The GFM 436 by Gas Data is an ATEX accredited instrument for landfill gas control and site investigation.

This instrument measures the proportions of CH4 (by both volume and Lower Explosive Limit), CO2, O2, H2S and CO presented in soil gas, greenfield and brownfield sites.

Hexane content is measured to assist in areas with hydrocarbon vapours from spilt fuels, oils, or other such contaminants. The GFM 436 can also measure gas pressure (differential and static) and flow rate (instantaneous and peak).

An optional temperature sensor can be plugged in for gas temperature measurements or, alternatively, a vane anemometer can be attached to measure the velocity in a gas extraction system.

  • Intrinsically safe and ATEX certified
  • Provides measurements of 6 gases – CH4, CO2, O2, H2S, CO and Hexane
  • Measure of atmospheric, flow rate, static and differential pressures
  • Small portable design that is easy to hold in one hand
  • Optional water level data entry with 2 meter readings can be stored for each borehole location
  • SiteMan PC software
  • High contrast LCD display
  • User swappable battery pack
  • Battery life ranging from 8-12 hours
  • Maximum charging time of 4 hours
  • Charger suited to your country
  • Protective weather-proof leather case
  • Supplied in ready-to-go site kit
  • Annual recalibration interval


Landfill sites

Recycling plants



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