A light emitter and receiver create the open light path of an Opsis air quality monitoring system.
Light is generated by a xenon lamp in the emitter and projected to the receiver.
From the receiver, it is passed to the analyzer through a fibre optic cable. The ER 110 and ER 150 are for fixed light paths. The emitters use an Opsis PS 150 power supply unit, which requires an electrical connection to mains. The ER 110 is for light paths of up to 500 metres and the ER 150 is for light paths of up to 1000 metres. In multiple path systems, the fibre optic connections to the analyzer are made through a multiplexer.