Section 5. Maintenance
Cleaning the optical bench
The optical bench can be removed and cleaned if necessary. If, for example, you are
unable to set the span, the optics may be contaminated. Generally speaking, don't
undertake this procedure unless you've ruled out other potential problems. You'll
have to set the instrument zero and span after reassembling the optical bench.
1
Turn off the instrument.
Unplug the power cable.
2
Remove the top cover.
It is attached with 6 captive screws. Loosen each of the screws until the top cover is
free of the bottom. If your instrument has a display, carefully rotate the top cover
out of the way without straining the cable, and then unplug the display cable. Set
the cover aside, being careful not to strain the ribbon cable.
3
Remove the cables from the source and detector.
Gently grasp the plug and pull it free of the assembly. Leave the tubes in place.
4
Carefully lift the optical bench out of the foam.
5
Remove the screws that secure the source and detector (4 each), then separate the source and
detector housings (with circuit boards attached) from the optical path.
5-4 Using the LI-830 and LI-850 Gas Analyzers
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