Detectors
6850
6850
Released: April 2004 6850 Series Gas Chromatograph Service Procedures 183
When cleaning or replacing the jet, it is not
necessary to disconnect any plumbing, igni-
tor leads or the heater/sensor. Leave all
attached and disconnect the detector block
from the transfer line at the Swagelok
fitting, then gently lift the block and rotate it
enough to access the jet.
9. Remove and inspect the jet assembly. It can
be pulled straight out but rotating it slightly
helps to free it. The jet assembly slips out of
the FPD block more easily if the block is still
warm. Use a wire or brush to remove any
deposits.
10. Use compressed air or nitrogen to blow out
loose particles from the jet and/or detector
module body.
11. Inspect and clean deposits from the jet bore
using a suitable wire. If the jet is damaged in
any way, it should be replaced. It is good
practice to replace the jet, rather than try to
clean it, particularly when extremely high
sensitivity is required.
12. A new O-ring seal must be used when rein-
stalling the jet into the burner chamber.
Caution
Be careful not to crush or side-load the fused
silica liner when reinstalling the detector.
13. Reassemble all parts of the detector module;
reassemble the module onto the instrument.
A new Vespel ferrule should be used to seal
the detector module to the transfer line.
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