QHYCCD QHY8L - Manual (Page 7)

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3. Screw silica gel tube into the connection of the
sealed chamber. Make sure the rubber O-Ring
is present to ensure an airtight connection.
4. In about 24 hours, the proper relative humidity
should be restored in the CCD sealed
chamber
If you need to dry the chamber faster, you can use
the following method:
Using compressed air or a hand pump with dry air,
make dry air go through the silicon gel tube.
Meanwhile, slightly unscrew the front cover of
CCD. The air current will flow over the CCD
sealed chamber through the air connection of the
CCD. Then air will flow out from the gap between
the unscrewed front cover of CCD and the body of
CCD. After a few minutes, the relative humidity in
the CCD sealed chamber will get lower. Please
note, too high of a pressure can damage the CCD
chip and the cooling system.
Dew is formed on the IR cut glass
If the cooling temperature is too low in a high
humidity environment, the CCD optic window may
collect dew. This is because the temperature of
the window is too low.
The QHY8L uses 3mm thick optic glass. Although
this glass should prevent dew, follow this
procedure if you run into problems:
1. Install M42 to M42 heater produced by QHYCCD,
The heater will raise the temperature to avoid dew
forming. Consult your area dealer to purchase.
2. Reduce the cooling power. The best
temperature range for QHY8L is from -15℃ to -
20℃. Please adjust cooling temperature according
to the ambient temperature.
3. Don’t put the glass window of the CCD upside
down. Cold air will focus on the optic windows if it
is upside down. It will cause lower temperature of
optic windows.