QHYCCD QHY8L - Manual (Page 8)

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You should shut off all power after you are
finished using your CCD. If the camera is still on
(via USB), any ice crystals around CCD chip will
melt which can corrupt or short-circuit the PCB
board.
Notes about Long term use camera and
Remote Observatory
If you have to keep the camera working for a long time
or the camera is working in a remote observatory,
please follow the following procedures, and we
recommend that you consult your area dealer for
more details.
1. Before using the camera, always check that the
CCD chamber is sealed and dry. If there is a lot ice
crystals around the chip-this indicates a high relative
humidity in the CCD chamber. You must dry the CCD
chamber.
2. Check the air tightness of CCD sealed chamber.
You can check this by increasing the internal pressure
of the CCD sealed chamber with a hand pump(do not
exceed 1.01MP). Then watch if the pressure drops. If
the pressure drops quickly, this indicates a lack of air
tightness. You need to check if the front cover is
screwed on well.
3. Put effective desiccant in the dry tube and connect
continually with CCD for a long term drying.
4. Don’t supply power to the CCD for several days or
even weeks if possible. Use a power controller to
control 12V input or AC input.