Model SPC-ET is a two wire beam smoke detector that consists of an emitter and receiver that cover a distance of 5 – 100 m providing a maximum coverage of 1500 m2. When used on a conventional system the emitter and receiver can be powered directly from the zone or if required the emitter also has an option to be powered from a separate 24 V dc supply. The SPC-ET can also be interfaced to Hochiki’s ESP system, the receiver can be connected to a CHQ-SZM Single Zone Module or a CHQ-DZM Dual Zone Module, and the emitter can then be powered directly from the loop or via a separate 24 V dc supply. The SPC-ET comes complete with a termination module which fits directly on to a standard U.K dual back box, this allows the detector be surface or flush mounted. Line continuity options can be selected on the termination module and these are based on the Schottky or Zener diode method.