Routine Maintenance: General
Maintenance schedule
Released: March 2004 6850 Series II GC User Information page 102 of 256
Maintenance schedule
Periodically clean the surface of the instrument with a dampened lintless cloth.
Do not get any water inside the instrument.
The frequency of maintenance depends upon:
• The level of usage
• The type of samples injected
• Whether injections are manual or automatic
• Whether the instrument is used for multiple applications or dedicated to
one
• Other environmental factors, such as dirt, ambient temperature, etc.
Table 23. Maintenance Schedule
Maintenance frequency Items
Daily Change septa, run a calibration sample, check the tightness of liner and
column nuts.
1
Weekly Change glass liners and O-rings, if applicable.
Monthly Clean the split/splitless inlet vent line trap.
Perform a leak check for hydrogen. Check all connections from the initial
supply. At the GC, leak check the inlet and the column connections to the
inlet and detector.
Quarterly
Renew gas cylinders.
2
Semiannually Clean detector.
If a µECD is installed, perform a radioactivity wipe test.
Annually Recondition or replace internal and external traps and chemical filters.
1
Very important for temperature programming using Vespel or Vespel/graphite ferrules
2
With typical usage, A-size cylinders will supply four gas chromatographs for about
3 months. Replace the cylinder when its pressure drops below 500 psig.
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