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Manual 111-082010_Nall Mass Flowmeters Page 10 of 23
4.4.3 Electrical Zero Check
Turn the power supply “ON” and allow the flowmeter 30 minutes to warm up. Stop all flow through the
transducer and check the electrical zero.
CAUTION: DO NOT ASSUME THAT ALL METERING VALVES WILL COMPLETELY
SHUT OFF FLOW. EVEN A SLIGHT LEAKAGE THROUGH A VALVE WILL CAUSE AN
INDICATION ON THE METER WHICH WILL FALSELY APPEAR TO BE A ZERO SHIFT.
If necessary, adjust the “ZERO” potentiometer located on the front panel of the power supply, until the
meter indicates zero.