
Setup and Operation
2–5
Figure 2-3
Inside View of the CNC; a Purge-Air Inlet and Filter
The purge inlet tube has a porous plastic filter on one end. Remove the filter and
insert a plug. Be sure that the drain connector from the bottle is attached to the
mating connector on the CNC; it functions as an air escape. Very carefully
introduce slight pressure into the instrument with a clean (filtered), dry,
compressed-air source. The pressure forces the liquid out of the saturator block
and out through the drain. With about 5 psig of air pressure, the saturator will dry
out in a few hours. Vent the air from the drain tube into a hood or other ventilator.
You can also dry the saturator block by draining the liquid and then drawing dry
air through the instrument with the vacuum source for 24 to 48 hours.
If you plan to leave the CNC power
off
for more than two days, drain the alcohol
from the CNC. It is not necessary to dry the alcohol from the saturator block
unless you are shipping the instrument. Moreover, moving the instrument from
room to room does not require the CNC to be drained, provided you keep it
upright during the process.
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