Automist Smartscan Hydra
®
DIOM Manual - version 3.01.0
Plumis Ltd Copyright © 2020. All Rights Reserved.
Page 29 of 116
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Figure 11: Drawing of the sprayhead height in relation to living room furniture
As you can see from the diagrams, the biggest potential obstruction to Automist is large wall mounted
furniture over 1350mm tall (see dotted lines above).
How Automist is affected by obstructions
When detecting the heat source to target with watermist, the infrared sensor on the sprayhead searches
for the point in the room where the temperature is increasing the fastest or a peak temperature beyond a
threshold. The sprayhead targets the hottest visible area, even if the view is partially obstructed because all
the heat accumulates on the ceiling emanating from the centre of the fire.
Figure 12: Interpretation of how the infrared sensor views the fire
Watermist uses a different principle of firefighting to traditional sprinklers, which suppress fires by wetting
surfaces and directly cooling the flames with large water drops. Watermist uses fine droplets, which
evaporate at the base of the fire, to extract heat and displace the oxygen fuel. This results in fire control,
suppression, or extinguishment depending on the fire type. Our sprayheads are wall-mounted to avoid
ineffective evaporation in the hot layer in the ceiling and the upward flow of hot combustion products. i.e.
