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PIRDUCT IR Gas Detector

Electrochemical, metal oxide semiconductor and catalytic gas detectors create a reliable first line of defence against hazardous gases.

The PIRDUCT “DuctWatch” combustible IR gas detector is specially designed to deliver reliable fixed gas detection in enclosed airhandling ductwork application




Designed for combustion turbine enclosure monitoring and similar air handling ductwork applications. The PIRDUCT is easy to install and commission, and does not require expensive extractive sampling system hardware. Providing a full scale measurement range of 0 to 15% LFL (0 to 7500 ppm) methane vapor concentration, the PIRDUCT delivers a new level of flammable hydrocarbon gas protection for high airflow environments. The PIRDUCT assembly is designed for mounting on any flat surface, and is provided pre-assembled with an aluminum mounting plate, seal gasket, and electrical termination junction box. A minimum internal duct width of 3 feet (1 meter) is required for proper installation.

  •  In-situ design improves gas response time and simplifies installation.
  • Continuous self-test automatically indicates a fault or fouled optics condition.
  •  Field calibration not required, but supported.
  • Standard 4-20 mA signal output is proportional to 0 to 15% LFL (0-7500 ppm) methane.
  •  Global approvals (FM, CSA, ATEX, CE, IECEx).


  • Performance verified in accordance with FM 6325, ANSI/ISA 12.13.04
  • SIL-2 Certification
  • Tri-Color LED provides external status indication


Allowing moving air to pass into the detection chamber for analysis of hydrocarbon vapor concentration. It is ideally suited for retrofit replacement of point detectors, and is in essence an IR beam detector delivered in a pre-aligned, ready to install package. The key advantages delivered by PIRDUCT include the ability to reliably and accurately measure gas concentration across air ductwork without the costly maintenance headache of sampling systems and expensive installation costs.The PIRDUCT is 6 times more sensitive to combustible gas than a conv​entional IR point detectors, and optimizes detection in applications where air stratification can occur.Typical applications include:

  • Gas turbine enclosures
  • Gas compressor enclosures
  • HVAC air intakes
  • Air intakes to engine compartments​

low maintenance IR technology is the heart of the DuctWatch combustible gas detector, and it has evolved from thousands of successfully installed and operating PointWatch PIR9400 IR gas detectors.



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