Beam Detectors

Optical beam smoke detectors work on the principle of light obscuration, where the presence of smoke blocks some of the light from the beam,typically through either absorbance or light scattering. Once a certain percentage of the transmitted light has been blocked by the smoke, a fire is signalled.

There are two types of beam detectors: Receiver-transmitter type and reflector type. First type consists of receiver and transmitter unit. In normal state, IR light beams sent from transmitter reach the receiver unit. In case of fire, smoke obstruct the IR light beams and some of light rays can not reach receiver unit.