Teledyne API M751H High Performance Zero Air Generator
Operation
07773B DCN6940
25
4.2.11 NO-NO
2
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.
4.2.12 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.
4.2.13 Carbon Monoxide (CO) Scrubber
The CO scrubber catalytically oxidizes CO to CO
2
. The catalyst is proprietary and
operates at room temperature; theoretically, it should never need changing. However,
in the event it were to become contaminated or poisoned, we recommend that the
scrubber be replaced.
4.2.14 Final Filter
The final filter, located adjacent to the instrument panel, retains any particulates
released by the 751H. The filter rating is 99.99% removal of 0.1 micron particles. If
the filter becomes restricted, it should be replaced.
4.2.15 Pressure Gauge
The pressure gauge shows the regulated air pressure available to a calibrator. The
gauge will usually indicate 30 psig. If the flow demand from the calibrator changes,
the regulator needs to be adjusted to display the correct pressure on the gauge. It is
normal for the gauge needle to not rest at zero when the system is not under
pressure.
4.2.16 Controller
WARNING
DANGEROUS VOLTAGES EXIST ON THE CONTROLLER BOARD.
All functions of the 751H are managed by the Control board (Figure 4-4), which
provides connections for all switched and non-switched AC components, AC input,
and the instrument panel power switch/circuit breaker.
•
Switched
components include the regenerative dryer valve, the water drain
valve, and the relief valve.
•
Non-switched
components include the HC scrubber, the fan, the LED board
and the pump.
Summary of Contents for 751H
Page 2: ......
Page 4: ...ii 07773B DCN6940 This page intentionally left blank...
Page 44: ...A 2 07773B DCN6940 This page intentionally left blank...
Page 46: ...This page intentionally left blank A 4 07773B DCN6940...
Page 47: ...07773B DCN6940 B 1 APPENDIX B SCHEMATICS...
Page 48: ...B 2 07773B DCN6940 This page intentionally left blank...
