Conventional Detection

 Series 60 Heat Detector

The Series 60 heat detectors are resettable and operate by using a matched pair of thermistors to sense heat. One thermistor is exposed to the ambient temperature, the other is sealed. In normal conditions the two thermistors register similar temperatures, but, on the development of a fire, the temperature recorded by the exposed thermistor will increase rapidly, resulting in an imbalance of the thermistors and causing the detector to change to the alarm state.

Rate of rise detectors are designed to detect a fire as the temperature increases, but they also have a fixed upper limit at which the detector will go into alarm if the rate of temperature increase has been too slow to trigger the detector earlier.

Fixed heat detectors only change to the alarm state at a preset temperature. Externally, the heat detectors are distinguishable from smoke detectors by having wide openings to the surrounding atmosphere to allow good movement of air around the external thermistor.

 Series 60 mounting base

The base has been designed to enable detectors to be plugged in without any need for force - particularly useful when fitting to suspended ceilings. To make it even easier the base has a "one way only" fit. All Series 60 bases are lockable. The detectors are polarity insensitive and bases are easy to wire with an earth. connector.

The standard base contains no electronic parts which could be damaged during installation.

For conventional systems that are designed to operate correctly when one or more detector heads have been removed, a base fitted with a diode in Line 1 (positive line) is available.