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The total valve has been closed, but the flow meter still ha

The airport hotel in the airport's energy center USES frozen water to handle the air. In the winter, the freezing water closes and the hotel's freezing water valve closes, but the electromagnetic flowmeter shows the flow
Electromagnetic flow meter installed in total freeze the downstream of the valve, due to the problem of installation, cause electromagnetic flowmeter after closed the valve parts atc, the electrode impedance electrode exposed in air enlarged form false signals, found the problem, after the scene to open the instrument air resistance after alarm indicator system after detecting the naked, to atc system automatically prompt alarm, and stop the instrument measurement, the normal work of the instrument and display to zero