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Thermionic Specific Detector
These instructions refer to the installation and operation of the Thermionic
Specific Detector (TSD) on the 3800 Gas Chromatograph. The TSD detector
tower is installed on a 3800 detector oven. The TSD Electrometer Board is
installed in the GC electronics cabinet on the left side of the instrument.
The TSD is controlled through the keyboard on the front panel of the GC.
Gas flows are controlled at the pneumatics panel of the GC, or in the
Adjustments section of the method if Detector EFC is installed.
Initial Set-Up
To set up the TSD for operation, proceed as follows:
1
Connect the air, hydrogen, and carrier gas lines to the appropriate bulkhead
fittings on the GC.
2
Check the gas supply pressures. The GC is factory set for the following inlet
pressures: air = 60 psig; H
2
= 40 psig; carrier = 80 psig. Reset the gas flow
rates if you use different supply pressures. If you are operating with capillary
columns, a make-up gas (at 80 psig) is also required. (Refer to the 3800
Pre-Installation Instructions for additional information on gas supply
requirements.)
3
Press the SETUP key on the 3800 front panel to display the Instrument
Setup Menu. Select View Instrument Setup, then Heated Zones (2) and
press Enter to display the location of all installed heated zones. The TSD
will be listed as Zone 4, 5, or 6, and its location (Front, Middle or Rear)
should appear in the Location column. Check that the location corresponds
with the physical location of the TSD electrometer board in the electronics
cabinet on the left side of the 3800, and note the location of the TSD
detector tower to which this electrometer is connected. If your 3800 GC is
equipped with detector EFC, page down to the detector EFC section of
Setup and verify the makeup gas you will be using with your TSD.
4
Install a chromatographic column in the GC (refer to the Column installation
information in the 3800 Getting Started manual). If the analytical column is
not well conditioned, use a no-hole ferrule in the detector column nut while
conditioning the column and leave the column end loose in the oven. If the
analytical column is well conditioned, follow the usual procedure for column
installation.
5
Condition the TSD bead. The following bead conditioning and optimization
procedures assume use of a short, non-polar column such as the Varian test
column, 03-912300-30 (packed) or 03-912805-99 (capillary). If you use a
different type of column, you should adjust conditions accordingly.
Operation and Operating Recommendations
TSD operation requires hydrogen, air, and either nitrogen or helium carrier
gas. The amount of hydrogen relative to the other gases will affect nitrogen-
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