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R
OUTINE
S
ERVICING
748250-L Rosemount Analytical October 1999
6-3
Model 880A Non-Dispersive Infrared Analyzer
Detector
Assembly
(See Figure 6-3)
B. SHORT CELLS
O-Rings
Cells
Sample In
End Cap/Optical Filter
Assembly
End Cap
Assembly
Support Brackets
(Shown in phantom for clarity)
Motor/Source Assembly
(See Figure 6-2)
Desiccant
Holders
A. LONG CELLS
Sample In/Out
(interchangeable)
End Cap/Optical Filters
Assembly
Plate
Assembly
Motor/Source Assembly
(See Figure 6-2)
Desiccant
Holder
Cell Assembly
O-Rings
O-Rings
Compression
Gaskets
Detector
Cover
Oscillator
Tune Adjust
Detector
Cover
Oscillator
Tune Adjust
Sample Out
Detector Cover
removed for clarity
Detector Cover
removed for clarity
Motor/Source Assembly
to Optical Bench Plate
mounting screws
Optical Bench Plate
End Cap/Filter Assembly,
Sample Cell to Detector
mounting screws
Motor/Source Assembly
to Optical Bench Plate
mounting screws
Optical Bench Plate
Detector
Assembly
(See Figure 6-3)
seat properly. Move the motor/source assembly back into position. Verify that the
compression gaskets seat properly.
11. Replace the two screws which hold the motor/source assembly to the optical bench
plate. Do not overtighten.
12. Install the sample lines.
13. Check for leaks as instructed in Section 2.8. Take corrective action if necessary.
14. Replace desiccant if required (see Section 6.2).
15. Perform source balance and source alignment adjustments per Sections 5.6 and
5.7.
F
IGURE
6-1. C
ELL
R
EPLACEMENT
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