Method and device for fire detection in volumes

摘要

The method involves filtering air-dust mixture from enclosed environment by using a filter (2) and checking aspirated air-dust mixture for burning characteristics. Functioning of the filter is monitored. Fire detection is performed outside ex-zones, using an aspirating smoke detector system (7). A signal is generated by a signal processing unit (15) of a malfunction monitoring sensor (14) when the filter is determined as faulty so as to trigger a subsequent action that prevents ingress of an aspirated air-dust mixture with an elevated dust concentration into the detector system. The ex-zones are storage areas/enclosed environments, which are subject to regulations for protection against explosion. The burning characteristics are indicators such as smoke, heat and flame radiation, and combustion gases. An independent claim is also included for a fire detection device for use in enclosed environments, comprising a filter monitoring unit.