problem persists for two seconds or more. The inlet heater controller is shut down. This fault is non-
recoverable i.e. the fault must be addressed and the instrument powered off and then on again.
12.2.2 Inlet Earth Fault
The error message INJ EARTH FAULT is generated when the inlet thermocouple loses its connection
to the body of the inlet, if the inlet TC connection to the OPTIC-4 control unit is lost or if the earth
connection between the inlet base and GC chassis is broken. This error is displayed in the status
pane if the problem persists for two seconds or more. The inlet heater controller is shut down. This
fault is non-recoverable i.e. the fault must be addressed and the instrument powered off and then
on again.
12.2.3 Inlet Overpower
The error message INJ OVERPOWER is generated when the application of full power for more than
25 sec does not bring the inlet temperature to the set point. This error is displayed in the status pane
if the problem exists for two seconds or more. The inlet heater controller is shut down. This fault is
non-recoverable i.e. the fault must be addressed and the instrument powered off and then on again.
12.2.4 Inlet Temperature above Maximum
The error INJ TEMP ABOVE MAX message is generated when the inlet temperature exceeds the
maximum temperature of 650°C. This error is displayed in the status pane if the inlet temperature is
above 650°C and is rising. The inlet heater controller is shut down. This fault is non-recoverable i.e.
the fault must be addressed and the instrument powered off and then on again.
12.2.5 Cryotrap Thermocouple Fault
The error message CRYO TC FAULT is generated when the cryotrap thermocouple fails, or if the
cryotrap TC connection to the OPTIC-4 control unit is lost. This error is displayed in the status pane if
the problem persists for two seconds or more. The cryotrap and inlet heater controllers are shut
down. This fault is non-recoverable i.e. the fault must be addressed and the instrument powered off
and then on again.
12.2.6 Cryotrap Earth Fault
The error message CRYO EARTH FAULT is generated when the cryotrap thermocouple loses its
connection to the body of the trap, if the cryotrap TC connection to the OPTIC-4 control unit is lost
or if the earth connection between the cryotrap base and OPTIC controller is broken. This error is
displayed in the status pane if the problem persists for two seconds or more. The cryotrap heater
controller is shut down. This fault is non-recoverable i.e. the fault must be addressed and the
instrument powered off and then on again.
12.2.7 Cryotrap Overpower
The error message CRYO OVERPOWER is generated when the application of full power for more
than 25 sec does not bring the trap temperature to the set point. This error is displayed in the status
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