General conditions (true implementation of ISO9001 quality management system) companies generally check the way: (1), 1/3 only for online inspection; (2), 1/3 to remove the pipeline to do the cleaning of the wetted parts; (3 ), 1/3 offline for flow calibration.
Check the electromagnetic flowmeter, in addition to the zero point check, separate the flow sensor, converter and connecting cable.
1, the whole machine zero check
The technical requirement for the zero check of the whole machine is: the flow sensor measuring tube is full of liquid and no flow,
2, the connection cable check
The inspection content is to check the conduction and insulation resistance of each core of the signal line and the excitation line, and check whether the grounding of each shielding layer is intact.
3, converter check
The inspection consists of using a universal instrument and an analog signal that matches the flowmeter model to provide a flow signal for zeroing and calibration.
4, flow sensor check
The inspection content is: indirectly evaluating whether the magnetic field strength changes by checking the excitation coil and checking the excitation current measured by the converter;

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