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Model 9110T NOx Analyzer Troubleshooting & Service
Teledyne Analytical Instruments 304
12.7.15. O
3
GENERATOR
The ozone generator can fail in two ways, electronically (printed circuit board) and functionally (internal
generator components). Assuming that air is supplied properly to the generator, the generator should
automatically turn on 30 minutes after the instrument is powered up or if the instrument is still warm.
See Section 13.2.3 for ozone generator functionality. Accurate performance of the generator can only be
determined with an ozone analyzer connected to the outlet of the generator. However, if the generator
appears to be working properly but the sensitivity or calibration of the instrument is reduced, suspect a
leak in the ozone generator supply air.
A leak in the dryer or between the dryer and the generator can cause moist, ambient air to leak into the
air stream, which significantly reduces the ozone output. The generator will produce only about half of
the nominal O
3
concentration when run with moist, ambient air instead of dried air. In addition, moist
supply air will produce large amounts of nitric acid in the generator, which can cause analyzer
components downstream of the generator to deteriorate and/or causes significant deposit of nitrate
deposits on the reaction cell window, reducing sensitivity and causing performance drift. Carry out a
leak check as described earlier in this Section.
12.7.15.1. O
3
Generator Override
This feature allows the user to manually turn the ozone generator off and on. This should be done before
disconnecting the generator, to prevent ozone from leaking out, or after a system restart if the user does
not want to wait for 30 minutes during warm-up time. To access this feature press the following buttons:
(Also note that the ozone generator does not turn on if the ozone flow conditions are out of specification
(e.g., if there is no flow through the system or the pump is broken).