6-58 | Model 933 UV Analyzer
Alarm Type / Alarm Condition Description and Suggested Corrective Action
Fault Chip ADC The Host Controller board’s internal analog-to-digital converter (ADC) is not
responding.
Corrective Action:
Take appropriate safety precautions, open the Lower Enclosure, and:
• Replace the Host Controller board. Contact AMETEK to verify
operation before removing this board.
Fault Column Temp Lo The Column Block temperature is below the column temperature Too Cold
setpoint. This alarm may occur during a cold start, but will clear after the
temperature zone has stabilized within its normal operating range.
Corrective Action:
• From the Temperature Control dialog box, check the Column Setpoint
and Too Cold setpoint.
• Check the ambient temperature around the analyzer; if it is lower than
the Too Cold setpoint, adjust the surrounding temperature to within the
Column Block measuring range (see “Temperature Control” in Chapter 4).
Take appropriate safety precautions, open the Electronics Enclosures, and:
• Check the heater control circuit:
- Check fuse F3 on the AC Distribution board in the Lower Enclosure
(Figure 6-14). Replace if necessary.
- Check the OverTemp switch on the Optical Bench (Upper Enclosure,
Figure 6-1). If the plunger has popped out, press it to reset it.
• Check the Column Block RTD for a short or an open circuit (see
“Column Block Maintenance” in this chapter). Replace the RTD, if
necessary. Contact AMETEK to verify operation before removing this
component.
Setup (tab)Temp
Control
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