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Teledyne API – Model T700 Dynamic Dilution Calibrator Maintenance
231
8.2.2. 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. Remove the center cover from the optical bench.
2. Unclip the sample thermistor from the tube.
3. Loosen the two screws on the round tube retainers at either end of the tube.
4. Using both hands, carefully rotate the tube to free it.
5. 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
DO NOT CAUSE THE TUBE TO BIND AGAINST THE METAL HOUSINGS.
THE TUBE MAY BREAK AND CAUSE SERIOUS INJURY.
6. Clean the tube by rinsing with de-ionized water.
7. Air dry the tube.
8. Check the cleaning job by looking down the bore of the tube.
It should be free from dirt and lint.
9. 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).
10. If there is any noticeable damage to these o-rings, they should be replaced.
11. Re-assemble the tube into the lamp housing and perform an Auto Leak Check on
the instrument.
Note
It is important for proper optical alignment that the tube be pushed all the way
towards the front of the optical bench when it is reassembled prior to gently
retightening the tube retainer screws. This will ensure that the tube is
assembled with the forward end against the stop inside the detector manifold.
06873B DCN6388