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4
Install a new aluminum seal washer onto the shoulder of the detector base.
Note:
For a reliable tower seal, use a new aluminum washer each
time the detector is installed.
5
Measuring the nominal 4.0 mL/min H
2
flow for the TSD may be simplified at
this time by attaching a tube to the flame tip, and then connecting the tube to
a flowmeter. Make sure the makeup gas is turned of and adjust the
hydrogen flow. This method eliminates flow measurement errors which may
be caused by leaks due to poor seals.
6
Replace the detector tower on the detector base and secure with the two 8-
32 screws. Tighten screws alternately as tower is tightened into place.
CAUTION
Handle the ceramic insulators and probes with tweezers to avoid
contamination. Use care when handling to make sure bead probe is not
bent or dropped, as the ceramic bead on the probe is fragile.
7
Carefully insert bead probe into lower arm of detector tower. Align probe key
with tower arm slot
.
8
Secure bead probe by tightening knurled nut.
9
Insert lower insulator with shoulder down into detector tower, then insert
collector tube with grid down. Make sure the punch mark on the top edge of
the collector is toward the probe arm.
10
Insert signal probe into upper arm of detector tower. Carefully align the
spring clip with the collector. Be sure the key on the probe and the tower
arm are aligned. Secure signal probe by tightening knurled nut.
11
Assemble the upper insulator and top clamp over the collector. The O-ring
will provide slight resistance to complete insertion. Take care not to tear the
O-ring or the tower will not seal properly.
12
Look down the tower assembly to verify that the bead does not touch the
collector. Carefully adjust the collector as necessary.
13
Assemble the top clamp to the tower and secure with the two 8-32 screws.
14
Connect the signal cable to the signal probe (top) and the ignitor cable to the
bead probe (bottom). If cables were totally disconnected from the GC,
reconnect signal cable and the bead current supply cable at the top of the
TSD Electrometer Board.
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