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Orbis Intrinsically Safe Optical Smoke Detector

Product Literature

  • Photoelectric Smoke Detector
  • Intrinsically Safe
  • Conventional Type
  • Marine Approved
  • For Hazardous Applications

Features and Benefits

  • Intrinsically safe optical smoke detector
  • Photoelectric detection principle
  • Designed to reduce significantly the incidence of false alarms through over-sensitivity to transient phenomena
  • Improved sensitivity to black smoke
  • Extra confirmation of smoke before the alarm signal given
  • Available as standard or with flashing LED

Product Summary

A conventional optical smoke detector approved for Marine use.  The performance of Orbis Marine optical detectors is good in black as well as white smoke.  In this respect Orbis is different from traditional optical smoke detectors which perform far better in white smoke than in black.  Orbis optical detectors are recommended for use as a general purpose smoke detectors for early warning of fire in most areas.

Operating Principles

Optical Smoke Detectors have always been recognised as good detectors for general use. They are regarded as particularly suitable for smouldering fires and escape routes.

The performance of Orbis IS optical detectors is good in black as well as in white smoke. In this respect Orb is is different from traditional optical smoke detectors which perform far better in white smoke than in black.

Orbis IS optical detectors are also designed to reduce significantly the incidence of false alarms through oversensitivity to transient phenomena.

Orbis optical detectors are recommended for use as general purpose smoke detectors for early warning of fire in most areas.

Orbis Marine Optical Smoke Detector

The sensing technology in the Orbis IS optical smoke detector is significantly different in design from previous optical detectors. A full description is given in the section ‘How do Orbis optical smoke detectors work?’ but the advantages of this system and its associated algorithms are:

  • improved sensitivity to black smoke
  • compensation for slow changes in sensitivity
  • extra confirmation of smoke before the alarm signal given

The algorithms are used to verify signals from the sensing chamber, to filter out transients and to decide when the detector should change to the alarm state.

All this combines to increase detection reliability and reduce false alarms.

How does the Orbis Marine Optical detector work?

Orbis operates on the wel l established light scatter principle.  The remarkable optical design of the Orbis IS optical smoke detector allows it to respond to a wide spectrum of fires.

The sensing chamber contains an optical sensor which measures back-scattered light as well as the more usual forward-scattered light. Sensitivity to black smoke is greatly

The detector is calibrated so that Orbis is highly reliable in detecting fires but is much less likely to generate false alarms than earlier 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 the likelihood of a detector producing an alarm as a result of smoke from smoking materia ls or from another non-fire source.

Technical Specifications and Ordering Information

Technical Specifications

Technical Data: Specifications are typical at 24V, 23°C and 50% relative humidity unless otherwise stated.
Principle of Detection: Photoelectric detection of light scattered by smoke particles over a wide range of angles.  The optical arrangement comprises an infra-red emitter 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.
Sampling Frequency: Once every 4 seconds
Supply Voltage: 14-28V DC
Supply Wiring: 2 wires, polarity sensitive
Polarity Reversal: Not allowed
Power-up Time: <20 seconds
Minimum ‘detector active’ voltage: 612V
Switch-on surge current at 24V: 105µA
Alarm Load: 325 ohms in series with a 1.0V drop
Minimum holding voltage: 5V
Minimum voltage to light alarm LED: 6V
Alarm reset voltage: <1V
Alarm reset time: 1 second
Remote output LED (-) characteristic: 4.7k ohms connected to negative supply
Material: Detector and base moulded in white polycarbonate
Alarm indicator: Integral indicator with 360° visibility
Dimensions and weight: 100 mm diameter x 42 mm
Weight, 75g
(In base) 100 mm diameter x 50mm
Weight, 135g
Temperature: Operating and storage
-40°C to +70°C
(no condensation or icing)
Humidity: 0% to 98% relative humidity  (no condensation)
Wind speed: Unaffected by wind
IP rating to EN60529: 23D

Specifications subject to change without notice.


Ordering Information

ORB-OP 52027-APO: Orbis IS Optical Smoke Detector
ORB-OP 52028-APO: Orbis IS Optical Smoke Detector with flashing LED