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This will make the flame very difficult to light
and also very unstable (it will tend to extinguish
with solvent elution through the detector).
Remove the jet and examine the sealing surface.
There should be a continuous ring around the
tapered portion of the jet. Replace if necessary.
Released: April 2004
Thermal conductivity detector
Ringing on tail of TCD peaks
The purpose of this section is to describe the
causes of baseline ringing on the tail of TCD
peaks and suggest operating parameters to elimi-
nate the problem.
The 6850 GC uses a single filament TCD. The
column effluent and carrier reference gas are
switched across the TCD filament at a 5 Hz rate.
Due to the 5 Hz mechanical/pneumatic switching,
the most narrow, gaussian peak that the TCD
can be used to quantitate accurately and repro-
ducibly is 0.02 minutes.
6850 Series Gas Chromatograph Service Procedures
309
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