Orbis I.S. Optical Smoke Detector with Flashing LED

Product code: ORB-OP-52028-APO

ORB-OP-52028-APO - Orbis I.S. Optical Smoke Detector with Flashing LED
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.
Full Details

Application Environments

Dusty environments

Escape routes

Hazardous areas

Offshore platforms


Small to medium buildings

Brand Features

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


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 smokung materials or from another non-fire source. The sensing chamber has been designed to keep out dust and other airborne contaminatnts.

Environmental Characteristics

The operating temperature for instrinsically sage detectors is restricted by the gas temerature class. See technical data for full details. 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.

Technical Data

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.

Additional Information 1

Wiring and cable types It is not permitted to connect more than one circuit in the hazardous area to any one safety barrier and that circuit may not be connected to any other electrical circuit. Both separate and twin cables may be used. A pair contained in a type 'A' or 'B' multicore cable (as defined in clause 12.2.2 of BS EN 600079-14:2008) may also be used, provided that the peak voltage of any circuit contained within the multicore does not exceed 60V. The capacitance and either the inductance to resistance (L/R) ratio of the hazardous area cables must not exceed the parameters specified in datasheet PP2479. The reason for this is that energy can be stored in a cable and it is necessary to use cable in which energy stored is insufficient to ignite an explosive atmosphere. To calculate the total capacitance or inductance for the length of cables in the hazardous area, refer to datasheet PP2479, which gives typical per kilometer capacitance and and inductance for commonly used cables. (Note: all Orbis I.S. devices have zero equivalent capacitance and inductance.) Maximum loading of I.S. circuit Because of the finite resistance of the safety barrier, there will be a limit to the current drain which can be tolerated before the voltages on the circuit fall outside the specified limits for Orbis I.S. devices. The system certification allows up to 20 Orbis I.S. detectors to be connected to a single barrier circuit with an end-of-line resistor or not less than 1.8Ω. However, it must be ensure that the voltage available at each detector is above at the minimum specified in the quiescent condition. It is also important to ensure that the alarm load is suitable for the control and indicating equipment. the system certification also allows the use of remote LED indicators. These may be connected to individual detectors or may use a connection common to two or more detectors.

Product Information

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.

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

Additional Information 2

Installation It is important that the Orbis I.S. detectors be installed in such a way that all terminals and connections are protected to at least IP20 when the detector is in the base. Special care must be taken with the rear of the mounting base where live metal parts may be accessible. Flush mounting of the base on a flat surface will provide the required degree of protection. The conduit box available from Apollo, part no. 45681-204, is also acceptable for mounting I.S. bases. Apollo also supply a range of deckhead mounting boxes. For more information, please refer to PP1089, bases and accessories brochure. Note that the earth terminal in the base is provided for convenience where continuity of a cable sheath or similar is required. It is not necessary for the correct operation of the detector nor is it provided as a termination point for a safety earth.

  • Dusty environments
  • Escape routes
  • Hazardous areas
  • Offshore platforms
  • Refineries
  • Small to medium buildings
Warranty10 year
Chamber typeChevron
Maximum power-up time<20 seconds
Quiescent current85μA
Quiescent current tested at24V dc
Sampling frequencyOnce every 4 seconds
PolarityL1 & L2 are polarity sensitive
Minimum 'detector active' voltage12V
Holding voltage (min)5V
Minimum voltage to light alarm LED6V
Alarm reset voltage<1V
Alarm reset time1s
Alarm load325Ω in series with a 1.0V drop
Humidity (min)0% RH
Humidity (max)98% RH
IP rating ValueIP23D
Storage temperature (min)-40°C
Storage temperature (max)70°C
Storage temperature-40 to 70°C
  • BV
  • LR
  • LPCB
  • KRS
  • IECEx
  • FG
  • DNV.GL
  • CCS
  • SBSC
  • CPR
  • PESO (CCoE)
  • ABS
Materials housingPolycarbonate
Product length42mm
Product diameter100mm
Detection principlePhoto-electric light scattering.
Sensor configurationChamber with surface-mount infrared emmiter and prism. Solid state integrated photo-diode and amplifier.
How to Order

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