Ideal in environments that dirty or smoky under normal conditions
Well suited for warehouses, loading bays and car parks
Unaffected by wind or atmospheric pressure
Remote test feature
The heat detector operates 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 thermintors register similar temperatures,
but, on the development of a fire, the temperature recorded by the exposed thermister will increase rapidly,
resulting in an imbalance of the thermistors and causing the dtector to change to the alarm state.
A1R, BR and CR are Rate of Rise detectors, 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.
CS detector is a fixed heat detector which only changes to the alarm state at a preset temperature.
The A1R, BR and CR (rate-of-rise) heat detectors
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, causing the detector to change into
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.
The CS (static response) heat detector has only
one thermistor and changes to the alarm state
at a preset temperature. Externally, the heat
detectors are distinguishable from the smoke
detectors by having wide openings to the
surrounding atmosphere to allow good movement
of air around the external thermistor.
