Campbell Scientific CC5MPX and CC5MPXWD Digital Network Cameras - Manual (Page 127)

B-1
Appendix B. CC5MPXWD Window
Defroster Description
The window defroster consists of an aluminum ring with a resistive type
heating element (see Figure B-1 CC5MPXWD Window Defroster). The
camera can be programmed to turn on the power to the heater based on the
internal temperature reading of the camera. The on duration can also be set on
the camera.
The heating element is nominally 18 Ohms in resistance. The current draw
will vary with the allowable input voltage range of 9 to 16 VDC. The current
draw from the camera and heater combined is 1.2 A maximum at 16 Vdc and is
typically 1.0 A on a nominal 12 Vdc system.
Operating the CC5MPXWD at voltages greater than 16
Vdc may damage the camera.
The window defroster is useful in preventing and removing light frost and icing
from the camera window. With extreme icing or riming conditions and low
temperatures the window defroster may not be able to clear the window due to
the power constraints of the defroster.
Springs are used to press the window defroster against the window. It is normal
for the window defroster to leave marks on the window. These marks are
outside of the camera’s viewing angle (see Figure B-2 Window Defroster with
Lens Tube).
FIGURE B-1. CC5MPXWD Window Defroster
CAUTION