Verifying Performance
TCD Checkout
Released: March 2004 6850 Series II GC User Information page 56 of 256
GC setup
Warning If the unit has been in operation, areas may be hot enough to cause serious
burns. Switch off the heated zones and the oven and allow sufficient time for
the unit to cool.
1. If you are using a split/splitless inlet, install a new septum, a new split
liner, and a new O-ring seal in the inlet. See “To install a liner and O-ring”
on page 120.
If you are using a purged packed inlet, install a new liner and glass insert
for the checkout column. Also install a new septum and O-ring. See
“Changing septa” on page 121 and “Changing the O-ring” on page 142.
If you are using a cool on-column inlet, install a new septum, then check
for a proper fit of the needle in the column. See “Changing septa” on
page 121 and “Cleaning the inlet” on page 131.
If you are using a PTV inlet with the septum head, install a new septum or
microseal, inlet adapter, silver seal, and glass liner. See “Changing septa”
on page 121, “Replacing liners” on page 157, and “To replace the inlet
adapter” on page 150.
If you are using a PTV inlet with the septumless head, clean the head and
replace the Teflon ferrule and glass liner. See “Cleaning the septumless
head” on page 152, “Replacing the Teflon ferrule” on page 154, and
“Replacing liners” on page 157.
2. Install the 6850 evaluation column.
3. If present, remove the protective cap from the TCD exhaust vent at the top
of the detector and the caps on the inlet manifold vent(s).
ChemStation setup
1. Bring up the proper on-line instrument for the 6850 to be tested. Make
these settings:
2. Enter the parameter values listed in Table 17.
Path Setting
View/Run Method/Control View/Instrument/
Edit Parameters/Options
Keep instrument keyboard locked after method is
loaded? = No
View/Run Method/Control View/Instrument/
Edit Parameters/Signals
Assign Signal 1 to the detector
Choose Save Data All
Data rate = 5 Hz
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