O2 / CO2 Oxygen & Carbon Dioxide Analyser - Trace Gas

LGR’s O2/CO2 Analyser is the first instrument capable of reporting oxygen, carbon dioxide and water vapor in air with extremely high precision and fast response. Designed for measurements in ambient air for applications requiring high precision, the O2/CO2 Analyser applies LGR’s proven cavity enhanced laser absorption spectroscopy technique for simultaneous continuous measurements of these three important atmospheric gases.

The O2/CO2 Analyser is simple to use, low power and rugged which makes it ideal for field  studies. The ability to measure O2 and CO2 at the same time simplifies the analysis of air  samples. In addition, analysis of the measured absorption spectra allows the instrument to accurately correct for water vapor dilution and absorption line broadening effects and thus to report CO2 and O2 on a dry mole fraction basis directly without drying or post processing.  Furthermore, LGR’s new “Extended Range” option provides accurate CO2 measurements up to 10% mole fraction without reducing precision and sensitivity at typical ambient levels - a unique LGR capability.

Features and Benefits

  • Developed for applications requiring highest accuracy
  • All gases measured simultaneously
  • Measured spectra always viewable
  • O2 and CO2 reported on dry mole fraction basis directly
  • Ideal for ambient air and chamber flux studies
  • Wide measurement range
  • Extended Range option allows
  • CO2 measurements to 10%
  • Remote access simplifies field measurements

All LGR Analysers now come with a 2 Year Warranty as standard, underlying the quality and robustness of their manufacture and high reliability. Warranties can also be extended to 3 or 4 years at additional cost, at the time of purchase. Please enquire for further details.

Under normal operation and for the vast majority of applications, LGR Off-axis ICOS gas analysers require the minimum of servicing and maintenance.

One of the many benefits of this technology is long-term unattended reliability in the field.

LGR Advantages

Annual maintenance would normally include an inspection of the internal pump (or external pump if fitted) and the replacement of the pump diaphragm and valve seals if necessary.

This can be carried out by the user themselves or by ET either on site or back in the ET workshop (for a maintenance quote, please contact us).

ET recommends that LGR Analyser users consider the purchase of a field maintenance kit which includes:

  • Replacement solid-state hard-drive with LGR operating system and specific system files pre-loaded, for quick and simple swap-out in the field if ever necessary.
  • Pump maintenance kit (internal) to include spare pump diaphragm and valve seals.
  • Mirror cleaning kit.


Please contact us if you would like to receive a quote for the field maintenance kit.

Additional maintenance will be required for the LGR Liquid Water Isotope Analyser (LWIA) and Auto-injector unit and also the LGR Dissolved Gas Extraction Unit (DGEU).

For these instruments, please refer to the operation manual supplied with these instruments.

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