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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
9-53
Table 9-11: Ozone Generator Control Conditions
Condition Description
Ozone
Generator
1
Manual override off (SETUP-MORE-DIAG-OZONE GEN).
OFF
2 Manual override on. ON
3 Ozone flow below low warning limit for 5 minutes (OFLOW_SET
setup variable, typically <40 cc/min).
OFF
4 Instrument powered on for more than 30 minutes. ON
5 Instrument powered off for less than 1 hour and ozone generator was
on when instrument was powered off.
ON
6 Ozone flow above low warning limit for 0.5 minutes and condition 4
or 5 is true.
ON
NOTE
The ozone generator is independently controlled in the SIGNAL I/O, OPTIC
TEST, and ELECTRICAL TEST diagnostics. After exiting these diagnostics,
the ozone generator is restored to the state specified by the above conditions.
9.3.6.1 PermaPure Drier
The PermaPure drier is constructed of 2 concentric tubes. The inner tube is a special material
that has an affinity for water vapor. The outer annulus is evacuated by the instrument pump. This
creates a concentration gradient causing water in ambient air to diffuse into the outer annulus,
thus the air in the inner tube becomes progressively drier as it progresses down the tube.
Due to the large number of connections and fittings on the drier, the most common drier fault is
leaks. Before proceding with any other procedures check the drier for leaks.
Occasionally the drier gets contaminated. The manufacturer of the drier recommends replacing
the drier rather than trying to clean it. If cleaning is chosen, the following options are available:
1. Dirt - Clean any solids from dryer inlet by brushing. Use clean dry air to blow any loose
particles from the inlet. Deionized water or dilute(5-10% conc HCl in deionized water)
hydrochloric acid can be passed through the dryer. This should be done only with the dryer
and HCl at room temperature.
2. Organic liquids and freons - Rinse the inner and outer tubes using 1,1,1 trichlorethane.
Follow the solvent with dry air to purge the solvent.
3. Inorganic salts and oxgenated hydrocarbons can be removed by rinsing with 10% nitric
acid at 50
°
C.