ORB-HT-51146-APO Apollo Orbis I.S. A1R Heat Detector with Flashing LED

Please note: this product is now obsolete, the recommended replacement is the Apollo ORB-HT-51145-APO Orbis A1R I.S. Heat Detector.

ORB-HT-51146-APO Apollo Orbis I.S. A1R Heat Detector with Flashing LED

The Orbis IS Heat Detector monitors temperature by using a single thermistor network which provides a voltage output proportional to the external air temperature. The Orbis IS range incorporates seven heat detector classes to suit a wide range of operating conditions.

Operation:

Orbis I.S. 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 temperature and compares them with per-set values to determine whether a fixed upper limit - the alarm limit - 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 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 then with a static detector so that a rate-of-rise detector is to be preferred to a static heat detector unless sharp increases of heat are part of the normal environment in the area protected by the heat detector.

Key Features:

• Can be used for applications where smoke detectors are unsuitable
• Ideal for environments that are dirty or smoky under normal conditions
• Reduced incidences of false alarms
• Increased reliability of detection