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Teledyne API Model 200A NO
X
Analyzer Instruction Manual, 02246, Rev. G, DCN 5247
9.3.6 Ozone Generator
CAUTION - DANGER
Lethal voltages present inside Ozone Generator - DO NOT
defeat electrical interlock. Turn off instrument before
servicing. Unplug Generator before disassembling.
The ozone generator subsystem consists of a permeation drier, flowmeter, power supply -
generator module, and power switch. The location of the components is illustrated in Table 9-
9-18. Ozone is generated by drying ambient air, passing the air between two electrodes that have
a large oscillating electric field generated by a high voltage transf
ormer.
Common faults in the ozone generator are:
1.
A leak or some other failure in the drier will let ambient air into the generator. There is
enough water vapor in room air to cause the generator to make nitric acid aerosol. It is very
corrosive and causes the generator cartridge to short out due to salt build-up. This reduces
the ozone concentration generated which can cause the analyzer to be non-linear due to
insufficient ozone concentration.
2.
Blown fuse. The Ozone generator fuse is located on the upper end of the generator case.
3.
Contaminated ozone generator cartridge. Dis-assemble and clean. Salts and oxgenated
hydrocarbons can be removed by rinsing with 10% nitric acid at 50
C.
4.
Shorts, open circuits, arcing inside the case. Because of the very high voltages, metallic
components inside the ozone generator case can malfunction.
A.
Disconnect power.
B.
Remove ozone generator cover and inspect the wiring for evidence of arcing and open
circuits. Typically arcing due to high voltage has a dusty - burnt look. Look for these
areas inside the case and on the wiring that comes near the case.
9-54
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