Avon Protection
27 DAS775571AA Version 9, December 2015
GR 13313 CR121804
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Heat Layers in Closed Spaces
In a major fire, a layer of hot gases may build up in the upper region of the closed
space. Attempting to use the camera in this hot layer will cause the image to
become featureless. By bringing the camera down beneath this layer, the unit is
able to provide the fire-fighter with a clearer picture of the scene ahead.
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Windows and Polished Surfaces
Glass is not transparent to long wavelength infrared energy and it is not possible for
the operator to use the camera to look through a window. A white window would
indicate that the window itself is relatively warm and may be being heated by a fire
behind it. Just as we see reflections in glass under normal circumstances, it is
possible that the camera can detect infrared reflections in glass, mirrors and
polished or painted surfaces. Care must be taken to ensure that the image seen is
not simply a reflection. Experience will give the operator added confidence.
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Control of Water Streams/Jets
When viewed through the camera, water streams from hose reels will appear black
against the background scene. The control and direction of a water flow can be
monitored by viewing its flow and effect on the fire through the camera. It may be
necessary, if employing a water wall, to drop the wall momentarily to view the
effects of the extinguishing stream.
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Smoke Types
The camera will provide vision through all types of smoke and steam.
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Lens Cleaning During Operation
The camera lens, like the BA visor, may become obscured during use. The lens may
be cleaned with a glove or cloth if necessary.
