Common faults of electromagnetic flowmeter

Operational faults of electromagnetic flowmeter after the initial adjustment and normal operation for a period of time, the faults appear in the operation period, rare causes include: flow sensor inner cavity adhesion layer, lightning strike, natural environment standard changes.

Electromagnetic flowmeter

1. Lumen adhesion layer

Due to the electromagnetic flowmeter accurate measurement with floating solid or dirty body than other total flow meter more, the emergence of internal cavity adhesion layer fault probability is also ** higher.If the conductivity of the attached layer is similar to that of the liquid, the instrument can also enter data signals normally, only changing the total circulation area of goods, leading to the potential fault of data error.If the high conductivity adhesion layer, electromotive force between electrical stages will be short circuit fault;If the dielectric strength is attached to the layer, the electrical surface is cut off by the insulating layer.The latter two views will render the instrument unable to perform daily tasks.

Lightning strike

Lightning strike in the route of the magnetic induction brake when high working voltage and inrush current, into the instrument will destroy the instrument.The lightning damage meter has three leading roads: power plug, total flow power line and excitation current line between the controller and converter.However, the analysis of the parts destroyed in the lightning fault shows that the high working voltage and surge current caused by the fault are mostly imported from the switch power line of the control room, and the other two roads are less.From the onset of lightning mutiny learned on the spot, not only the electromagnetic flowmeter fault, grasp the room of other instruments often appear in addition to lightning mutiny.Therefore, the application of enterprises to understand the need to set the control room instrument power plug lightning protection equipment.The new design solution enterprise team and research to solve this problem.

3. Change of natural environment standards

The key causes are the same as the natural environment of the fault during the regulation period, only the source of the disturbance does not emerge during the regulation period and is re-infected during the operation period.Such as a grounding device bunker is not imaginary electromagnetic flowmeter, adjust period because there was no factory source, instrument operation everything is normal, but in the operational phase of the emerging new intrusion source (such as control points measuring full line or a distant push pipe arc welding) intrusion all normal operation, springing up sharply lax type data signal.