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By N Cole from Granbury, TX
By
11/30/2009
As foxrun41 said, smoke detectors detect smoke. There are 2 kinds, photoelectric and ionization. One detects smaller particles from fast burning fires and the other is better with larger particles from smoldering fires. The detectors can be set off if something blocks the sensor such as excess dirt or dust or small insects such as spiders.
By
11/30/2009
It's not the smell that sets off a smoke detector but the smoke. All smoke detectors consist of two basic parts: a sensor to sense the smoke and a very loud electronic horn to wake people up. Smoke detectors can run off of a 9-volt battery or 120-volt house current.
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