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11. If necessary, install a new fused silica liner
and Vespel ferrule. When doing so, carefully
feed the fused silica liner through the O-ring
at the top of the transfer line so as not to
damage the O-ring.
12. Carefully replace the fused silica liner, fer-
rule and tube onto the detector base. The
fused silica liner should be positioned so that
it protrudes 3 to 6 mm (1/4-inch) above the
top of the transfer tube weldment. With a
wrench, firmly tighten the transfer tube
1/2-turn past finger-tight.
13. Reinstall the heated block, the heater/sensor
cable assembly, the nut, and the ferrule. The
notch in the bottom of the block fits over the
tubing coming from the detector fitting.
Released: April 2004
14. Tighten the U-clamp screws, then tighten the
15. Place the detector on top of the instrument,
16. Connect the ignitor cable to the printed cir-
17. Install the PMT assembly (or assemblies).
18. Restore normal operating conditions.
6850 Series Gas Chromatograph Service Procedures
nut on the transfer tube.
orient it properly, and install the four screws
to hold it. Install the top cover and the
exhaust tubing.
cuit board.
188
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