Intelligent electromagnetic flowmeter self-diagnosis function troubleshooting

Self-diagnosis function of intelligent electromagnetic flowmeter Fault problems and troubleshooting The intelligent converter has a diagnostic function. In addition to power supply and hardware circuit faults, faults that occur in general applications can correctly give alarm information. These messages are presented with a "!" exclamation mark in the upper right corner of the display. In the measurement state, press the down button to turn the page, and the fault content is displayed as follows:

Flow rate is normal\excitation alarm\empty pipe alarm Intelligent electromagnetic flowmeter troubleshooting:

1. Instrument No display

2. Check whether the power is on;

3. Check whether the power fuse is intact;

4. Check whether the power supply voltage meets the requirements;

5. Check whether the display contrast adjustment can be adjusted and whether the adjustment is appropriate;

6. If the first three items a), b), and c) above are normal, please check the display contrast adjustment. If it cannot be adjusted, please send the adapter to the manufacturer for repair. 7. Excitation alarm 8. Whether the excitation wiring EX1 and EX2 are open circuit; 9. Whether the total resistance of the sensor excitation coil is less than 150Ω; 10. If both a and b are normal, the converter is faulty. 11. Empty pipe alarm

12. Measure whether the fluid is full of the sensor measuring pipe; 13. Use wires to short-circuit the converter signal input terminals SIG1, SIG2 and SIGGND. At this time, if the "empty pipe alarm" prompt Cancel, indicating that the converter is normal. It may be that the measured fluid conductivity or empty pipe threshold and empty pipe range are set incorrectly; 14. Check whether the signal connection is correct; 15. Check whether the sensor voltage is normal; 16. Make the flow rate zero, Observation shows that the conductivity ratio should be less than 100%; 17. When there is flow, the resistance of terminals SIG1 and SIG2 to SIGGND measured respectively should be less than 5k (measured value for the medium is water. Use a pointer multimeter to measure, and you can see the measurement process charging and discharging phenomena).

18. Use a multimeter to measure the DC voltage between DS1 and DS2 and it should be less than 1V. Otherwise, it means that the sensor circuit is contaminated and should be cleaned. 19. Upper limit alarm The upper limit alarm prompts that the output current and output frequency (or pulse) exceed the limit. You can increase the flow range and cancel the upper limit alarm. 20. Lower limit alarm The lower limit alarm prompts that the output current and output frequency (or pulse) exceed the limit. You can change the flow range to a smaller value and cancel the lower limit alarm.