Orbis Intrinsically Safe (IS) Heat Detector

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  • Price:
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    • In Stock - 2-3 days delivery
  • ORB-HT-51145-APO

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

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