VICI D-2-IM - Manual (Page 18)

14
Connecting the Discharge Gas to the Detector
1. If you are supplying the GC from the helium purifier, use the Valco tee (ZT1).
Otherwise, use one of the Valco 1/16" unions (ZU1) to connect the outlet tube
of the purifier to the inlet of the supplied discharge gas restrictor (TGA-R-10F60P).
2. Connect the outlet end of the restrictor to a flow measuring device and adjust
the helium pressure to obtain a flow of and ~10 mL/min for the PD-D2-IM.
3. After setting the flow rate, connect the outlet of the restrictor to the discharge
gas inlet tube at the top of the detector.
Column Connection
The type of column used will determine the parts needed to connect the column.
If a metal capillary or micropacked column is the column of choice, then a packed
column adapter (I-23642-D2-IM) is required. This inlet provides a 1/16" fitting detail
for external connection of the column to the detector with the appropriate ferrule
or fused silica adapter. The same adjustability is offered for column insertion depth
using this adapter.
If a fused silica capillary column is used, the outlet end of the column is inserted
directly into the column at an insertion depth of 7 cm. Instructions below are for
the use of fused silica capillary column.
1. Make a mark on the column 7 cm from the end.
2. Remove the knurled nut and plug from the column inlet manifold at the bottom
of the detector. Slide the nut over the end of the column, followed by the
appropriate column ferrule (FS.4 or FS.5, or ZF.5V for megabore).
3. Insert the column through the column inlet manifold at the bottom of the
detector. Slide it in until the mark is flush with the surface of the knurled nut,
and secure the column by tightening the knurled nut fingertight only.
Testing for Leaks
It is critical for the system to be leak-tight, and an additional check at this point can
save many headaches later on. To test for leaks:
1. Cap the vent outlet tube.
2. Pressurize the entire system with helium to 138 kPa (20 psi).
3. If the system does not hold pressure, check all the fittings with an electronic
helium leak detector. DO NOT use leak detecting liquids.
4. Tighten fittings as required. (Further leak testing is described on page 17 in the
section entitled “Checking for Leaks in the Discharge Gas Plumbing”).
Installation