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Orbis I.S. Optical Smoke Detector


Orbis I.S.

Intrinsically Safe Optical Smoke Detector

  • TimeSaver® Base
  • Patented FasTest® enabling functional testing in four seconds
  • DirtAlert® indicates limit of drift compensation
  • Tolerates extreme operating conditions: -40°C to +70 °C
  • False alarm reduction Flashing LED option
  • Warranty 10 years
Datasheet : Orbis I.S. Optical Smoke Detector (EN)

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.

Key features :

  • Reduces false alarms
  • Recommended for early warning of fire in most areas
  • Improved sensitivity to black smoke
  • Compensation for slow changes in sensitivity
  • Algorithms for reliability of alarm

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.


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.


General applications

  • Dusty environments
  • Dangerous areas
  • Offshore platforms
  • Refineries
  • Small and medium buildings


Maximum power-on time <20 seconds
Quiescent current: 85μA
Quiescent current tested at: 24 V DC
Sampling frequency: once every 2 seconds
Polarity L1 and L2 is sensitive to polarity
Minimum voltage of the “active detector”: 12 V
Holding voltage (min.): 5 V
Minimum voltage to light the alarm LED: 6V
Alarm reset voltage: <1 V
Alarm reset time: 1s
Alarm load: 325 Ω in series with a drop of 1.0 V


Humidity: 0% to 98% (no condensation or icing)
Nominal value: IP IP23D
Storage temperature: -40 ° C to + 70 ° C




Weight: 75g
Colour: White
Materials: Polycarbonate housing
Product length: 42 mm
Product diameter: 100 mm
Detection principle: Photo-electric light scattering.



A2S (Advanced Safety Solutions) 350 Avenue JRGG de la Lauzière 31 Parc du Golf - CS 90519 13593 Aix en Provence Cedex 3


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