The 6890 Series Gas Chromatograph
Maintenance information
10
Maintenance schedule
The frequency of maintenance depends upon:
• The level of usage of the GC
• 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 3 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 the 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 detectors, perform wipe test on ECD
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 two dual-channel chromatographs for about
three months. Replace the cylinder when its pressure drops below 500 psig.
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