Optical smoke detectors incorporate a pulsing LED located in a labyrinth within the housing of the detector. The labyrinth is designed to exclude light from any external source. At an angle to the LED is a photo-diode which, in clear air conditions, does not receive light directly from the LED. The detector transmits a clear air signal to the control panel. When smoke enters the labyrinth, light is scattered onto the photo-diode and the signal to the panel increases. The signal is processed by the electronic circuitry and transmitted to the control equipment in exactly the same way as in the case of the ionization smoke detector.
- Warranty
- 10 year
- Applications
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- Escape routes
- Hazardous areas
- Medium to large buildings
- Offshore platforms
- Refineries
- Fire Type
- Slow burning, smouldering fires
- Default Variant
- No
- Website Categories
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- SIL Approved Devices
- Intrinsically Safe
- Analogue Addressable
- Website Specialist Applications
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- SIL Approved
- Intrinsically Safe
- Marine
- Offshore
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- Colour
- White
- Sensor configuration
- Horizontal optical bench housing infra-red emitter and sensor, arranged radially to detect forward scattered light.
- Weight
- 105g
- Materials housing
- Polycarbonate
- Product diameter
- 100mm
- Detection principle
- Photo-electric light scattering.
- Product diameter
- 3.94in
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- Approvals
-
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- Protocol voltage
- 5 to 9V peak to peak
- Protocol voltage (max)
- 9V
- Protocol voltage (min)
- 5V
- Quiescent current
- 340μA
- Quiescent current tested at
- 24V dc
- Polarity
- L1 & L2 are polarity sensitive
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- Humidity (max)
- 95% RH
- Humidity (min)
- 0% RH
- Humidity Note
- no condensation or icing
- Humidity
- 0% to 95% (no condensation or icing)
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