H2O Water Vapor Isotope Analyser (Model WVIA)

Reliable in-situ measurements of δ2H, δ17O, and δ18O in water contained in liquids, vapor, fog and clouds are important in modeling vapor dynamics and determining potential feedback on future climate change. In addition, fast, high-frequency isotopic water measurements provide detailed time-resolved information on the eco-physiological performance of plants and enable improved understanding of water fluxes and evapo-transpiration at ecosystem scales. These applications require rapid measurements with high accuracy and precision over a wide range of water-vapor mole fractions.

LGR’s Water Vapor Isotope Analyser uniquely meets all of these requirements. In addition, the WVIA may be combined with LGR’s Water Vapor Isotope Standard Source (WVISS), which provides a controllable reference flow of isotopic water vapor standards. The system composed of the WVIA and WVISS provides automated, dual-inlet operation and accurate, traceable δ2H, δ17O, δ18O and water vapor mole fraction measurements without drift.

Features and Benefits

  • Only instrument to report δ2H, δ17O, δ18O and H2O simultaneously
  • Automated dual-inlet operation provides unsurpassed accuracy, precision, and ease of use
  • Highest precision, reliable measurements at 2 Hz
  • High-resolution absorption spectra provide data validation and detailed system diagnostics
  • Wide range of mole fractions: up to 60000 ppm H2O in air
  • Accurate measurements over an extremely wide range of mixing ratios and isotopic ratios
  • Proven fast flow time response allows isotopic flux studies
  • Enhanced Performance models provide measurements with negligible drift
  • Insensitive to other ambient air constituents like methane or carbon dioxide

Available as in the following configurations:

  • GLA132-WVIA - Ultraportable 
  • GLA331-TWVIA - Rackmount Enhanced Performance

Please choose which specification you require information about

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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