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Teledyne API Model 200AU NO
X
Analyzer Instruction Manual, 02293, Rev. F
4-8
Table 4-2: Ozone Generator Start-up Timing
Time Since Last
Power-up
Ozone Gen State Program Action
< 1 hour ON at power-up Gen ON immediately after power-up.
> 1 hour OFF at power-up Wait 30 min, then turn gen ON.
4.2.9 Molybdenum Converter – Ozone Scrubber
The molybdenum converter is a stainless steel cartridge containing molybdenum chips heated to
315
°
C. The converter's function is to reduce NO
x
to nitric oxide NO. The temperature control
for this module is done by the Switch Card in the Power Supply Module using commands
generated by the CPU. The temperature is measured by a type J thermocouple and is conditioned
on the Status/Temp board. The analog voltage representing the Moly temperature is read by the
V/F board and sent to the CPU where signals are generated for temperature control. The
digitized voltage is translated to degrees for the TEST function on the front panel and for
warnings.
The molybdenum converter assembly also contains a catalytic ozone scrubber that removes
excess ozone from the instrument exhaust.