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TELEDYNE INSTRUMENTS
460L Instruction Manual Theory of Operation
05228 Rev B 57
DCN 5164 PRINTED DOCUMENTS ARE UNCONTROLLED
To provide a dry purge gas for the outer side of the Nafion
®
tube, the 460L returns the dried O
3
free air from the measurement cell and O
3
destruct to the outer tube (see Figure 10-4). When the
monitor is first started, the humidity gradient between the inner and outer tubes is not very large
and the dryer’s efficiency is low at first but improves as this cycle reduces the moisture in the
sample gas and settles at a minimum humidity.
10.2.3.3. Ozone Destruct Scrubber
The ozone destruct scrubber removes O
3
from the exhaust gas stream of the monitor after it exits
the instrument’s absorption tube but before it can damage the 460L’s flow meter and pump. It
also prevents hazardously high levels of O
3
from exiting the monitors exhaust outlet.
When installed, the O
3
scrubber is located outside the monitor’s NEMA housing, on the right side
at the top (see Figure 3-5). It is filled with a special catalytic ozone scrubbing material that
removes all of the O
3
from the sample gas exiting the sensor module’s absorption tube. The
catalyst used in the scrubber only converts ozone to oxygen and does not produce any toxic or
hazardous gases.
The catalyst is 100% efficient at scrubbing ozone at room temperature. It is a true catalytic
converter, therefore there are no maintenance requirements such as changing the scrubbing
material as is required for charcoal-based scrubbers.