Eaton MTL

MTL Instruments Group


GIR5500 - Landfill and Biogas Monitoring Analyser (Wall Mount)

Please note that this product has been discontinued. The information contained on this page is for reference use only.

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  • CH4, CO2, H2S and O2
  • ATEX Zone 2
  • Continuous monitoring
  • Robust, weatherproof design
  • Field service friendly
  • Wireless option


  • Digester gas analysis
  • Landfill gas monitoring
  • Flare stack monitoring
  • CDM verification
  • Gas to grid
  • CHP engine protection and efficiency

The GIR5500 range analysers are ideal for biogas applications. Typically, the biogas is a mixture of methane (CH4) and carbon dioxide (CO2) together with oxygen (O2) and hydrogen sulphide (H2S), which have implications for plant efficiency and safety.
Our GIR5500 range analysers are designed to provide reliable and accurate measurement of gases, helping to optimise plant productivity and improve plant availability.

Methane and carbon dioxide are both greenhouse gases (GHG), which are of environmental concern. Methane is an important fuel gas for CHP engines but if not used as fuel, then the methane is flared off to produce carbon dioxide. Therefore, the CH4 / CO2 balance can help to confirm effective anaerobic digestion. The GIR5500 uses NDIR sensor technology to measure methane and carbon dioxide. These are sensors specially designed to withstand the damp, corrosive atmosphere often found in these applications.

Oxygen is an important process indicator for both landfill and digester gas. In landfill gas, a low O2 reading can be indicative of an underground landfill fire, whilst a high reading may indicate over extraction from the site. In digester gas, a high O2 reading indicates that the process is no longer anaerobic, which may be due to a decrease in microbial activity or possibly, inward gas leaks. For effective O2 measurement, we use a special long-life electrochemical cell designed for use in the presence of acidic gases such as carbon dioxide.

Hydrogen sulphide is present in landfill and digester gas in varying amounts depending on the substrate composition. Hydrogen sulphide can be extremely corrosive to generator sets and continuous measurement can prevent costly damage. We have developed a unique system, which allows for continuous measurement of H2S whilst still achieving good sensor life at ≤ 2000ppm H2S.

One important factor in biogas analysis is the nature of the gas sample. The composition and condition of biogas can vary and often has a high level of moisture and particulates. Therefore, sample conditioning needs to be considered. The GIR5500 includes integrated particulate filters, sampling pump, sample flow indication and a low sample flow alarm as standard plus the enclosure contains a heater to help prevent condensation. An external coalescing filter is highly recommended and cooling options can also be offered to remove water.

By their very nature, biogas and landfill applications are hazardous environments. The GIR5500 range is designed for use in Zone 2 hazardous areas in accordance with Council Directive 2014/34/EU (ATEX Directive); EN 60079-0:2009 and EN 60079-15:2010.

These are hazardous area applications by their very nature. All GIR5500 versions are designed for use in Zone 2 hazardous areas according to the Industry Code of Practice ESA ICoP Edition 2, a decision endorsed by the Health & Safety Executive in the UK.

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