The presence of smoke in a ventilation duct is detected by sampling the airflow through the duct via two sampling tubes. A detector and base are mounted within the sampling chamber, which is located on the external skin of the duct, with sample and exhaust probes passing into the duct in an area of low turbulence. The unit requires an analogue optical sensor or conventional optical detector and corresponding base and is supplied with full fixing instructions.

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• Technical Datasheet (PDF)