Teledyne API M751H High Performance Zero Air Generator Operation
07773A DCN6833 25
4.2.11 NO-NO2 Scrubber The NO scrubber uses Purafil ® to oxidize NO to NO2. Puraf il® 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 NO2, O3, SO2 and H2S. The charcoal should be replaced
annually or sooner if there are h igh 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 CO2. The catalyst is proprietary and
operates at room temperature; theoretically, it should never need cha nging. 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 usua lly indicate 30 psig. If the flow dema nd from the calibrator changes,
the regulator needs to be adjusted to display th e correct pressure on the gauge. It is
normal for the gauge needle to not rest at zero when the system is not u nder
pressure.
4.2.16 Controller WARNING
DANGEROUS VOLTAGES EXIST ON THE CONTROLLER BOARD.
All functio ns of the 751H are managed by th e 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.