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7. TROUBLESHOOTING
Table 3. Failure Handling
NO. FAILURE CAUSE TREATMENT
1 There is no gas flow
after turn on.
1.1 Gas flow is shutting off, no gas
inputting
Check the gas sourcing and make it
open
1.2 Valve control switch is shutoff Turn the switch to CONTROL or
PURGE
1.3 No setting signal Check potentiometer or “In/Out” switch
setting position
1.4 Filter is blocked * Change a new filter
1.5 Valve failure Test or *clean valve
1.6 Circuit failure *Repair the electric circuit
2 In case of turning on
but without gas flow,
the flow rate testing is
error.
2.1 Zero excursion Adjust the zeroing potentiometer
2.2 Power supply failure *Check input/output voltages( ±
15VDC, +5.00VDC)
2.3 Sensor failure *Replace the new sensor
2.4 Amplifier or other circuits failure *Replace amplifier or repair circuit
3 In case of valve
shutting off, there is
still heavy flow rate
passing.
3.1 Over- load pressure of input
outlet, the differential pressure between
inlet and outlet is beyond rating.
Reduce the inlet operating pressure to
decrease differential pressure.
3.2 Pollution of valve *Clean valve and replace seal ring
3.3 Valve failure *Re-adjust solenoid control valve
4 The flow rate display
could not reach to full
scale flow rate value.
4.1 Pressure is lower than the rating Heighten the inlet pressure
4.2 Block of bypass *Clean bypass
4.3 Setting voltage is less than5.00V *Check the setting Voltage
4.4 Others trouble *Repair circuit etc.
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