Photoelectric Smoke Detector

Photoelectric Smoke Alarm along with Battery Backup can act as a stand-alone unit or can be integrated into an existing electrical system. This unit sounds as an early warning to alert you and your family of the presence of visible fire particles detected by the alarm's photoelectric sensor

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Detailed Description for Photoelectric Smoke Detector

A device called Smoke Detectors senses smoke, typically as an indicator of fire. Commercial security device issue the signal to a fire alarm control panel as part of a fire alarm system, while household detectors, known as smoke alarms, generally issue a visual alarm or local audible from the detector itself.

 

 An optical smoke detector or photoelectric smoke detector contains a source of infrared, or ultraviolet light (typically an incandescent light bulb or light-emitting diode), visible, a lens, and a photoelectric receiver (typically a photodiode). In spot-type detectors, all of these components are arranged inside the chamber where air, which may contain smoke from a nearby fire, flows. In large open areas such as atria and auditoriums, projected-beam or optical beam smoke detectors are used instead of a chamber within the unit, a wall-mounted unit emits a beam of ultraviolet or infrared light which is either received and processed by a separate device and reflected back to the receiver by a reflector. In some types, particularly optical beam types, a light emitted by the light source passes through the air being tested and reaches the photosensor. The received light intensity can be reduced by absorption due to smoke, airborne dust, or other substances; the circuitry detects the light intensity and they generate the alarm if it is below a specified threshold, potentially due to smoke. In other types, typically chamber types, the light is not directed at a sensor, which is not illuminated in the absence of particles. If the air in the chamber contains particles (smoke or dust)  then the light is scattered and some of it reaches the sensor, triggering the alarm.

 

Model

2-wire

(OR-S814-2)

3-wire

(OR-S814-3)

4-wire

(OR-S814-4)

Input Voltage DC 12-35V
Static Current ≤50uA (DC 12-35V)
Alarm Current  40-80mA (DC 12-30V)
Operating Humidity 10%-95% RH (Non coagulating)
Operating Temperature -10°C- +55°C
Alarm Reset Auto reset (power off reset, ≤0.5s optional)
LED Indication Detecting: Green LED flash    Alarm: Red LED ON
Installation Ceiling mounted  
Detecting Area  60m² (with 4 meter height)    
Detecting Sensitivity m=0.5dBm-1
Dimension Φ100*45mm

 

Although photoelectric alarms are highly effective at detecting smoldering fires and do provide adequate protection from  fire safety experts, flaming fires and the National Fire Protection Agency recommend installing what are called combination alarms, which are alarms that either detects both heat and smoke or use both the ionization and photoelectric processes. Some combination alarms include a carbon monoxide detection capability.

The type and sensitivity of the light source and the photoelectric sensor, and the type of smoke chamber differ between manufacturers.

Generally, they are more effective in detecting smoldering fires, which smolder for hours before bursting into flame. Sources of the fires include cigarette smoldering in couches or bedding.

 


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