Orbis Marine Heat Detector

The Orbis range incorporates seven heat detector classes to suit a wide variety of operating conditions in which smoke detectors are unsuitable.  All heat detectors in the Orbis range are tested as static or rate-of-rise detectors.

Orbis heat detectors have an open-web casing which allows air to flow freely across a thermistor which measures the air temperature every 2 seconds.  A microprocessor stores the temperatures and compares them with pre-set values to determine whether a fixed upper limit – the alarm level – has been reached.

In the case of rate-of-rise detectors the microprocessor uses algorithms to determine how fast the temperature is increasing.

Static heat detectors respond only when a fixed temperature has been reached.  Rate-of-rise detectors also have a fixed upper limit but they also measure the rate of increase in temperature.  A fire might thus be detected at an earlier stage than with a static detector so that a rate-of-rise detector is to be preferred to a static heat detector unless sharp increase of heat are part of the normal environment in the area protected by the heat detector.