Orbis Intrinsically Safe (IS) Heat Detector


Orbis Intrinsically Safe (IS) Heat Detector


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    Orbis Intrinsically Safe (IS) Heat Detector

    The Orbis IS Heat Detector is for use in applications where smoke detectors are unsuitable and are commonly used where there is a danger of nuisance alarms from smoke detectors.

    The Orbis IS range incorporates 7 heat detector classes to suit a wide variety of operating conditions in which smoke detectors are unusable.

    Orbis IS Heat Detectors have an open-web casing which allows air to flow across a thermistor which measures the air temperature every 2 seconds. The temperatures are then compared to pre-set values to determine whether the alarm level has been reached.

    Classes available:

    • Class A1R
    • Class A1S
    • Class A2S
    • Class BR
    • Class BS
    • Class CR
    • Class CS

    Please note, all Orbis Intrinsically Safe Detectors require an Orbis Intrinsically Safe Base in order to be mounted.

    Key Features

    • TimeSaver base provides simple installation
    • StartUp flashing LED to confirm devices are wired in the correct polarity
    • Continuity link enables voltage testing of zone wiring before commissioning
    • DustDefy system prevents dust ingress while maintaining airflow
    • Transient rejection uses algorithms to reduce false alarms
    • Drift compensation maintains calibrated sensitivity levels even if the detector is contaminated
    • DirtAlert shows the drift compensation limit has been reached
    • Sensalert indicates incorrect detector operation
    • FasTest maintenance procedure takes just 4 seconds to complete
    • E-Z fit slots allow base to be fixed in position without removing mounting screws
    • 360° visibility of LEDs


    The Orbis IS Optical Smoke Detector is suitable for use on marine and offshore applications as well as land-based systems and has been tested and approved to the following standards:

    European Standard EN54 Fire Detection and Fire Alarm Systems:

    • EN54-5: 2000

    Electromagnetic Compatibility:

    • EN61000-6-3
    • EN50130-4

    ATEX-Related Standards:

    • BSEN60079-0:2004
    • IEC60079-0:2004
    • EN50020:2002
    • EN/BSEN/IEC60079-26:2004

    Marine Type Approval Standards:

    • American Bureau of Shipping (ABS)
    • Bureau Veritas (BV)
    • Det Norske Veritas (DNV)
    • Germanischer Lloyd (GL)
    • Lloyds Register (LR)

    Technical Specification

    • Sampling Frequency: Once every 2 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: 12V
    • Switch-on Surge Current at 24V: 105uA
    • Average Quiescent Current at 24V: 80uA
    • 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: 4.7kOhms connected to negative supply
    • Material: White Polycarbonate
    • Alarm indicator: Integral indicator with 360° visibility
    • Dimensions (D x H mm): 100 x 42 mm
    • Weight: 70g
    • Operating and Storage Temperature: -40°C to +70°C
      • Operating temperature is restricted by the intrinsic safety gas
      • classification:
      • Class T5: -40°C to +40°C
      • Class T4: -40°C to +60°C
      • The detector must be protected from conditions of condensation or icing
    • Humidity: 0% to 98% relative humidity (no condensation)
    • Wind Speed: Unaffected by wind
    • Atmospheric Pressure: Insensitive to pressure
    • IP Rating to EN 6052:1992: 23D
    • Electromagnetic Compatibility:
    • Emissions: BS EN61000-6-3
    • Susceptibility: BS EN50130-4

    Choosing a Heat Detector

    Choosing a heat Detector


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