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Model 400E Ozone Analyzer
Instruction Manual
9.3.7. Cleaning the Absorption Tube
1. Remove the cover from the optical bench.
2. Remove the #4 screws from the absorption tube retaining rings at both ends of
the absorption tube.
3. Using both hands, rotate the tube to free it, then carefully slide the tube towards
the back of the instrument (towards the lamp housing). The front of the tube
can now be slid past the detector block and out of the instrument.
4. Clean the tube with soapy water by running a swab from end-to-end. Rinse with
isopropyl alcohol, de-ionized or distilled water, then air dry. Check the cleaning
job by looking down the bore of the tube. It should be free from dirt and lint.
5. Inspect the o-rings that seal the ends of the optical tube (these o-rings may
stay seated in the manifolds when the tube is removed.) If there is any
noticeable damage to these o -rings, they should be replaced. See Appendix B of
this manual for the part number.
6. Re-assemble the tube into the lamp housing and leak check the instrument.
Note: It is important for proper optical alignment that the tube be pushed all the
way towards the rear (detector end) of the optical bench when it is re-
assembled.
P/N 04316 Rev: B
Do not cause the tube to bind against the metal housings. The
tube may break and cause serious injury.
MAINTENANCE SCHEDULE & PROCEDURES
CAUTION
215
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