LI-COR LI-840 Leitfaden

LI-840 CO2/H2O Analyzer

The LI-840 source and detector housings are located on opposite ends of the optical bench, and can be easily replaced should the need

arise. Follow these steps to replace the source and/or detector in the LI-840:

1. Turn the LI-840 off. Loosen the six screws on the LI-840 top panel and remove the cover.

2. Unscrew the tube retaining nuts on the inner air port fittings. Remove the tubing from the air port(s). Leave the tubing connected

to the source and/or detector housings; the old housing and tubing will be discarded.

3. There are ribbon cables (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 other end of the ribbon cable can remain attached to the main circuit board.

The optical bench can now be lifted away 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 board, 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/or detector housing (with attached circuit board and tubing) can now be removed and discarded. 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

LI-840 CO2/H2O Analyzer

Source/Detector Replacement Instructions

(over)

6. The source goes on the left side of the optical bench as you face the instrument (below). Make sure that both source and detector

housings have an O-ring installed, as shown in Step 5 above. The orientation of the optical path 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.

7. There are spare pre-formed pieces of Bev-a-line tubing included with your instrument. Attach the long end of the pre-formed

tubing to the hose barb on the new source (or detector). Re-attach the source and/or detector housing to the optical bench using

the 4 screws removed in step 4. Attach the other end of the pre-formed tubing to the inner air port fitting(s). Re-attach the ribbon

cable connector to the source and/or detector housing circuit board(s). Replace the optical bench assembly in the foam enclosure.

Figure 4. Remove inner air port fitting nuts and remove tubing. Disconnect ribbon cable and remove source or detector.

8. Re-assemble the LI-840 case. Make sure that the foam insulation on the inside top cover is positioned over the optical bench; it is

required for thermal stability.

9. Perform zero and span calibrations as described in the LI-840 Instruction Manual Section 3, Calibration Window. Note, however,

that factory recalibration may be required to meet full performance specifications of the LI-840.

LI-COR, inc. ●Environmental ● 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)

envsales@licor.com

www.licor.com HGA101

Source Detector

Disconnect ribbon

cable here.

Pre-formed Bev-a-line

tubing.

Unscrew nut(s) on inner air

port fitting(s) and remove

tubing.

Disconnect ribbon

cable here.

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