LI-COR GasHound LI-800 Replacement Instructions

LI-800 GasHound
Source/Detector Replacement Instructions
1. Turn the LI-800 off. Remove the six screws on the LI-800 top panel and remove the cover.
Unscrew the tube retaining nuts on the inner air port fittings. Remove the tubing from both air ports. Leave the tubing connected
2.
to the source and detector housings.
There are ribbon cables (Figure 1 below) connected to the circuit boards on the source and detector housings. Pull straight out on
3.
the connector that is attached to each ribbon cable. The optical bench can now be removed from the foam casing.
Source
PCB
Hose Barb
Ribbon Cable
Bev-a-line Tubing
Connector
Air In
4. There are four screws on the source and detector circuit boards that must be removed. Remove the four screws in the corners of
the boards, as shown below (they are slightly larger than the other four screws). Do not remove the remaining four screws.
Remove these
4 screws
The source and detector housings (with attached circuit boards) can now be removed. The bench will appear as shown below. Be
5.
careful not to lose the O-ring on either end of the bench.
Install the source and detector housings on the gold-plated optical path cylinder. Make sure that both source and detector hous-
6.
ings have an O-ring installed, as shown in Step 5 above. The orientation of the cylinder is not important; either end can be
inserted into the source or detector housing. Note: There is no need to grease the O-ring; simply press into place.
Optical Bench
Top View
End View
O-ring
Detector
PCB
Air Out