LI-7810 CH4/CO2/H2O Trace Gas Analyzer

The LI-7810 CH4/CO2/H2O Trace Gas Analyzer offers high performance methane measurements in a durable, portable design. This makes the LI-7810 a great fit for survey or long-term measurements of soil CH4 fluxes.

A combination of several patented technologies with Optical Feedback-Cavity Enhanced Absorption Spectroscopy (OF-CEAS) results in precise and stable CH4 measurements, allowing for extensive use without the need for frequent calibration.

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LI-7810 Advantages

  • Connect to the Smart Chamber or the LI-8250 Multiplexer for real-time soil CH4 and CO2 flux data.
  • Benchtop precision combined with a portable, weather resistant design—no elaborate field structures needed.
  • Battery operated with hot-swappable batteries that last 8 hours.
  • Low power requirements: 22 W during steady state operation and up to 90 W during warmup.

For details on the design and technology used in the LI-7810, visit the Trace Gas Analyzers page.

LI-7810 Trace Gas Analyzer

Specifications

General

  • Measurement Technique: OF-CEAS (Optical Feedback-Cavity Enhanced Absorption Spectroscopy)
  • Measurement Rate: 1 sample per second (1 Hz)
  • Optical Cavity Volume: 6.41 cm3
  • Flow Rate: 250 sccm (nominally)
  • Total Weight: 10.5 kg (including batteries)
  • Case Dimensions: 51 cm L x 33 cm W x 18 cm H
  • Operating Temperature Range: –25 °C to 45 °C (without solar load, under normal operating conditions)
  • Operating Humidity Range: 0 to 85% RH (non-condensing, without solar load, under normal operating conditions)
  • Sample Line Humidity Range: 0 to 99.9% non-condensing
  • Operating Pressure Range: 70 to 110 kPa
  • Connectivity: Ethernet, Wi-Fi (not available in some countries)
  • Wi-Fi Compatibility: 2.4 GHz, 802.11 a/b/g/n/ac
  • Power Consumption:
    • Steady State Operation: 22 W at 25 °C
    • Warmup (10.5 to 33 VDC power supply, pins 3 and 4): Up to 90 W
    • Warmup (Universal power supply or 24 VDC power supply, pins 1 and 5): Up to 140 W with batteries charging
  • Power Supply: Universal Power Adapter (Input: 100 to 240 VAC, 50-60 Hz; Output: 24 VDC)
  • Battery Life: 8 hours typical with 2 batteries

CH4/CO2/H2O Measurements

  • Response Time (T10-T90): CH4 ≤ 2 seconds, 0 to 2 ppm

CH4 Measurements

  • Measurement Range: 0.1 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

CO2 Measurements

  • Measurement Range: 1 to 10,000 ppm
  • Precision (1σ):
    • 3.5 ppm at 400 ppm with 1 second averaging
    • 1.5 ppm at 400 ppm with 5 second averaging

H2O Measurements

  • Measurement Range: 100 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

Specifications subject to change without notice.

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