High Sensitive Standalone Smoke Detector
An ionization smoke detector uses a radioisotope , typically americium-241 , to ionize air; a difference due to smoke is detected and an alarm is generated . Ionization detectors are more sensitive to the flaming stage of fires than optical detectors , while optical detectors are more sensitive to fires in the early smoldering stage.
Black poisonous smoke is the first sign of fire , It can alert you even before the flames become visible , Or turn into a fatal enemy if left unnoticed . smoke detectors use cutting-edge technology to detect the faintest traces of smoke in a home , giving you enough time to get to the nearest extinguisher and defeat the fire , Dual chamber ionization technology provides the highest degree of sensitivity and reliability , An independent 9 volt power supply and a low battery warning system ensure that the smoke detector is always in working condition , The loud 85 dB(A) alarm guarantees to alert you even if a fire breaks out late at night also.
The smoke detector has two ionization chambers , one open to the air , and a reference chamber which does not allow the entry of particles . The radioactive source emits alpha particles into both chambers , which ionizes some air molecules . There is a potential difference (voltage) between pairs of electrodes in the chambers ; the electrical charge on the ions allows an electric current to flow . The currents in both chambers should be the same as they are equally affected by air pressure , temperature , and the ageing of the source . If any smoke particles enter the open chamber , some of the ions will attach to the particles and not be available to carry the current in that chamber , An electronic circuit detects that a current difference has developed between the open and sealed chambers , and sounds the alarm , The circuitry also monitors the battery used to supply or back up power , and sounds an intermittent warning when it nears exhaustion , A user-operated test button simulates an imbalance between the ionization chambers , and sounds the alarm if and only if power supply , electronics , and alarm device are functional .
The current draw of an ionization smoke detector is low enough for a small battery used as sole or backup power supply to be able to provide power for months or years without the need for external wiring.