CP-3800 GC Operator’s Manual
123
1
Turn the TSD Electronics and TSD Oven Power OFF. Allow the detector to
cool.
2
Turn off the main GC gas supplies to the detector at the pneumatics panel.
3
Disconnect the signal and the ignitor cables from the TSD tower.
4
Remove the two 8-32 x 3-inch tower mounting screws and lift the detector
tower vertically from the detector base until clear of the flame tip. Remove
the two 8-32 x ¼ - inch screws from the top clamp.
Note:
Use clean cotton gloves or tweezers when handling internal
parts of the TSD.
CAUTION
Avoid contamination of ceramic insulators and probes. If the detector is
not completely cool, use a metal tool (such as tweezers or a hooked
wire) to remove parts from the tower assembly.
5
Remove the upper insulator.
6
Remove the signal probe. There may be some resistance to removal, due to
the o-ring seals. Do not rotate probe as it is withdrawn from electrical
contacts in tower.
7
Remove the collector and the lower insulator with tweezers.
8
Remove the bead probe. There may be some resistance to removal, due to
the o-ring seals. Do not rotate probe as it is withdrawn from electrical
contacts in tower.
9
Carefully remove the flame tip assembly from the detector base.
10
Remove and discard the aluminum seal washer from detector base. In
some cases this washer may remain in the detector tower. If so, be sure to
remove and discard this washer so that the detector is not accidentally
reassembled with both the old washer and a new washer.
TSD
Re-assembly
Refer to Figure 18 for re-assembly orientation.
1
If you removed the detector oven from the plenum, restore the oven to its
former position and reinstall the four screws holding the oven to the plenum.
2
Install the flame tip in the detector base. This is a 0.020-inch ID ceramic
flame tip. The TSD and FID flame tips are identical. DO NOT use an
0.010-inch flame tip for the TSD.
•
If you are installing the flame tip assembly with a used Vespel® ferrule,
tighten the assembly finger-tight plus an extra 1/6-turn.
•
If you are installing the flame tip assembly with a new Vespel ferrule,
tighten about 1/3-turn past finger-tight.
3
The Vespel ferrule supplied with the GC has a maximum temperature limit of
350
°
C. If it is ever necessary to operate the detector above 350
°
C, replace
the Vespel ferrule with a graphite ferrule.
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