Fire detector

Sunlight-blind flame sensors are usually UV detectors. Google "uv flame detector"

John

Our church auditorium (50 x 85, with tall sloped ceilings) use this beam & reflector combination. Technically, I think that detectors smoke, not fire, but just thought I would mention it.

I suppose it is infrared, since you cannot see a beam, even with the auditorium is dark.

Maybe a call to ADI would help?

You said "fire"... a microswitch held open by a fulminating cotton restraint. Old, reliable.

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A fire sprinkler head? It not only detects, but if you have water handy, it DOES something about it. Water-operated alarms (and latches, so the alarm continues until reset) are commonly used in buildings with sprinkler systems.

Thanks for your answer...

@John Larkin

UV flame detectors are perhaps the best solution but:

1. aren't cheap (each sensor costs at least 13$, and i don't consider UVtron or something similar...)
2. haven't a wide viewing angle

@Jitt

Any link?

@mpm and with3rd These aren't useful solution for my project...I want to implement a system that detecs fire in a small OPEN ambient with some trees...What do you think about temperature sensor?Could be a good solution? Thanks

It could work, but you need to think through the maximum ambient temperature range. Perhaps a temperature rate device?

He just means a cotton thread streched across the potential flame area, that when it burns, it release the switch lever to close. Wildlife might be a challenge with something like this. =3D:-O

Something like those UV-activated yard light thingies, with a set point at. say, 451F? ;-)

Good Luck! Rich