What is an optical detector field of view?
All flame detectors have 90 up to 120 degree cone of vision. One can assume that the wider the cone of vision the more area the detector can cover. However this is both misleading and in many cases totally incorrect!! In the case of the IR3 detector which has a 90 degree cone of vision but can see a 1x1sq.ft (0.1 m3) fire at a distance of 200 feet (60 m) – the area the detector can cover is far greater (six times) than that of a detector with a 120 degree cone of vision!!
