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OPERATION
Teledyne API Model 701 Zero Air Generator
5-10 01671H (DCN6051)
5.14 CO Scrubber (option)
The CO scrubber catalytically oxidizes CO to CO
2
. The catalyst is proprietary and
operates at room temperature; however, it is heated to approximately 70C to prevent
water condensation. It theoretically should never need changing. However, it may
become contaminated or poisoned over time so we recommend that it be replaced once
per year or sooner if the level of CO in the air is high.
5.15 NO Scrubber
The NO scrubber uses Purafil® to oxidize NO to NO
2
. Purafil® has a finite life and we
recommend that it be replaced annually or sooner if the level of NO in the air is high.
5.16 Charcoal Scrubber
Activated charcoal removes NO
2
, O
3
, SO
2
and H
2
S. The charcoal should be replaced
annually or sooner if there are high atmospheric levels of these contaminants, or if the
calibrator zero air shows signs of a positive drift.
5.17 Final Filter
The final filter, inside the rear panel retains any particulates released by the M701. The
filter rating is 10 microns. If the filter should become restricted, it should be
disassembled and cleaned, or the element replaced.
5.18 Controller
CAUTION
Dangerous voltages exist on the controller board even when the
power switch is turned off.
All functions of the M701 are managed by the M701 Control PCA. The M701 Control
PCA provides connections for all switched and non-switched AC components, AC input,
and the front panel power switch/circuit breaker. Non-switched components include the
CO or HC scrubber, fan and front panel power indicator. Switched components include
the Regenerative Dryer valve, water drain valve, and the pump. All connections are
made by quick release electrical connectors to aid in servicing. See schematics in
Appendix B.