IR15TT-Dual Gas Infrared Sensor

SGX infrared sensors make use of the verified Non-Dispersive Infrared (NDIR) principle to identify and track the presence of gases. Specific gases of varieties of gas can be detected, and their concentration levels analyzed, using an infrared source with specific filtering on the pyroelectric detectors attached to the inner part of the optical/gas cavity.

These sensors are appropriate for consistent tracking of gas levels in general safety uses where the sensor is of a limited size and has need of a fire-retardant enclosure for hazardous environments.

Models in the IR15 Series have a pair of active detector elements for concurrent monitoring of Carbon Dioxide and Methane or Hydrocarbon blends. This makes them a more budget-friendly option than two individual sensors and saves on space as this dual option comes within housing of the same size as a number of the single gas sensors from the IR1xxx series.

The sensor has applications in a wide variety of fields including utilities, steelworks, bio-gas, petrochemical, oil and gas, wastewater, indoor air quality, and confined space entry.


  • Boasts a study, 19 mm tall, stainless steel build with no moving parts
  • Features a special gold-plated optical gas cavity, designed to offer stable signal levels
  • Offers a fast response combined with low power usage
  • Able to operate in a variety of temperature, pressure and humidity conditions
  • Has immunity from ‘poisoning’
  • Able to detect Carbon Dioxide & Hydrocarbons as well as Hydrocarbon Mixtures
  • Gas concentration ranges of:
    • 0-5% Carbon Dioxide (also suitable to 0 to 0.5% v/v)
    • 0-100% Carbon Dioxide (also suitable for 0-10%
    • 0-100% Hydrocarbons (also suitable for 0-100% LEL)
  • Offers an embedded thermistor for better temperature compensation
  • Offers diffused gas sampling via mesh
  • Has a reference channel for self-compensation
  • Offers dependable, fail-safe use, certified by ATEX, IECEx, CSA and UL


To make effective use of this device, it is necessary for the sensors to be interfaced to an appropriate circuit to provide power supply, signal processing and amplification. In order for sensors to hit their full performance levels, as per specification, sensor outputs need linearization and compensation for ambient temperature variance, utilizing algorithms within the system firmware.

On certain types, this compensation is enabled through an embedded temperature sensor, but so long as there is suitable input from a pressure sensor, further compensation for pressure variation can also be produced in an algorithm.

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