The XP95 Optical Smoke Detector uses the same outer case
as the ionization smoke detector and is distinguished by the
indicator LED which is clear in standby and red in alarm.
Within the case is a printed circuit board which on one side
has the light proof labyrinth chamber with integral gauze
surrounding the optical measuring system and on the other
the address capture, signal processing and communications
An infrared light emitting diode within its collimator is
arranged at an obtuse angle to the photo-diode. The photodiode has an integral daylight blocking flter.