Tyco Fire + Security Gmbh

Johnson Controls Fire Protection LP

Thorn Security Limited

Andrew D Naish

Faruk Meah

Steven Ian Bennett

Stephen John Penney

The system includes an active unit, such as a detector unit, which has a processor, a network port for connection to a central control unit, and an optical data input port. The processor is arranged to enable the optical data input port on receipt of an enable signal received by the active unit from the central control unit via a network.

Detector system

The detector has a first optical smoke detector having a first smoke detector light source arranged for emitting a first beam of light and a first scattered light sensor positioned to detect light from the first beam which is scattered by smoke present within a detection zone; a second optical smoke detector having a second smoke detector light source arranged for emitting a second beam of light and a second scattered light sensor positioned to detect light from the second beam which is scattered by smoke present within the detection zone; and an object proximity detector to detect an object in the detection zone.

Chamberless smoke detector

An isolator circuit () for a unit of a safety system () includes a power control line () connectable to a first loop of a safety system and a power connection () connectable to a second loop of the safety system. A switch () is connected to the power control line (), and the switch has a closed configuration and an open configuration. A controller () controls the configuration of the switch (). If a voltage across the circuit () from the power connection () to the power control line () falls below a predetermined level, the controller () opens the switch (), thereby causing a disconnection to occur in the first loop.

Isolator circuit

A nodal system () includes a unit (D) having a memory () and an optical data receiver (), and a common control unit () in communication with the unit. A method of commissioning the system comprises the steps of activating the optical data receiver on the unit, and transmitting an optical data signal to the unit, thereby commissioning the unit.

Growing community of inventors

Staines, United Kingdom

Andrew D Naish