Thorn Security Limited

Tyco Fire + Security Gmbh

Timothy Andrew James

Bernard E H Laluvein

John E A Shaw

Dave John Randall

A detector includes a component having a surface. The surface includes, or is at least partially coated with, a contaminant-resistant or self-cleaning material. This allows the detector to remain clean without manual cleaning.

Detector devices

A detector comprises a housing (), a pyroelectric array sensor () mounted within the housing, a heater () associated with the pyroelectric array sensor, and control means () for varying the power supplied to the heater to control the temperature of the pyroelectric array sensor relative to the ambient temperature in order to minimise the rate of change of temperature of the pyroelectric array sensor and to keep a predetermined difference between the temperature of the pyroelectric array sensor and the ambient temperature.

Detector

A flame detector is provided which comprises a housing (), a test source of electromagnetic radiation () and a sensor (). The source of electromagnetic radiation () and the sensor () are mounted within the housing (). The source of electromagnetic radiation () is arranged to direct its output onto the sensor (). The source of electromagnetic radiation () is arranged to emit radiation which simulates a flame. In this way, a means is provided within the housing () of the flame detector to test the flame detector without the need for an external test source, such as a test fire or a bulky and expensive test torch.

Flame detector and a method

A detector comprises a housing () having a window (), a measuring and processing unit (), a source () of electromagnetic radiation, a plurality of sensors (), and a reflector (). The measuring and processing unit (), the electromagnetic radiation source () and the sensors () are mounted within the housing (). The reflector () is mounted outside the housing (). The reflector () is positioned to reflect electromagnetic radiation passing through the window () from the electromagnetic radiation source () onto the sensors () via the window. The sensors () are operatively associated with the measuring and processing unit () to provide that unit with an input indicative of the level of electromagnetic radiation reaching the sensors.

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Timothy Andrew James