20 Facts About Smoke detectors

Smoke detectors detector is a device that senses smoke, typically as an indicator of fire.

Smoke detectors are usually housed in plastic enclosures, typically shaped like a disk about 150 millimetres in diameter and 25 millimetres thick, but shape and size vary.

Smoke detectors can be detected either optically or by physical process .

Smoke detectors expected the gas entering the sensor to bind to ionized air molecules and thereby alter an electric current in a circuit of the instrument.

Smoke detectors invented a cold cathode tube that could amplify the small signal generated by the detection mechanism so that it was strong enough to activate an alarm.

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Smoke detectors can be detected using a photoelectric sensor or an ionization process.

In large open areas such as atria and auditoriums, optical beam or projected-beam smoke detectors are used instead of a chamber within the unit: a wall-mounted unit emits a beam of infrared or ultraviolet light which is either received and processed by a separate device or reflected to the receiver by a reflector.

Smoke detectors detector has two ionization chambers, one open to the air, and a reference chamber which does not allow the entry of particles.

Ionization smoke detectors are usually cheaper to manufacture than optical detectors.

Amount of elemental americium-241 in ionization smoke detectors is small enough to be exempt from the regulations applied to larger deployments.

Amount of Americium-241 contained in ionizing smoke detectors doesn't represent a significant radiological hazard.

Smoke detectors are not susceptible to false alarms due to particles making them particularly suitable for use in dusty and dirty environments.

Wireless smoke and carbon monoxide detectors linked to alert mechanisms such as vibrating pillow pads for the hearing impaired, strobes, and remote warning handsets are more effective at waking people with serious hearing loss than other alarms.

Mains-operated Smoke detectors have disposable or rechargeable batteries; others run only on 9-volt disposable batteries.

Some mains-powered Smoke detectors are fitted with a non-rechargeable lithium battery for backup with a life of typically ten years.

Optical Smoke detectors are less susceptible to false alarms in locations such as near a kitchen producing cooking fumes.

All smoke detectors must be hooked directly to the electrical wiring, be interconnected and have a battery backup.

Commercial smoke detectors are either conventional or addressable, and are connected to security alarm or fire alarm systems controlled by fire alarm control panels .

So-called "conventional detectors" are smoke detectors used in older interconnected systems and resemble electrical switches by their way of working.

Detectors become contaminated usually as a result of the build up of atmospheric particulates in the Smoke detectors being circulated by the heating and air-conditioning systems in buildings.