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Astrel Instruments

AST-8300-A

Using the vacuum pump

The AST8300 camera adopts a low vacuum approach to avoid frosting on the CCD glass, filters

and optical window. Using the included vacuum pump, you can remove the air from inside the

camera, so that there's no more water vapor to freeze on the CCD glass and filters. Moreover,

reducing the air inside the camera minimizes the heat exchanges due to convection, so the

optical window never get too cold due to the low CCD and cold finger temperature. The included

pump is typically able to reach about 25 inHg vacuum in less than a minute of operation, but

anything above 23 inHg is enough. The vacuum pump gauges have a tolerance of about +/- 1

inHg, refer to the "Important Notice" sheet provided with the camera to get the proper vacuum

level to be set before cooling the camera. The camera is tested to maintain a vacuum better

than 23 inHg for at least two days and it's not unusual for cameras to last for weeks, so there's

no need to operate the pump during a photo session.

Always keep the vacuum valve closed even when the camera is not working. When the camera

is not used for long periods, it is advisable to put it into an air tight envelop.

WARNING: never get the camera below the freezing temperature without evacuating it to an

acceptable vacuum level: you will run the risk of frost creation on the CCD glass and even

produce a permanent damage to the camera.

Getting Started

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