Argus 3 User Manual page 11

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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.
 e2v technologies (uk) limited 2014
118707 P7030UM version 6, page 11