This is taken directly from one of the ATIK manuals and I believe this is what you are referring to...
"Your camera includes a high-performance molecular sieve desiccant tablet
which is used to avoid condensation in the CCD chamber. Although this
desiccant will last a long time it may eventually need replacement or
recharging, in which case please follow the instructions below:
- To replace the desiccant, open the desiccant port with the supplied
plastic interface and a screwdriver, take out the used tablet and replace
it with a fresh one. Replace the port cover and tighten (no need to overtighten).
Wait 24 hours before connecting the camera again.
- To recharge the desiccant, place the tablet in an electric oven at 200ºC
for a couple of hours. Take it from the oven, wait a few minutes for it to
cool down slightly, then put it back in the camera and wait 24 hours.
You will notice that there is a filter inside the desiccant chamber. The purpose
of this is to avoid contamination of the chamber when the desiccant is being
replaced. The filter is very fragile and should not be touched."