Avon Protection
26 DAS775571AA Version 9, December 2015
GR 13313 CR121804
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Identification of Fire and Hotspots
The camera will represent zones of very high temperature as white or red within
the picture. When sufficient heat has been detected, e.g. a large area of fire, the
camera will automatically enter low sensitivity mode. This will extend the dynamic
range of the camera and allow the image of surrounding objects to remain clearly
visible.
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Hidden Fires
It is possible that fires may be burning or smouldering behind doors, in ducting or in
wall or floor cavities. In such circumstances, the operator should look for areas that
appear whiter when compared with the surroundings. Overhaul mode is particularly
useful in this situation, as it would colour the hottest areas red.
For example, a fire behind a door will cause the door to appear whiter against the
background. Similarly, a white area on an otherwise dark wall could indicate an area
of fire behind the masonry.
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Search for Persons and Objects
The camera is not restricted to locating fires. In many cases, the fire-fighter will be
using the camera to search for casualties, to seek out dangerous items such as fuel
tanks or gas cylinders and also as an aid to navigation through unknown premises.
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Image Clarity
The sharpness and clarity of the image provided is related to the temperature of the
scene and objects in view. A cold room provides little infrared energy and less detail
is detected than in a warm environment where objects give off significant energy.
In general, the warmer the scene, the more thermal contrast and hence the greater
detail in the picture.
