90 Agilent 7697A Troubleshooting
8 Electronics
Thermal Shutdowns
The headspace sampler controls the temperature for areas
including: the vial oven, the sample loop and valve, and the
transfer line. (If using the optional tray chiller, this is
another controlled zone.) If the heated zone is not within its
allowable temperature range (lower than minimum
temperature or higher than maximum temperature), an error
message displays. Depending on the severity of the problem,
the HS may also shut the zone down to prevent damage or
injury. Several things could cause a thermal shutdown:
• A problem with the electrical supply to the instrument.
• A malfunction of the zone control electronics.
• A shorted or open temperature sensor.
• A shorted or open heater.
To recover from this state:
1 Press [Status] and check for additional messages.
2 Press [Te mps ]. Look for any additional messages.
3 Scroll to the offending thermal zone, then press [Off/No]
to turn off any audible alarm.
4 Check for any issues that may have caused the problem:
• Missing thermal cover over transfer line and six port
valve
• Missing or damaged insulation on transfer line
• Missing external covers on HS
• Sample valve cover installed over heater/sensor cable
5 Power cycle the HS.
6 If the problem does not resolve, contact Agilent for
service.
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