

Intrinsically Safe Heat Detector
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.
Key Features :
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.
Options
The Orbis I.S. range incorporates seven heat detector classes to suit a wide variety of operating conditions in which smoke detectors are unsuitable.
The European standard EN54-5:2000 classifies heat detectors according to the highest ambient temperature in which they can safely be used without risk of false alarm. The classes are identified by the letters A to G. (Class A is subdivided into A1 and A2.) In addition to the basic classification, detectors may be identified by suffix to show that they are rate-of-rise (suffix R) or fixed temperature (suffix S) type.
All heat detectors in the Orbis I.S. range are tested as static or Rate-of-rise detectors and are classified as A1R, A1S, A2S, BR, BS, CR and CS.
Environmental Characteristics
The environmental performance is similar to that of the Orbis I.S. optical smoke detector but it should be noted that heat detectors are designed to work at particular ambient temperatures. Also classification and BASEEFA certificate number are the same as for the optical smoke detector.
Operating and storage temperature: –40°C to +70°C
Operating temperature is restricted by the intrinsic safety gas classification.
Class T5: –40°C to +45°C
Class T4: –40°C to +60°C
The detector must be protected from conditions of condensation or icing.
Data sheet
Key features:
ref.: fab.: 55000-440SIL
The XP95 IS heat detector differs from the XP95 IS smoke detectors by its low resistance to airflow housing that allows good contact between the detection thermistor and ambient air.
Data sheet
55000-540SIL
Key features:
The XP95 IS Ionisation Smoke Detector uses a low activity radioactive foil to detect fires by irradiating the air in the smoke chambers causing a current flow. If smoke enters the chamber current flow is reduced leading to an alarm.
Data sheet
Key features:
Very simple to implement, aesthetic and discreet, the F5000 motorized linear smoke detector is connected to addressable detection lines using an addressing module. It is equipped with a wall-mounted control box allowing calibration and commissioning from the ground. This control box (and the linear detector) must be powered through an external AES power supply. Two detectors can be connected to the same control box depending on the site configuration. This detector is associated with a DHW central unit as part of the NF-SSI.
Two kits are offered: each includes a linear detector and a reflector allowing monitoring a length of 0 to 50 meters. The kit also includes the wall control box. To monitor a length of 50 to 100 meters you must add a kit of 3 reflectors.
Data sheet
Key features:
The Orbis IS Multisensor Smoke Detector benefits from the same false alarm technology as the Optical Smoke Detector with the addition of a heat sensing element.
Key Features :Environmental Characteristics
The environmental performance is similar to that of the Orbis I.S. optical smoke detector but it should be noted that heat detectors are designed to work at particular ambient temperatures. Also classification and BASEEFA certificate number are the same as for the optical smoke detector.
Operating and storage temperature: –40°C to +70°C
Operating temperature is restricted by the intrinsic safety gas classification.
Class T5: –40°C to +45°C
Class T4: –40°C to +60°C
The detector must be protected from conditions of condensation or icing.
Data sheet
Key features:
The Orbis IS Optical Smoke Detector works using the light scatter principle and is ideal for applications where slow-burning or smouldering fires are likely.
Principle of detection: Photoelectric detection of light scattered by smoke parivles over a wide range of angles. The optical arrangement comprises an infra-red wmitter with a prism and a photo-diode at 90° to the light beam with a wide field of view. The detector’s microprocessor uses algorithms to process the sensor readings.
Main characteristics:
Operation :
The Orbis I.S Optical Smoke Detector operates on the well established light scatter principle. The remarkable optical design of the Orbis I.S. optical smoke detector allows it to respond to a wide spectrum of fires. The sensing chamber of the Orbis I.S. Optical Smoke Detector contains an optical sensor which measures back-scattered light. Sensitivity to black smoke is greatly improved. The detector is calibrated so that it is highly reliable in detecting fires but is much less likely to genereate false alarms than ionisation smoke detectors. The stability of the detector – high reliability, low false alarm rate – is further increased by the use of algorithms to decide when the detector should change to the alarm state. This removes likelihood of a detector producing an alarm as a result of smoke from smoking materials or from another non-fire source. The sensing chamber has been designed to keep out dust and other airborne contaminants.
Options
The Orbis I.S. range incorporates seven heat detector classes to suit a wide variety of operating conditions in which smoke detectors are unsuitable.
Environmental Characteristics
Operating and storage temperature: –40°C to +70°C
Operating temperature is restricted by the intrinsic safety gas classification.
Class T5: –40°C to +45°C
Class T4: –40°C to +60°C
The detector must be protected from conditions of condensation or icing.
Data sheet
Discovery Marine Multi-sensor Detector (Optique/Thermique) (SIL2)
Data sheet