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2101 Field Wizard
Section 5 Maintenance
5.3 Desiccant
5.3.1 Replacing the
Desiccant: 2101
Collar
Cartridge
5.3.2 Reactivating the
Desiccant
Silica gel
5-2
The Field Wizard uses desiccant to protect the internal compo-
nents from moisture damage. The cartridge is filled with indi-
cating silica gel that is blue or yellow when dry. As the desiccant
becomes saturated, the color changes from blue to pink, or from
yellow to green. Replace the desiccant before the entire length of
the cartridge turns pink or green.
The desiccant is contained in a cartridge located on the left side
of the Field Wizard. To remove the cartridge, unscrew the collar
and slide the cartridge out of the Field Wizard. The clear tube
reveals the silica gel desiccant inside.
To replace the silica gel desiccant:
1. Hold the cartridge upright with the collar at the top.
2. As shown in the margin, push the collar off the cartridge.
3. Empty the saturated silica gel beads or granules.
4. Fill the tube with new (Isco P/N 099-0011-03) or reacti-
vated (see section 4.3.2) silica gel desiccant.
5. Press the collar onto the tube.
6. Slide the cartridge into the Field Wizard. Tighten the col-
lar to seal the cartridge in place.
Silica gel beads and granules of desiccant can be reactivated.
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 the regeneration is taking
place.
• Use the recommended temperature. Avoid heating the
desiccant at higher than recommended temperatures.
There have been reports of irritating fumes coming from the des-
iccant during reactivation. While our attempts to duplicate the
problem have been unsuccessful, we still urge you to use caution.
Material Safety Data Sheets are in the back of this manual.
The desiccant's ability to remove moisture may lessen with each
saturation/reactivation cycle, resulting in a need for more fre-
quent service. After several cycles, the desiccant may no longer
be effective as it saturates too quickly. At this point, replace the
desiccant.
To reactivate the silica gel desiccant, pour the spent desiccant
into a heat resistant container. Never heat the cartridge
assembly; it will melt. Heat the silica gel in a vented convection
CAUTION
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