HP 5890 SERIES II Service Manual page 76

Top View (Two TCD Detectors Installed)
Use caution when removing and installing the plastic M8 tubing nuts. Excessive force
can damage them.
17. Disconnect the tubes from the solenoid valve by loosening the plastic fittings securing them.
(The fittings should only be finger- tight. If more force is required to loosen them, use a small
pair of pliers to free the fittings.) Note the solenoid valve fitting where each tube is attached.
(Corresponding tubes on the new detector must be connected to the same fittings.)
18. If a new detector is being installed, prepare the replacement detector block by pre- bending its
tubes until they are oriented similarly to those on the detector just removed.
19. If a new detector is being installed, ensure that the base and vent port of the new detector are
capped to prevent contamination.
20. Install the heater, temperature sensor, and delta- t sensor cartridges into the heated block.
21. Carefully install the detector, securing it to the instrument with two screws.
When installing tubing at the solenoid valve,
ensure that all O- rings are positioned
properly.
NOTE
When installing a series- connected TCD,
make sure its oven- return exhaust vent tube
extends into the oven.
22. Connect and tighten tubing from the detector to
the solenoid switching valve, finger- tight. En-
sure that the tubing is installed at their
proper fittings on the TCD solenoid valve.
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N.C.
FRONT OF INSTRUMENT
SVC 4- 6
COM
N.C.
N.O.
N.O.
COM
TO DETECTOR
SOLENOID VALVE
TO FLOW
BLOCK