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T400 Ozone Analyzer Operator’s Manual Instrument Maintenance
235
11.3.7. MAINTENANCE OF THE PHOTOMETER ABSORPTION TUBE
11.3.7.1. Cleaning or Replacing the Absorption Tube
Note Although this procedure should never be needed as long as the user is
careful to supply the photometer with clean, dry and particulate-free zero
air only, it is included here for those rare occasions when cleaning or
replacing the absorption tube may be required.
1. Power off the unit.
2. Remove the center cover from analyzer the optical bench
3. Locate the optical bench (see Figure 3-5).
4. Remove the t
op cover of the optical bench.
1. Unclip the sample thermistor from the tube.
2. Loosen the two screws on the round tube retainers at either end of the tube.
3. Using both hands, carefully rotate the tube to free it.
4. Slide the tube towards the lamp housing.
The front of the tube can now be slid past the detector block and out of the
instrument.
CAUTION
General Safety Hazard
Do not cause the tube to bind against the metal housings.
The tube may break and cause serious injury.
5. Clean the tube only with de-ionized water.
6. Air dry the tube.
7. Check the cleaning job by looking down the bore of the tube.
It should be free from dirt and lint.
8. 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.
9. Re-assemble the tube into the lamp housing and perform an AUTO LEAK CHECK
on the instrument.
Note Before re-tightening the retainer screws, gently push the tube all the way
towards the front of the optical bench when it is re-assembled. This will
ensure that the tube is assembled with the forward end against the stop
inside the detector manifold.
06870C DCN6332