Ive dealt a lot with fixed temperature and less in rate of rise, both in installation and inside a theatre. To me rate of rise should be fine as long as it is far enough from lighting fixtures, as they can pump out a lot of heat in a short period of time (going from cold to full on, and left on).
Aren't rate of rise typically 9ºC over one minute rise typically? And yes they are typically combination. (that is rate of rise also does fixed)
So 9ºC/60s (15ºF/60s) or 38ºC (100ºF) or 66ºC (150ºF) will set a rate of rise off.
Someone get out some temperature sensors and lets see how close to a source-4 750w we can get and not fill into that delta!!!
As is I've changed a lot of detectors out for the 150ºF versions after the 100ºF ones have gone off as a nuisance (usually in a kitchen or such). Sucks when its not the middle of summer as it's not going to go off as quick or such, but a hot kitchen with no A/C in the middle of the summer when it's already 30+ degrees out (Celsius that is) it becomes necessary. Deep Friers, Grills, Ovens, Stoves, and such packed into kitchens put out a hell of a lot of heat.
If you look at the spec sheets:The ones we have are 15ºF over 1 minute OR 135ºF, whichever comes first. In truth you have to wail on thing with a heat gun pretty hard before it trips.
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