Astrel Instruments AST492 Початок роботи - Сторінка 8

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Astrel Instruments

AST492

Using the vacuum pump

The camera adopts a low vacuum approach to avoid frosting on the CMOS glass. Using the

included vacuum pump, you can remove the air from inside the camera, so that there's no more

water vapor to freeze. 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 CMOS

temperature. The included pump is typically able to reach about

25-26 inHg

vacuum in less

than a minute of operation, but anything above 24 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 24 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 CMOS glass and even

produce a permanent damage to the camera.

Getting Started

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