H2O Triple Isotopic Water Analyser (Model IWA)

LGR’s Isotopic Water Analyser (model GLA431-IWA) is the only instrument for isotopic water measurements (liquid water and water vapor) capable of reporting all major isotopologues (H2O, H2HO, H2
17O, H218O) simultaneously. The IWA combines the features of LGR’s Liquid Water Isotope Analyser and Water Vapor Isotope Analyser (Enhanced Performance model) in a single instrument.

Features and Benefits

  • Comprehensive system provides unparalleled performance for both isotopic liquid water and water vapor measurements
  • Reports δ2H, δ17O, δ18O, d-excess,17O-excess (and H2O in vapor mode) in real time
  • High Throughput and High Performance modes in one system
  • Switch between liquid and vapor measurements in seconds
  • Highest precision water vapor measurements
  • Isotopic water vapor reported at high and low mole fractions
  • Fast time response allows isotopic water vapor flux studies
  • Enhanced Performance series provides unsurpassed stability and lowest drift
  • Low power: 180 W (steady state)

The “Triple” Isotopic Water Isotope Analyser (GLA431-TIWA) adds a second laser to the Off-Axis ICOS cavity, to enable measurements of δ17O and δ17O-excess, in addition to δ2H and δ18O. This enables researchers to make new, novel measurements of δ17O ratios in liquid water and water vapour, while retaining all of the features and the same form factor as the standard GLA431-IWA.

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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