XP95 I.S. optical smoke detector

The XP95 I.S. optical smoke detector is included in the BOSEC B-9072-FD-954 EN54-13 certificate of the MD2400(L) analogue addressable fire detection system.

The XP95 intrinsically safe (I.S.) optical smoke detectors have all the benefits of the standard range, but have been specially designed for use in hazardous areas. The XP95 I.S. optical smoke detectors are always used in combination with a galvanic barrier and a XP95 single channel protocol translator.

The XP95 I.S. optical smoke detector is composed of a white, flame-retardant polycarbonate housing. The smoke detector is equipped with a white LED, which is red in case of an alarm, and a unique addressing mechanism, the XPert card. The XPert card is placed in the base of the detector, while the base is completely free of electronics.

The XP95 I.S. optical smoke detector works on the light scatter principle and is ideal for applications where slow burning or smoudering fires are likely.

Within the case is a printed circuit board which on one side has the light proof labyrinth chamber with integral gaze surrounding the optical measuring system and on the other the address capture, signal processing and communications electronics.

An infrared 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 infrared LED emits a burst of collimated light every second. In clear air the photo-diode receives no light directly from the infrared LED because of the angular arrangement and the dual mask. When smoke enters the chamber, it scatters photons from the emitter infrared LED onto the photo-diode in an amount related to the smoke characteristics and density.

The microprocessor in the MD2400(L) fire alarm control panel compares the received signals with the stored data and initiates, with increasing smoke concentrations, respectively a pre-alarm or an alarm announcement.