QSI 520c Guía de usuario descargar pdf (Pagina 80)

QSI 500 SERIES USER GUIDE

Recharging the desiccant

The environmental chamber enclosing the CCD is filled with UHP argon during

manufacturing to increase cooling capability and prevent the formation of frost on the CCD

cover glass. This ultra dry and clean noble gas will generally remain in the environmental

chamber for about 3 years.

Warning: Depending on specific use patterns and environmental conditions

around the camera, it is possible that moisture could build up in the chamber in

less than 3 years. Proper maintenance of the environmental chamber is critical to

the operation of the camera. If water vapor or ice forms inside the environmental

chamber when cooling below the dew point, it is critical that the camera be turned

off immediately and the instructions below followed to restore the camera to

proper operating condition.

You can restore many of the benefits of the original UHP argon by recharging the

microsieve desiccant in the desiccant chamber. The desiccant removes the moisture

present in the environmental chamber and stores it behind a submicron gas permeable

membrane. Over time the desiccant will lose its ability to remove additional moisture and

you may begin to see frost or dew forming on the CCD cover glass when operating the

CCD at low temperatures or in high humidity environments.

To recharge the desiccant, unplug the camera and allow sufficient time for the CCD to

reach room temperature. Place the camera, with the desiccant chamber cover upright, on a

stable surface. Loosen the four screws holding the desiccant cover and lift it from the

camera.

Lift the brass desiccant canister from

the camera. Preheat an oven to 500

degrees Fahrenheit. Place the

desiccant canister in the 500°F oven

for 4 to 5 hours. This will drive out the

accumulated water molecules,

recharging the desiccant.

Remove the desiccant canister from

the oven and let it cool. As soon as

the canister leaves the oven it will

begin absorbing moisture. To

minimize the impact on the

effectiveness of the desiccant, the

canister should be returned to the

camera as soon as it has cooled to

nearly room temperature. Place it

back in the desiccant chamber with

the fine grid face down toward the inside of the camera. Screw the nameplate back down

to the camera making sure that the O-ring surrounding the nameplate is carefully seated

against inside of the environmental chamber.

1 2 ... 75 76 77 78 79 80 81 82 83 84 85 86 87

Comentarios a estos manuales

Sin comentarios

QSI 520c Guía de usuario Pagina 80

Comentarios a estos manuales

Relacionado con productos y manuales para Cámaras De Seguridad QSI 520c