LI-COR LI-800 Guide
1. Turn the LI-800 off. Remove the six screws on the LI-800 top panel and remove the cover.
2. Unscrew the tube retaining nuts on the inner air port fittings. Remove the tubing from both air ports. Leave the tubing connected
to the source and detector housings.
3. There are ribbon cables (Figure 1 below) connected to the circuit boards on the source and detector housings. Pull straight out on
the connector that is attached to each ribbon cable. The optical bench can now be removed from the foam casing.
Source Detector
Air In Air Out
PCBPCB
Optical Bench
Hose Barb
Bev-a-line Tubing
Ribbon Cable
Connector
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
5. The source and detector housings (with attached circuit boards) can now be removed. The bench will appear as shown below. Be
careful not to lose the O-ring on either end of the bench.
O-ring
Top View
End View
6. Install the source and detector housings on the gold-plated optical path cylinder. Make sure that both source and detector hous-
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.
LI-800 GasHound
Source/Detector Replacement Instructions
7. Carefully remove the 10-pin connector that was attached to the source housing circuit board from the main circuit board. Reat-
tach the 10-pin connector to one of the connectors shown below, depending on the length of the optical bench being installed.
Fuse
LEDs
Connector for 2”
optical bench
Source Detector
Connector for 5.5"
optical bench (not
shown, beneath
tubing)
Figure 4. Location of 10-pin connectors for 5.5" and 2" optical benches.
8Install the bench with the source side on the left as you face the front of the instrument.
9. Reattach the 10-pin connectors to the source and detector housing circuit boards. Reattach the Bev-a-line tubing to the hose barbs
on the source and detector housings, and to the flow in and out ports, if necessary.
10. Re-assemble the LI-800 case. Make sure that the foam insulation on the inside top cover is positioned over the optical bench; it is
required for thermal stability.
11. Perform zero and span calibrations as described in the LI-800 Instruction Manual Section 3, Calibration Window.
®
LI-COR, inc. ●Environmental Division ●4421 Superior Street ●P.O. Box 4425 ●Lincoln, Nebraska 68504 USA
Phone: 402-467-3576 ● FAX: 402-467-2819
Toll-free 1-800-447-3576 (U.S. & Canada)
E-mail: envsales@env.licor.com
Internet: http://www.licor.com
AKC101
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