Seek help regarding faults and alarms in electromagnetic flowmeters
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The Zhejiang Diyuan electromagnetic flowmeter triggered an excitation loss alarm; after restarting, the alarm disappeared, but the flow rate increased by 50%. What is the reason? How to solve it?
Excitation alarm – it might be a quality issue with this meter. Electromagnetic flowmeters are relatively complex to work with, and there are many factors to take into consideration
Use a multimeter to check the sensor coil; an excitation alarm usually indicates a problem with the sensor coil； Sensor check: (Perform the check after disconnecting the signal cable from the converter) The resistance value between CD1 red and CD2 yellow should be around 50-60 ohms ； The insulation resistance between red and SIGGND metallic color is infinite ； The insulation resistance between SIG1 white and the shielded wire DS1 is infinite ； The insulation resistance between SIG2 blue and the shielded wire DS2 is infinite ； The resistance value between SIG1 white and SIG2 blue is infinite when no water is flowing in the pipeline, and it is around 20–200 K ohms (depending on the diameter) when water is flowing