LI-COR LI-7810 Trace Gas Analyzers for CH4/CO2/H2O

Trace Gas Analyzers

LI-7810

When methane matters most
The LI-COR LI-7810 CH₄/CO₂/H₂O Trace Gas Analyzer provides exceptionally stable and precise methane measurements in a design that is both surprisingly portable and affordable. CH₄ measurements drift less than 1 ppb per 24-hour period with 0.25 ppb precision (1σ, with 5-second averaging) at 2000 ppb CH₄ in dry air at STP.
Achieve the long-term stability and precision needed for atmospheric monitoring, with the flexibility of design for deployments in mobile monitoring or soil flux research.

When methane matters most

The LI-COR LI-7810 CH₄/CO₂/H₂O Trace Gas Analyzer provides exceptionally stable and precise methane measurements in a design that is both surprisingly portable and affordable. CH₄ measurements drift less than 1 ppb per 24-hour period with 0.25 ppb precision (1σ, with 5-second averaging) at 2000 ppb CH₄ in dry air at STP.

Achieve the long-term stability and precision needed for atmospheric monitoring, with the flexibility of design for deployments in mobile monitoring or soil flux research.

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Exceptionally stable and precise measurements

When methane matters the most, the LI-7810 provides CH₄ measurements with high precision and stability and good CO₂ and water vapor measurements.

LI-7810 Long-Term Outdoor CH₄ Stability

Figure 1. Thirty-day methane stability data from an LI-7810 CH₄/CO₂/H₂O analyzer deployed in an enclosed shelter at an outdoor monitoring site in Lincoln, Nebraska. The instrument was operated continuously over the entire time period. The analyzer measured ambient air between stability checks. During stability checks, the analyzer was flushed for 10 minutes with tank gas (2 ppm CH₄, 400 ppm CO₂ mixed in air balance, 1% nominal concentration accuracy) and a time series data set was subsequently recorded for 10 minutes every 12 hours. The figure shows the mean value of the 10-minute measurements. Error bars represent a 1σ confidence interval (68%).

LI-7810 7-Day CH₄ Precision with Allan Deviation Plot

LI-7810 7-Day CH4 Precision with Allan Deviation Plot — **Figure 2. Seven-day CH₄ stability data from an LI-7810 CH₄/CO₂/H₂O analyzer (top).** A single instrument was operated continuously over a 7-day period with a continuous flow of tank gas. The light blue line shows 1-second measurements; the dark blue line shows a 50-minute block average. Allan deviation plot (bottom) of CH₄ measurements from an LI-7810 measuring mixture of 1970.7 ppb methane and 387.5 ppm CO₂ shows precision at 1-second signal averaging, with improved precision as averaging time increases. Error bars represent 68% (±1σ) confidence intervals based on number of averaged time series available at each τ.

**Key specifications**
General
**Total Weight:** 10.5 kg (including batteries)
**Battery Life:** 8 hours typical with 2 batteries
CH₄ Measurements
**Response Time (T₁₀-T₉₀):** all from 0 to 2 ppm≤ 2 seconds in *Standard Configuration*
≤ 3 seconds in *High Altitude Configuration*
**Range:** 0 to 100 ppm
**Precision (1σ):**0.60 ppb at 2 ppm with 1 second averaging
0.25 ppb at 2 ppm with 5 second averaging
**Maximum Drift:** < 1 ppb per 24-hour period

Choosing your analyzer

The LI-7810 Trace Gas Analyzer is ideal for applications that require long-term CH₄ monitoring, or where precision and stability over time is critical. The LI-7810 is also able to provide a CO₂ measurement. The CO₂ measurements provided by the LI-7810 are appropriate for chamber-based CO₂ flux measurements, such as with the Smart Chamber. Learn more about using the LI-7810 for soil gas flux here.

For applications that demand long-term CO₂ monitoring and exceptionally precise and stable CO₂ measurements, consider the LI-7815.

The LI-7810 is not designed for eddy covariance applications—which requires higher frequency measurements, but as a closed path analyzer it can be used for pCH₄ measurements. If you need higher frequency measurements for the eddy covariance method, consider our eddy covariance solutions.

LI-COR LI-7810 Trace Gas Analyzers for CH4/CO2/H2O | For more information, contact us.

Brochure

Trace Gas Analyzers

Field guide to instruments for the earth sciences

Posters

Development of Trace Carbon Dioxide Isotopologue Analyzer – Performance Evaluation Study

Long-Term Atmospheric Monitoring of Background CH₄ and CO₂ at Mace Head Atmospheric Research Station, Ireland Using LI-COR LI-7810 and LI-7815 Trace Gas Analyzers

How do soil temperature and moisture regulate N₂O flux from an urban lawn?

Measuring Very Small Soil Fluxes of N₂O & CH₄ Using a New OF-CEAS Technology

Development of Trace Methane and Trace Carbon Dioxide Analyzers – Performance Evaluation Studies, GCWerks Integration, and Results of Field Deployment