6700SR Refrigerated Sampler
74
Recharging the Desiccant
The 6700 samplers use a desiccant bag inside the controller case to
prevent moisture damage to its electronic components. Follow the
instructions in Opening the Controller Case to open the controller.
Remove the bag from the cardboard box at the front of the case
(
Figure
15
.)
How to Recharge the Desiccant
Do not put the cardboard box in the oven. You should recharge the
desiccant when the area marked “30” on the paper humidity indi-
cator turns pink.
Place a sheet of brown paper on a flat metal sheet. You can use a
brown grocery bag and a typical cookie sheet. Place only the bags
on the sheet. Do not stack the bags on top of each other or allow
them to touch. Place in a vented, circulating forced air, convection
oven in a well ventilated room. Allow two inches of air space be-
tween the top of the bags and the next metal tray above the bags.
Keep the tray a minimum of 16 inches from heating element. Heat
the bags at a temperature of 240° to 250°F (116° to 121°C) for 12 to
16 hours. At the end of the time period, the bags should be imme-
diately removed and placed in an air tight container for cooling.
The desiccant will be recharged to approximately 80 to 90% of its
previous capacity. After repeated recharging, the desiccant bag
may require replacement.
Some bags will have the temperature and time for recharging the
desiccant printed on the bag. If they differ, use the temperature
and time printed on the bag.
Keypad Connector
Module Connector
Liquid Detector
Connector
Pump Count
Connector
Connector Board
Connector
Battery
Figure 16 Main circuit board connections
Desiccant may produce
irritating fumes when heated.
Observe the following
precautions:
• Use a vented oven in a well
ventilated room.
• Do not remain in the room
while recharging is taking
place.
• Use the recommended
temperature.
There have been reports of
irritating fumes coming from
the desiccant during reacti-
vation. While our attempts to
duplicate the problem have
been unsuccessful, we still
urge you to use caution.
Material Safety Data Sheets
are provided in Appendix B.
CAUTION
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