Independent smoke alarm full name of the independent photoelectric smoke fire detection alarm, referred to as independent smoke detectors or independent smoke detectors, smoke alarm is a series of products. It is widely used in hotels, shops, Internet cafes, dance halls, cafe, lounge, residential and other places for fire safety. It is widely used in hotels, monitor.

Smoke detectors:

 One is the ion smoke detector, one is the photoelectric smoke detectors, it is inside and outside the ionization chamber inside the radioactive source americium 241, ionization generated positive and negative ions, under the action of the electric field to the positive and negative electrodes to move. Under normal circumstances, both inside and outside the ionization chamber current, voltage is stable. once there is smoke to flee outside the ionization chamber. Disturb the normal movement of charged particles, so that the current, voltage has changed, undermine the balance between the internal and external ionization chamber, so the signal was issued. There is also a photoelectric induction detector, which has a light-emitting element and a photosensitive element, the light emitted by the usual light, through the lens to the photosensitive element, the circuit to maintain normal, if there is smoke from the barrier to reach the photosensitive element on the light Significantly weakened, so the photosensitive element put the changes in light intensity into electrical changes, through the amplifier circuit to the people alarm. There is also a pipelining smoke detector, which works in a similar manner to another scattering type in a photoelectric sensor, which produces a photosensitive current through the reflection or scattering of smoke, mainly on the ship. In recent years there have been laser smoke detector, it is also the use of photoelectric induction principle, the difference is the use of laser light beam. This detector uses semiconductor devices, small size, low price, vibration resistance, long life, very promising.