Smoke detector for fire alarm system has switching device for timed activation or de-activation of smoke detector or its alarm circuit

摘要

The smoke detector responds to detection of smoke within a monitored room or area for providing a signal via an alarm circuit, with at least one switching device , e.g. with a movement sensor, a heat sensor and/or a gas concentration sensor, used for timed activation or de-activation of the smoke detector or the alarm circuit.