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Orbis Intrinsically Safe Conventional Optical Smoke Detector

The Orbis Intrinsically Safe Optical Smoke Detector works using the light scatter principle and is ideal for applications where slow-burning or smouldering fires are likely.

The design of the Orbis Intrinsically Safe Optical Smoke Detector allows it to respond to a wide spectrum of fires. The sensing chamber contains an optical sensor that measures back-scattered light as well as the more usual forward scattered light. As a result, the sensitivity to black smoke is greatly improved.

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


II 1G Ex ia IIC –40°C<Ta<+40°C(T5) / –40°C<Ta<+60°C(T4)

BASEEFA Certificate Number

ATEX - Baseefa 06 ATEX 0007X
IECEx - IECEx BAS 06.0002X

    Operating Voltage 14 to 28 VDC
    Quiescent Current 85µA at 24 VDC
    Operating Temperature
    -40°C to +70°C (no icing)
    Class T5: - 40°C to +40°C
    Class T4: - 40°C to +60°C
    Relative Humidity 0 to 98% (non condensing)
    IP Rating IP23D (indoor use)
    Size (inc base) 100mm D x 50mm H
    Weight (exc base) 75 grams
    Weight (inc base) 135 grams
    201-0604 Orbis I.S. Optical Smoke Detector