Ametek 931S

6-62 | Model 931S / Model 932S UV Analyzers
Decimal Alarm
Bit Value Type Alarm Condition / Description and Suggested Corrective Action
0 1 Fault f: Filter wheel speed out of range
There is no signal from the Chopper (Filter) Wheel opto-interruptor, or the
Chopper Wheel speed is outside the normal range of 240–600 RPM.
Note: This alarm is used only by Model 932S Multi-Gas Analyzers.
Corrective Action:
Take appropriate safety precautions, open the Upper Enclosure, and:
• Check the power (15 V) on the opto-coupler cable to ensure there is power
being supplied to the Chopper Motor.
• Check the opto-coupler cable to the Chopper Assembly for proper connections
and inspect it for damage (cuts, nicks, burn marks, etc.).
• Check the power on the Chopper Motor. Contact AMETEK to verify
operation before checking.
• Check the snap ring for the Chopper Shaft and ensure it is snug against
the bushing and/or check the Chopper Bearings (see “Chopper Assembly
Maintenance” in this chapter). Contact AMETEK to verify operation before
checking.
• Replace the Microcontroller board. Contact AMETEK to verify operation
before removing this board.
1 2 Fault f: On-board A/D not responding
One or both of the Microcontroller board’s discrete analog-to-digital converters
(A/D) is not responding.
Corrective Action:
Take appropriate safety precautions, open the Upper Enclosure, and:
• Replace one or both of the A/D converters. Contact AMETEK to verify
operation before removing these components.
• Replace the Microcontroller board. Contact AMETEK to verify operation
before removing this board.