13
The 6890 Series Gas Chromatograph
Shutting down the GC
Shutting down the GC
For less than one week
In general you can always leave the GC power on when not in use. If you will
not use the GC for up to approximately one week, conserve gases and energy
as follows:
• Reduce detector, inlet, and column temperatures to 150–200°C to save
energy.
• Turn off corrosive or potentially hazardous gas flows, such as oxygen and
hydrogen.
• Reduce flows of carrier and makeup gases.
• Turn off coolant supplies at their sources.
WARNING Never leave flammable gas flows on if the GC will be unmonitored for long
periods of time. If a leak develops, the gas could create a fire or explosion hazard.
Maintaining the instrument with a lowered temperature and reduced carrier and
makeup gas flows keeps impurities from building in your column, inlet, and
detector.
For more than one week
1. Set all heated zones to ambient temperature and turn off the detector support
gas flows. Leave the carrier gas flow on.
2. When the GC is cool, turn it off.
3. Turn off all gas and coolant supplies at their sources.
4. Remove the column and cap its ends to prevent contamination. Store the
column in a cool, dry place.
5. To prevent contamination, cap the inlet and detector column fittings.
6. If gas connections are removed from the GC, cap the intake fittings on the
back panel of the GC and on the inlet manifold.
7. If desired, replace the split vent trap filter cartridge (if present).
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