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Product Features
  • Ex. Rating: EEx ib IIB T1
  • Provides measurements of 6 gases
  • Measures flow rate, atmospheric, static, and differential pressures
  • SiteMan PC software included
Delivery options

At Cadmus Products we aim to deliver orders efficiently and at highly competitive rates. 

  • We can ship consignments of all shapes and sizes and hazardous content across the UK and worldwide. Most of our orders are sent via DHL, however sometimes we may use other couriers.
  • If you are purchasing a laboratory product online you can find out the price of shipping checkout. If you are obtaining a quote for a product, then we will email you
    with our best shipping prices along with your quote.
  • Please see our delivery page for full information

The GFM436 is an ATEX certified gas analyser for site investigation, landfill gas control, and environmental regulation compliance monitoring.

It is a fixed configuration, measuring the proportions of CH4 (by both volume and Lower Explosive Limit), CO2, O2, H2S and CO presented in soil gas, greenfield and brownfield sites. This includes land affected by landfill operations or other industrial contamination.

Additionally, hexane content is measured to assist in areas with hydrocarbon vapours from spilt fuels, oils, or other such contaminants. This instrument has the additional capacity to measure gas pressure (differential and static) and flow rate (instantaneous and peak).

Optional extras to measure velocity and temperature are available.

GFM436 Key Features

  • Small and portable – easily fits in one hand
  • High-contrast LCD display
  • User-swappable battery pack
  • Battery life ranging from 8 to 12 hours and 4 hours charging time
  • Charger suited to your country
  • Protective weather-proof leather case
  • Supplied in a ready-to-go site kit
  • Factory-calibrated infrared sensor for measuring Hexane vapour
  • Detector (PID) correction factor for low levels of Volatile Organic Compounds (VOC)
  • Bi-directional measurement of instantaneous and peak borehole flow
  • Storage of 2 water level readings from DIP meter taken at each borehole
  • Manual and unattended data-logger with USB download

All GFM instruments require annual service and recalibration and service.


  • Site investigation
  • Borehole monitoring
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