Filter
Top Products
M400E Ozone Analyzer Operator’s Manual Maintenance Schedule & Procedures
12.3.6. MAINTENANCE OF THE PHOTOMETER ABSORPTION TUBE
12.3.6.1. 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. Make sure the analyzer is warmed-up and has been running for at least 15 minutes before proceeding.
2. Remove the center cover from analyzer the optical bench
3. Locate the optical bench (see Figure 3-4).
4.
Remove the top cover of the optical bench.
5. Unclip the sample thermistor from the tube.
6. Loosen the two screws on the round tube retainers at either end of the tube.
7. Using both hands, carefully rotate the tube to free it.
8. 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.
9. Clean the tube with soapy water by running a swab from end-to-end. Rinse with isopropyl alcohol then
de-ionized water
10. Air dry the tube.
11. Check the cleaning job by looking down the bore of the tube.
It should be free from dirt and lint.
12. 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.
13. 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.
04315 Rev. C1 227