1, routine maintenance Periodically check the instrument, check the environment around the instrument, 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 device near the instrument or a new wire across the instrument. 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. 2, fault finding After the flowmeter starts to be put into operation or is put into operation for a period of time, it is found that the instrument is not working properly. First, check the external condition of the flowmeter, such as whether the power supply is good, whether the pipeline is leaking or is in a state of non-full pipe, whether there is air bubble in the pipe, whether the signal cable is Damage, converter output signal (ie rear position meter input loop) is open circuit. Remember to blindly disassemble the flowmeter. 3, sensor inspection Test equipment: one 500MΩ insulation resistance tester, one multimeter. Test steps: (2) In the case of lining drying, measure the insulation resistance between AC and BC 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. Requirements for the external environment 1.1. The flowmeter should be installed in a place where the temperature changes greatly or is exposed to high temperature radiation from the equipment. If it must be installed, it must be insulated and ventilated. 1.4, in order to facilitate installation, maintenance, and maintenance, there needs to be ample installation space around the flowmeter. Concerned about surprises Label: Electromagnetic flowmeter maintenance and installation precautions Previous: How to solve the problem of vacuum cleaner blockage? Next: Common faults and solutions for pumps
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(1) When the pipe is filled with medium, measure the resistance between terminals A, B and C with a multimeter. The resistance between AC and BC 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.
(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 and 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.
4, converter check
If it is determined that the converter is faulty, if there is no problem in checking the external cause, please contact the manufacturer of the electromagnetic flowmeter. The manufacturer will generally solve the problem by replacing the circuit board.
Cautions 1. Try to avoid ferromagnetic objects and equipment with strong electromagnetic fields to prevent the magnetic field from affecting the working magnetic field and flow signal of the sensor.
2, should be installed in the dry and ventilated place, to avoid sun and rain, the ambient temperature should be -20 ~ +60 ° C, relative humidity is less than 85%.
3. There should be plenty of space around the flowmeter for easy installation and maintenance.
Installation requires that the measurement principle of the electromagnetic flowmeter does not depend on the characteristics of the flow. If there is a certain turbulence and vortex in the pipeline, it will be generated in the non-measurement zone (such as elbow, tangential current limit or half-opening shut-off valve upstream) Not related to measurement. If steady-state eddy currents in the measurement zone will affect the stability of the measurement and the accuracy of the measurement, then some measures should be taken to stabilize the flow rate distribution:
a. increase the length of the straight pipe section before and after;
b, using a flow stabilizer;
c. Reduce the cross section of the measuring point.
1.2, the flowmeter is best installed indoors, if it must be installed outdoors, should avoid rain water pouring, water flooding and sun exposure, must have moisture and sun protection measures.
1.3, the flowmeter should be avoided in an environment containing corrosive gases, must be installed, there must be ventilation measures.
1.5, the flowmeter installation site should avoid magnetic field and strong vibration source, such as the pipe vibration is large, there should be fixed pipe support on both sides of the flowmeter. 