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Description of routine maintenance of electromagnetic flowmeter

Daily maintenance of electromagnetic flowmeter

Daily, only need to periodically check the electromagnetic flowmeter, check the environment around the electromagnetic flowmeter, remove the dirt, ensure that no water and other substances are inspected, check whether the wiring is good, check whether there is a new strong electromagnetic field equipment near the electromagnetic flowmeter or a new installation. The wires straddle the meter. If the measuring medium is easy to contaminate the electrode or precipitate or scale in the measuring tube wall, it should be regularly cleaned and cleaned.

After the electromagnetic flowmeter starts to be put into operation or put into normal operation for a period of time, it is found that the electromagnetic flowmeter is not working properly. First, check the external condition of the electromagnetic flowmeter, such as whether the power supply is good, whether the pipeline leaks or is in a state of non-full tube, and whether there are air bubbles in the pipeline. Whether the signal cable is damaged or not, and whether the converter output signal (ie, the rear instrument input circuit) is open. Remember to blindly dismantle the electromagnetic flowmeter.

Electromagnetic flowmeter sensor inspection

Test equipment: one 500MΩ insulation resistance tester, one multimeter.

Test steps:

(1) When the pipe is filled with medium, measure the resistance between terminals A, B and C with a multimeter. The resistance between A-C and B-C should be equal. If the difference is more than 1 time, there may be leakage of the electrode, condensation on the outer wall of the measuring tube or the junction box.

(2) In the case of lining drying, measure the insulation resistance between A-C and B-C with MΩ meter (should be greater than 200MΩ). Then use a multimeter to measure the resistance of the two electrodes in terminals A and B and the measuring tube (should be in short-circuit communication). If the insulation resistance is small, indicating that the electrode is leaking, the entire flowmeter should be returned to the factory for repair. If the insulation is reduced but there is still more than 50 MΩ and the inspection result of step (1) is normal, the outer wall of the measuring tube may be damp, and the inside of the outer casing may be dried by a hot air blower.

(3) Use a multimeter to measure the resistance between X and Y. If it exceeds 200 Ω, the excitation coil and its lead wire may be open or poorly connected. Remove the terminal block check.

(4) Check the insulation resistance between X, Y and C, which should be above 200 MΩ. If it is lowered, dry the inside of the casing with hot air. In actual operation, the decrease in coil insulation will result in increased measurement error and unstable instrument output signal.

(5) If it is determined that the sensor is faulty, please contact the manufacturer of the electromagnetic flowmeter. The general site cannot be solved and needs to be repaired by the manufacturer.

Electromagnetic flowmeter converter check

If it is determined that the electromagnetic flowmeter converter is faulty, if there is no problem in checking the external cause, please contact the company, the manufacturer will generally solve the problem by replacing the circuit board.

Electromagnetic flowmeter electrode maintenance

1. Before using the electromagnetic flowmeter, first calibrate the electromagnetic flowmeter with a standard pH solution. Before the calibration, before operation, you must pay attention to clean the electrode of the electromagnetic flowmeter with distilled water, and then clean the electrode again with the test liquid.

2. If you do not use the electromagnetic flowmeter, when you want to remove the electrode of the electromagnetic flowmeter, you should be careful not to let the electrode of the electrode collide with the hard object, otherwise the damage will affect the use of the electrode.

3. After using the electromagnetic flowmeter, you should put the electrode of the electromagnetic flowmeter on the sleeve, and put less saturated solution inside, just make sure that the bulb of the electrode is wet, but remember not to put it in distilled water. soak.

4. It is usually necessary to keep the electrode clean and do not let the output on both sides of it appear a short circuit. Otherwise, the measurement will be inaccurate and affect the use of the electromagnetic flowmeter.

In fact, there are still many ways to maintain the electrodes of the electromagnetic flowmeter. Everyone should pay more attention to the use process. Do not use the small negligence of the electromagnetic flowmeter in the future.

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