C-9105R
Conventional Reflective Beam Detector
Installation and Operation Manual
The Intelligent Solution
5
(3) Operation
Principle
The detector and reflector are placed oppositely. The detector
includes emitting part and receiving part. Infrared beam of certain
intensity sent out from the emitting part is reflected by the right-angle
prisms of the reflector, and then received by the receiving part of the
detector. The receiving part simultaneously collects and amplifies the
returned infrared beam, analyzes and judges the collected signals
through its microprocessor. When the detector is in normal
monitoring state, the intensity of infrared beam received by the
receiving part is steady at a certain level. When smoke particles
enter the detecting area, the intensity of infrared light received by the
receiving part falls owing to light scattering. When the smoke
particles reach a certain density, and the intensity of infrared light
received by the receiving part is reduced below the preset threshold
value, the detector alarms fire, illuminates Red LED, and closes
volt-free fire output contact. Operation principle is shown in Fig. 3.
00m
Smoke
Reflector
Mounting
Bracket
Infrared
Beam
Detector
Fig. 3
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