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8. Changing desiccant cartridge and/or battery.
In order to change desiccant cartridge and/or battery, remove the two thumb screws on the
rear cover. These screws are approximately seven inches long and after they are loose
must be pulled out. If the instrument has a filter bracket installed the screws holding the
bracket to the bottom cover must also be removed. Then the bottom cover may be
removed.
.
•
The desiccant cartridge may be replaced by unscrewing it and pulling it out.
The sensor must be in the sample chamber, this position is reached by pulling out the
sensor actuator. The replacement cartridge is in a sealed tin container. Open the container
and remove the replacement desiccant cartridge. Remove the GREEN cap,
DO NOT
open
the RED cap as the desiccant will spill out. Screw in the replacement desiccant cartridge
making sure that the same seals are in place as when you removed the old cartridge, such
as the PTFE washer and Viton ‘O’ ring. Tighten the desiccant cartridge securely into place.
Move the sensor actuator back and forth to make sure that the sensor moves in and out of
the desiccant smoothly.
.
Bottom view of the XPDM with cover open.
The sample chamber and desiccant cartridge
are shown cut open to facilitate an
understanding of the mechanism and how it
is assembled.
