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CO2 Isotope/NH₃ Trace Gas Analyzer
CO2 Isotope/NH₃ Trace Gas Analyzer - Image 2
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CO₂ Isotope/NH₃ Trace Gas Analyzer

Model : LI-7825

The LI-7825 CO2 Isotope/NH3 Trace Gas Analyzer is a high-precision, high-stability, laser-based gas analyzer that uses Optical Feedback — Cavity-Enhanced Absorption Spectroscopy (OF-CEAS) to measure gases in air. OF-CEAS is a well-established spectroscopic technique that is described in published literature. The analyzer reports and stores in its internal memory the CO₂, H₂O, and , and NH₃ concentration, as well as proportions of δ13C, δ17O, and δ18O (dry mole fractions in air) corrected for both the spectroscopic interferences and dilution due to H₂O.

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

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Benefits

This compact, field- or lab-ready solution takes your work to the next level.

MOBILE MEASUREMENTS

Obtain leaf-level trace gas flux and carbon isotope data in the field, greenhouse, or lab. You can now collect precise, in-situ measurements without elaborate infrastructure.

INTEGRATED SOLUTION

Integrate the LI-6800‘s proven gas-exchange platform with the precision and long-term stability of LI-COR Trace Gas Analyzers. Together, they help you collect accurate, reliable, and fully integrated data.

COMPACT & EASY TO USE

Collect measurements where your plants are with the small footprint and the LI-6800‘s familiar, intuitive operating process—no large, complex, or experimental setups required.

DEEPER PLANT INSIGHTS

Get mesophyll conductance data and the parameters for calculating bundle sheath leakiness—key variables that inform efforts to improve photosynthetic carbon and water use efficiency.

Web-enabled for convenience

• Wi-Fi and a built-in web server with software make connecting to a computer, smart phone, or tablet effortless.

• Software is designed for quick access to measurement data, status information, and configuration options.

• Built-in storage holds two months of data.

• Support for direct connection to a PC or Ethernet-compatible datalogger expands data storage options.

 

Specifications

Specifications

CO₂ Measurements

Response Time (T₁₀-T₉₀): ≤ 2 seconds from 0-400 ppm

Range: 50 to 2,000 ppm

Precision (1σ):
0.05 ppm at 400 ppm with 5-minute averaging

Maximum Drift: < 0.5 ppm per 24-hour period

δ13C Measurements

Precision (1σ):
<0.5 ‰ at 400 ppm CO₂ with 1 second averaging
0.04 ‰ at 400 ppm CO₂ with 5-minute averaging

Maximum Drift: <1 ‰ per 24-hr period

δ18O Measurements

Precision (1σ):
0.1 ‰ at 400 ppm CO₂ with 5-minute averaging

Maximum Drift: <4 ‰ per 24-hr period

δ17O Measurements

Precision (1σ):
0.4 ‰ at 400 ppm CO₂ with 5-minute averaging

Maximum Drift: <12 ‰ per 24-hr period

NH₃ Measurements

Range: 0-30,000 ppb

Precision (1σ):
2 ppb at 300 ppb with 1 second averaging

Response Time (T₁₀-T₉₀): ~5 minutes *

H₂O Measurements

Range: 0 to 60,000 ppm

Precision (1σ):
45 ppm at 10,000 ppm with 1 second averaging
20 ppm at 10,000 ppm with 5 second averaging

*NH₃ measurement response time is dependent upon gas composition and inlet pneumatic configuration including tubing/fitting materials, flow rates, and upstream volumes.

Specifications subject to change without notice

 

Applications

Applications

Applications The LI-7810 is ideal for a range of applications—from atmospheric CH4 monitoring to mobile monitoring, to soil CH4 and CO2 flux measurements. It easily connects to the Smart Chamber or LI-8250 Multiplexer for survey or long-term soil CH4 /CO2 gas flux measurements.

  • Atmospheric monitoring
  • Soil gas flux measurements
  • Mobile measurement systems
  • Wetland and lake emissions
  • Small volume injections
  • Sampling from flasks
  • Urban emissions monitoring
  • pCH4 measurement systems
  • Sensor networks
  • Large area emissions monitoring
  • Fugitive emissions detection
  • High altitude sites

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