Sensors and other Analogue Addressable Devices

Optical Smoke Detector

The Discovery optical smoke detector uses an IR LED which pilses light across a smoke chamber with a photo-diode set an obtuse angle. In clear air it receives no light, but when smoke enters the chamber, light from the LED is scattered onto the photo-diode. A signal is then processed to provide an alanlogue value for tranmission when the detector is polled.

*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.

Multisensor Detector

The Discovery multisensor detector contains an optical smoke sensor whose outputs are combined to give the final analogue value. The multisensor is therefore useful over a wide range of applications, and is highly immune to false alrm sources.

*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.

Carbon Monoxide Detector

The Discovery CO fire detector contains a long-life electro-chemical carbon monoxide sensor. The detection capabilities are enhanced by a rate-senstive responce. Please note: CO fire detect smoke particles or heat are not universal replacements for smoke detectors.

*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.

Heat Detector

The Discovery heat detector, distinguishable by the low airflow resistant case, uses a single thermistor to sense the air temperature around the detector. The thermistor is connected in a resistor network, which produces a voltage output dependent on temperture.

*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.

Ionisation Smoke Detector

Air in the sensing chamber becomes irradiated, producing both positive and negative ions which are attached to the electrodes of the opposite sign. This results in a small electric current flowing between them. When the smoke particules enter the chamber, they become attached to the ions, reducing the flow of current. This imbalance of the electrodes causes the detector to produce a signal which is transmitted to the control panel.

*As out policy is one of constant product improvement the right is therefore reserved to modify product specifications without prior notice.

Manual Call Point

When Operation, the manual call point interrupts the polling cycle for a fast responce.

Interface

Each detector in the Distovery can operate in one of five responce modes, which can be selected from the control panel. Mode selection depends on application - Mode 1 will give a higher sensitivity to five than Mode 5. See table below for more information.

Discovery is compatiable with all XP95 panels. Please refer to the Discovery Engineering Product Guilde, PP2052 for further information.

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