6-74 | Model 933S UV Analyzer
Decimal Alarm
Bit Value Type Alarm Condition / Description and Suggested Corrective Action
3 8 Warning w: Bench temperature out of range
The Optical Bench temperature has exceeded its Too Hot setpoint or has fallen
below its Too Cold setpoint, or the Optical Bench temperature range is not
set properly. 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 Bench Too Hot and Too
Cold setpoints. Also, check the Bench temperature Range; it should be set
to the Optical Bench Temp Range indicated on the Analyzer Programming
Parameters sheet included in the analyzer Documentation Package. See
“Temperature Control” in Chapter 4.
Perform the following checks:
• Check the ambient temperature around the analyzer; if it is higher than the
Too Hot setpoint or lower than the Too Cold setpoint, adjust the surrounding
temperature so that it is not more than 8 °C below the Bench Setpoint.
Take appropriate safety precautions, open the Electronics Enclosures, and:
• Check the jumpers at JP301 on the Micro-Interface board for proper
temperature range setting. The typical default jumper setting is Range “A”
(jumpers 2-3). See “Temperature Control” in Chapter 4.
• Check the Optical Bench RTD (Upper Enclosure, Figure 6-1) for a short or
open circuit. Replace the RTD, if necessary. Contact AMETEK to verify
operation before removing this part.
• Check the heater control circuit:
- Check fuse F4 on the AC Distribution board (Figure 6-16) in the Lower
Enclosure. Replace if necessary.
- Check the OverTemp switch on the Optical Bench (see Figure 6-1). If the
plunger has popped out, press it to reset it.
• Replace the Micro-Interface board. Contact AMETEK to verify operation
before removing this board.
Setup (tab)Temp
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