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Photoelectric and ionization are two types of what?
Flame Detectors
Heat Detectors
Smoke Detectors
Sprinkler Systems
There are two main categories of smoke detectors: optical detection (photoelectric) and physical process (ionization). Photoelectric detectors are classified as either beam or refraction. Beam detectors operate on the principle of light and a receiver. Once enough smoke enters the room and breaks the beam of light, the alarm is sounded. The refraction type has a blocker between the light and the receiver. Once enough smoke enters the room, the light is deflected around the beam to the signal. Finally, we have the ionization type detector; these detectors monitor the air around the sensors constantly. Once there is enough smoke in the room, the alarm will sound.
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