RIN9524 - APOLLO XP95 optical smoke sensor by Sicurit
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Optical analogue smoke sensor “APOLLO” XP95 24Vac
The interior of the optical smoke detector consists of an electronic circuit, equipped on one side of the optical chamber by the detection labyrinth. On the other side of the circuit there are the address pins and all the electronics for signal processing and communication. The optical chamber is also surrounded by a dense metal mesh suitable for protection from dust and insects. An intermittent infrared light is generated inside the optical chamber by an emitting diode. A collimator prevents the generated optical signal from affecting a receiving photo diode. The diode emits a pulse of IR light every second. In clear air conditions, the receiver photo diode is not affected by the beam of light generated by the emitter. When the smoke enters the chamber, due to the refraction of light against the particles of matter, part of the light emitted goes to affect the photo-diode receiver. The signal generated by the latter is processed by the ASIC circuit to evaluate the intensity of the signal (smoke) and sent to an A / D converter. The EN54 alarm thresholds are also stored in the ASIC circuit. If the time between one polling and the next is greater than one second and the detector autonomously goes into alarm, a spontaneous transmission of the address and alarm values (Alarm Flag) takes place. This feature allows the transmission of the alarm signal in about 2 seconds. The detector at rest generates an analogue signal with a value of 25 ± 7, a value of 55 corresponds to an EN54 alarm. XP95 detectors are insensitive to wind and atmospheric pressure and have a temperature range between - 20 ° C and + 60 ° C. (LPCB, VDS and CPD CERTIFICATE).
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