GFM 226

The GFM 226 is a portable carbon dioxide detector, developed for locating hiding, or trapped, people in confined spaces. It detects elevated levels of CO2, and reduced levels of O2, by analysing the air in a confined space.

Designed to be both lightweight and portable, the GFM 226 is used worldwide in security, transport, and search and rescue applications.

Specialist Gas Data probes can be attached to the instrument, allowing measurements to be taken in locations that the user cannot reach, or where there are safety concerns. The back-lit screen allows for operation in poor light conditions and the long battery life means detailed carbon dioxide monitoring can take place over an extended period.

The GFM 226 is simple to start up and easy to use. With this unit, analysis begins immediately upon deployment.


Hidden person detection


  • GFM 226
  • GFM 226


  • Small, portable design that is easy to fit in one hand
  • SiteMan PC software included
  • High-contrast LCD display
  • User-swappable battery pack
  • Battery life ranging from 8 to 12 hours
  • Maximum charging time of 4 hours
  • Charger suited to client’s country
  • Protective, weather-proof leather case
  • Supplied in ready-to-go site kit
  • Annual recalibration interval
  • Optional data-logger with USB download
  • Available instrument accessories
    • Straight needle probe
    • Under door probe
    • 1m lance probe