2006-09-17 04:31:31 · 10 answers · asked by Shiva 1 in Home & Garden ➔ Other - Home & Garden
well fire alarm and those sprinklers on the ceiling work by having a little ball in them and when their is a fire it melts and causes a reaction in the object and it becomes activated. any other one just works by detecting the heat your body is giving off, different levels of heat show different colors or sensories.
2006-09-17 04:38:20 · answer #1 · answered by Tommy 1 · 1⤊ 0⤋
Some heat sensors are made from dissimilar metal wires fused together at the ends. When exposed to heat a small current is generated in the metals and this can be used to power a meter to show temperature or amplified to turn on or off a switch. These are called thermocouples and are quite an ancient method. There are now solid state micro chips that do similar functions by being temperature sensitive.
2006-09-17 11:44:31 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Just like light sensors work, but heat sensors do it in the infra-red range instead of the visible range of the spectrum.
2006-09-20 07:50:09 · answer #3 · answered by Omar Z 2 · 0⤊ 0⤋
Some of the old ones worked on bi-metallic strips (one metal expands more than the other as the temperature rises and triggers a switch) but I am sure they are more sophisticated now.
2006-09-17 11:42:29 · answer #4 · answered by ? 5 · 0⤊ 0⤋
One way is a bi-metal strip - 2 different metals that expand at different rates when heated
2006-09-17 11:40:56 · answer #5 · answered by Doddie 1 · 0⤊ 0⤋
Resistance circuit, changes with heat
2006-09-17 11:40:14 · answer #6 · answered by mkaamsel 4 · 0⤊ 0⤋
They sense heat
2006-09-17 11:39:13 · answer #7 · answered by limgrn_maria 4 · 0⤊ 0⤋
Thermistors
2006-09-17 13:15:50 · answer #8 · answered by Swoosh 2 · 0⤊ 0⤋
detect heat at set pemporature, to turn it off or on.
2006-09-18 02:55:25 · answer #9 · answered by Anonymous · 0⤊ 0⤋
they detect heat and will go off at a certain tempreture,depends on what kind you have
2006-09-17 11:34:18 · answer #10 · answered by ? 3 · 0⤊ 0⤋