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CO2 Isotope Analyzer

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LI-7815 CO2/H2O Trace Gas Analyzer

Precise, stable CO2 isotope measurements

The LI-7825 CO2 Isotope Analyzer measures the four most abundant CO2 gas isotopologues in air and reports δ13C , δ17O , and δ18O with high precision and accuracy. By measuring CO2 isotopologues and calculating isotope ratios, researchers can:

  • Identify the sources and sinks of atmospheric carbon
  • Partition net ecosystem carbon exchange
  • Gain insight into biological processes
  • Evaluate carbon sequestration efforts
  • Backed by over thirty-five years of experience in gas analysis technology, the LI-7825 joins the LI-COR Trace Gas Analyzers trusted by researchers and networks around the world.

Dependable, accurate, portable, and affordable

The LI-7825 features the same rugged design, portability, accuracy, and precision as other LI-COR Trace Gas Analyzers at an affordable price. Suitable for both the bench and the field, it is easily added to an existing instrument rack. It can integrate into established systems and delivers dependable data to allow researchers to ask and answer new questions with confidence.

Key specifications


  • Total Weight: 10.5 kg (including batteries)
  • Battery Life: 8 hours typical with 2 batteries

Preliminary Specifications

  • CO2 Measurement Range: 50 to 2,000 ppm
  • δ13C Precision (1σ): <0.3 ‰ with 1 second averaging at 400 ppm CO2
  • δ13C Drift: <1 ‰ 24 hours, peak-to-peak 1 hr interval average


  • Atmospheric monitoring
  • Urban emissions monitoring
  • Mobile emissions monitoring
  • Large area emissions monitoring
  • Sensor networks
  • Mud logging

More applications information—including leaf level and soil—coming soon.

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