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International Gas Detectors (IGD) is a UK based company specialising in gas detection instruments, gas safety, and gas analysis. IGD have been leaders in gas detection technology for over 95 years and their gas safety products and gas monitoring equipment are found worldwide.

Formally known as Richard Oliver Ltd and Oliver IGD Ltd, the Company changed its name to International Gas Detectors Ltd to embrace its former division.

For all gas detection, gas analysis, or gas monitoring needs, International Gas Detectors Ltd offers a wide and versatile product range. All our gas monitoring equipment and gas safety products are manufactured in the UK.

IGD offers the following range of products:

Detector Control Panels
  • Tocsin 625 Control Panel (Wall Mount)
  • Tocsin 700 Series Control Panel (Wall Mount)
  • Tocsin 903 EExd Control Panel (Wall Mount)
  • Tocsin 920 Addressable Control Panel (Wall/Rack Mount)

Gas Detectors

  • Tocsin 103 Series Gas Detectors (Safe Area)
  • Tocsin 102 Series Gas Detectors (Hazardous Area, ATEX Certified)
  • TOC-31A Flammable Gas Detector (Safe Area)
  • MK III Flammable Gas Detector (Hazardous Area)

Series Gas Detector

Tocsin 103

Series Gas Detector


The Tocsin 103 series of gas detectors are designed for cost effective safe area gas detection solutions. They incorporate micro processor technology to give a stable 4-20mA process signal output or digital addressable output. The addressable output option allows detectors to be networked on a single cable run giving dramatic reduction in installation costs. 

The in built processor can be used to pre-calibrate the sensor prior to installation. Alternatively calibration can be achieved on site via the IGD control panel or locally using a handheld PC device or laptop. A range of sensing technologies can be incorporated into the housing to provide the most appropriate detection method.

Available sensor types include: 

  • IGD’s own MKIII and Type B Pellistors

  • Infra Red

  • Electrochemical Devices



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