56
SCD and NCD User Manual
4
Operation
Shutdown
When turning off the detector for a long period of time, or to
perform maintenance on the GC or detector, shut down the
detector as follows:
1
Access the method parameters.
•
At the GC front panel, press
[Front Det]
or
[Back Det]
, or
[
Aux Det #
].
•
In the data system, select the detector in the method
editor.
2
Turn off the ozone supply gas high voltage.
3
Turn off the ozone supply gas flow.
4
Turn off the hydrogen flow.
5
For NCD only: Turn off the chiller.
6
Turn off the burner heater.
7
Turn off the base heater.
8
Turn off the oxidizer flow.
9
Turn off the vacuum pump.
10
Turn off the detector power.
11
If shutting down the GC, turn off the GC.
Alternately, create a method that turns off all detector
components, and load that method to shut down the detector.
NOTE
When shutting down, the GC will keep the vacuum pump and oxidizer
flow running until approximately 100 mL of oxidizer gas has purged the
system after the hydrogen flow is turned off. This action prevents
moisture residual contamination.
WARNING
Burn hazard. Many parts of the GC can be dangerously hot. If
performing GC or detector maintenance, turn off all heated zones
and monitor them until they reach a safe handling temperature
before turning off the GC.