Operating Principles
The Discovery Marine Optical Smoke Detector has a white moulded polycarbonate case with wind-resistant smoke inlets. The indicator LEDs are colourless when the detector is in quiescent state and red in alarm. Within the case is a printed circuit board which, on one side, has the light-proof chamber with integral gauze surrounding the optical measuring system and, on the other, the signal processing and communications electronics.
An infra-red light emitting diode within its collimator is arranged at an obtuse angle to the photo-diode. The photo-diode has an integral daylight-blocking filter.
The IR LED emits a burst of collimated light every second. In clear air the photo-diode receives no light directly from the IR LED, because of the angular arrangement and the chamber baffles. When smoke enters the chamber it scatters light from the emitter IR LED onto the photo-diode in an amount related to the smoke characteristics and density. The photo-diode signal is processed to provide an analogue value for transmission when the detector is interrogated.
Device Addressing
For details refer to datasheet PP2479.
Communication
Discovery
Maintenance & Service
Detectors should be maintained according to BS 5839-1 or other locally applicable code. Test equipment can be ordered from Apollo for testing smoke and heat detectors.
Detectors should not be cleaned in the field except for careful removal of exterior dirt with a damp cloth. For cleaning and recalibration detectors should be returned to Apollo Fire Detectors or to the local distributor.
EMC Directive 2014/30/EU
The product complies with the essential requirements of the EMC Directive 2014/30/EU, provided that it is used as described.
Construction products regulation 305/2011
The product complies with the essential requirements of the Construction Products Regulation 305/2011.
Product Information
The Discovery Marine Optical Smoke Detector operates using the light scatter principle and is ideal for applications where slow-burning or smouldering fires pose a potential risk.
Key Features
Responds well to slowburning, smouldering fires
Suitable for bedrooms and escape routes
Unaffected by wind or atmospheric pressure
Remote test feature
Rejection oftransient signals
