COSA Xentaur Xentaur XPDM - Manual (Page 18)

page 15
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 hold-
ing the bracket to the bottom cover must also be removed. Then the bottom cover may be
removed.
•
The battery may be replaced with another 9V battery (we recommend lithium) by sim-
ply pulling it out of its holder.
• The desiccant cartridge may be replaced by unscrewing it and pulling it out. The sen-
sor 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 car-
tridge securely into place. Move the sensor actuator back and forth to make sure that
the sensor moves in and out of the desiccant smoothly.
Spring energized
PTFE “O” ring
PTFE washers
Viton
“O” ring
Sample
chamber
Desiccant
cartridge
100µ SS wire mesh filter
Bottom of VCO fitting, “O” ring visible
Bottom view of XPDM with cover open.
The sample chamber and desiccant car-
tridge are shown cut open to facilitate an
understanding of the mechanism and how it
is assembled.
Sensor