The most common faults of the electromagnetic flowmeters produced by Kaifeng Cologne Flowmeter Co., Ltd. as instrumentation equipment are:
The zero point is unstable. Check whether the medium is full of bubbles in the measuring tube and the medium. If there is air bubble, install the air eliminator upstream. If it is installed horizontally, it can be changed to vertical installation. Check whether the grounding of the instrument is intact. If it is not good, it should be carried out. Level grounding (grounding resistance ≤100Ω); check the dielectric conductivity of the medium should be no less than 5μs/cm; check whether the medium is deposited in the measuring tube, and be careful not to scratch the inner lining when cleaning.
The flow indication value does not match the actual value. Check if the fluid in the sensor is full of tubes, with or without air bubbles. If there are air bubbles, install a getter upstream; check if the grounding is good; check if there is a valve upstream of the flowmeter, if any, move it to the downstream or make it fully open. Check if the converter range setting is correct. If not, reset the correct range.
The indications fluctuate within a certain interval. Check whether the environmental conditions have changed. If there are new sources of interference and other magnetic sources or vibrations that affect the normal operation of the instrument, remove the interference or shift the flowmeter in time; check the test signal cable and use the insulating tape for end treatment. The wires, the inner shield, the outer shield, and the housing do not contact each other.
No flow output. Check if there is any fault in the power supply part, test whether the power supply voltage is normal; test the fuse on and off; check whether the sensor arrow is consistent with the fluid flow direction, such as inconsistently change the sensor installation direction; check whether the sensor is full of fluid, if not filled with fluid, replace the pipe or install vertically The signal is getting smaller or suddenly falling. Test whether the insulation between the two electrodes is broken or short-circuited. The resistance between the two electrodes is normally between (70 ~ 100) Ω; the inner wall of the measuring tube may deposit dirt, the electrode should be cleaned and wiped, and the inner lining should not be scratched. Measure whether the pipe lining is damaged or not, if it is damaged.
Many common faults in electromagnetic flowmeters are faults caused by improper selection, improper installation, environmental conditions, fluid characteristics, etc. Some of them are faults caused by damage to the components of the instrument itself, such as display fluctuations, reduced accuracy, and even instrument damage. Therefore, when purchasing electromagnetic flowmeters , you must consult technical personnel. It is best to let the technicians install them to avoid unnecessary losses.
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