Teledyne API T703/T703U Calibrator Operation Manual Maintenance Schedule & Procedures
147
7.3. CLEANING OR REPLACING THE ABSORPTION TUBE
NOTE:
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.
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 with Distilled or de-ionized water by running a swab from end-
to-end.
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.)
If there is any noticeable damage to these o-rings, they should be
replaced.
10. 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 re-assembled.
This will ensure that the tube is assembled with the forward end against the stop inside the
detector manifold.
7.4. REBUILDING THE DRY AIR PUMP
The diaphragm in the sample pump will periodically wear out and require
replacement. A sample rebuild kit is available. See Appendix B of this manual
for the part number of the pump rebuild kit. Instructions and diagrams are
included with the kit.
Always perform a Flow and Leak Check after rebuilding the Sample Pump.
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