330 Thermal Conductivity Detector (TCD)
Replacement procedures
18 of 24
Jun 2001
Detectors
Agilent 6890 Gas Chromatograph Service Manual
• If replacing a Type 2 manifold, the TCD adapter weldment should
not be needed.
• Be sure the left tube clears the inner edge of the bracket. See
Figure 330-16.
• Be sure all O-rings are in place.
• Be sure that the hole patterns between the mating pieces are aligned.
Tighten the gang fitting screw firmly to compress the O-rings.
Figure 330-14 Installing the TCD adapter weldment
5. If replacing a Type 1 manifold, feed the 3-way switching valve cable
through the chassis to the detector interface board. Connect it to the top
edge of the board. The connector only goes on one way.
If replacing a Type 2 manifold, connect the switching valve wires to the
existing cable.
6. Route the ribbon cable behind the manifold assembly as shown in
Figure 330-15. Then, slide the manifold and bracket assembly into the
slot until the bracket seats flush against the end of the rails. See
Figure 330-16.
TCD adapter weldment
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