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『Flow meter maintenance』Related information(v cone flow meter|rotary gas meter|gallon meter|gear meter|metal tube rotameter|glass tube rotameter|nutating disk meter|transit time ultrasonic flow meter|wedge flow meter|pd meters|hydraulic flow meter|ultrasonic water flow meter|water flow meter|air flow meter|magnetic water flow meter|oxygen flow meter|gas flow meter|argon flow meter|air velocity meter|gasoline flow meter|fuel flow meter|ultrasonic water meter|digital water meter|nitrogen flow meter|solid flow meter|Oxygen tank flow meter|digital water flow meter|diesel fuel flow meter|steam flow meter|02 flow meter|compressed air flow meter|oil flow meter|liquid flow meter)
1. How to maintain electromagnetic flowmeter
1. Daily maintenance only requires periodic visual inspection of the instrument, checking the surrounding environment of the instrument, removing dust and dirt, ensuring no water or other substances enter, checking whether the wiring is good, and checking whether there are new strong electromagnetic field devices or new wires crossing the instrument near the instrument. If the measuring medium is prone to contaminating the electrode or settling or scaling inside the measuring tube wall, regular cleaning and cleaning should be carried out.
2、 After the flowmeter is put into operation or has been in normal operation for a period of time, if it is found that the instrument is not working properly, the external condition of the flowmeter should be checked first, such as whether the power supply is good, whether the pipeline is leaking or in a non full state, whether there are bubbles in the pipeline, whether the signal cable is damaged, and whether the output signal of the converter (i.e. the input circuit of the rear instrument) is open circuit. Remember to blindly disassemble and repair the flowmeter.
3、 Sensor inspection and testing equipment: one 500M Ω insulation resistance tester with an excitation pin and one multimeter. Test Procedure:
(1) With the pipeline filled with medium, use a multimeter to measure the resistance between terminals A, B, and C. The resistance between A-C and B-C should be equal. If the difference is more than 1 times, it may be due to electrode leakage or condensation water adsorption on the outer wall of the lead chain tube or inside the junction box.
(2) When the lining is dry, use an M Ω meter to measu
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(1) is normal, it may be that the outer wall of the measuring tube is damp, and a hot air blower can be used to dry the inside of the shell.
(3) Use a multimeter to measure the resistance between X and Y. If it exceeds 200 Ω, the excitation coil and its lead may have an open circuit or poor contact. Remove the terminal board for inspection.
(4) Check the insulation resistance between X, Y, and C, which should be above 200M Ω. If there is a decrease, dry the inside of the shell with hot air.
. During actual operation, the decrease in coil insulation will lead to increased measurement errors and unstable instrument output signals.(5) If it is determined that the sensor has a fault, please contact the electromagnetic flowmeter manufacturer. Generally, it cannot be solved on site and needs to be repaired by the manufacturer.
4、 If it is determined that the converter is faulty during the converter inspection and there are no external issues, please contact the electromagnetic flowmeter manufacturer. The manufacturer usually solves the problem by replacing the circuit board.
2. Maintenance and upkeep of natural gas flow meters
The maintenance and upkeep of natural gas flow meters should be