IR Gas Sensor with Temperature and Condensation Compensation

In most cases, when using a flammable gas detector, people choose to fit it with a catalytic bead (pellistor) or an infra-red sensor. The sensor changes the combustible gas concentration into an electrical signal that the instrument can process and react as required. Both technologies have benefits pellistors are comparatively economical and are sensitive to a broad range of flammable gases, while the infra-red sensors are very robust to environmental contamination and mechanically powerful.

However, in certain challenging applications where there are wet conditions and repeatable poisons, catalytic sensors are not well-suited and infrared sensors can develop condensation within the optical cavity when powered down, and when re-powered the condensation triggers a latched false alarm state in the infrared sensor. The choice of technology utilized has frequently relied on a compromise between reliability and cost, and infrared sensors should be built to offer superior reliability even within wet condensation applications like tunneling or mining.

INIR Infrared Sensor Range

SGX Sensortech’s INIR infrared sensor range offers both manufacturers and users of instruments with not only a completely linearized, temperature compensated output but also with extra condensation compensation. The sensor’s firmware and hardware detect the occurrence of condensation and minimize power up false alarms within wet applications and simultaneously allowing problem-free gas detection within the wet application.  Therefore, instead of sacrificing and accepting a lower performing infrared gas sensor, users are recommended to try out the SGX INIR infrared gas sensors.

Key Benefits

The key benefits offered by the SGX Sensortech’s INIR infrared gas sensors are as follows:

  • Simple usage - The SGX Sensortech INIR infrared sensors are delivered with calibrated auto ranging analog and digital temperature compensated outputs
  • Superior resistance to humidity and condensation - The sensor is equipped with unique hardware and firmware to detect and compensate for optical occlusion caused by condensation
  • Low operating power - When the INIR infrared gas sensors are operated constantly, they provide an average power consumption of less than 120 mW
  • Bus connectivity - Each sensor has a unique addressable code and when linked to a multisensory bus enables users to communicate and examine individual sensors to permit individual gas zone monitoring
  • Mechanical robustness - The INIR range uses an exclusive shock-mounted infrared source which means that it is highly resistant to mechanical shocks and vibration
  • Gas versions - Methane, propane, carbon dioxide, and butane


Whether one is a designer or a manufacturer of either stationary or portable gas detection instrumentation, the SGX Sensortech INIR infrared sensors offer a product totally capable of matching the customers’ sensing requirements. If customers are looking to build smaller instruments, increase operating run time, or lower the total cost of ownership, the SGX Sensortech INIR infrared sensors are available in industry standard package, provided with full safety certification.

Customers can contact SGX Sensortech’s sales team or the company’s network of local distributors to learn more about the groundbreaking technology included in the SGX Sensortech INIR infrared sensors as well as to see the performance of the product.

This information has been sourced, reviewed and adapted from materials provided by SGX Sensortech (IS) Ltd.

For more information on this source, please visit SGX Sensortech (IS) Ltd.


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