Cleaning Or Replacing The Absorption Tube - Teledyne T750 User Manual

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7.5.
LEANING OR
Note
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.
6. Clean the tube with Distilled or de-ionized water by running a swab from end-
7. Air-dry the tube.
8. Check the cleaning job by looking down the bore of the tube.
9. Inspect the o-rings that seal the ends of the optical tube (these o-rings may
10. Re-assemble the tube into the lamp housing and perform a leak check
Note
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A
EPLACING THE BSORPTION
Although this procedure should never be needed as long as
the user is careful only to supply the photometer with clean,
dry and particulate free zero air, it is included here for those
rare occasions when cleaning or replacing the absorption
tube may be required.
• The front of the tube can now be slid past the detector block and out of
the instrument.
CAUTION – Avoid Damage to the Instrument
Do not cause or allow the tube to bind against the metal housings.
The tube may break and cause serious injury.
to-end.
• It should be free from dirt and lint.
stay seated in the manifolds when the tube is removed.)
If there is any noticeable damage to these o-rings, they should be
•
replaced.
(Section 7.4) on the instrument.
For correct optical alignment, ensure that the tube is pushed
all the way to the front of the optical bench when it is
reassembled prior to gently retightening the tube retainer
screws, so that the tube is snug against the stop inside the
detector manifold
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083730750B DCN8606