Soil respiration

LI-7820N2O/H2O Trace Gas Analyzer

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Imagen de: LI-7820N2O/H2O Trace Gas Analyzer

The LI-7820 N2O/H2Trace Gas Analyzer offers high-precision nitrous oxide measurements in a low power, portable design—enabling it to easily integrate into survey and long-term soil flux systems. Pair it with the LI-7810 CH4/CO2/H2Trace Gas Analyzer or LI-870 CO2/H2Analyzer for CO2 and CH4 measurements at your site.

A combination of several patented technologies with Optical Feedback-Cavity Enhanced Absorption Spectroscopy (OF-CEAS) results in precise and stable N2measurements, for chamber-based soil flux research.

LI-7820 Advantages

  • Connect to the Smart Chamber or the LI-8250 Multiplexer for collecting, processing and viewing N2fluxes on site or remotely
  • Functions with a low power, weatherized design that operates on hot-swappable, 8-hour batteries
  • Deploys long term with minimum infrastructure requirements (e.g., simple cover or stand) to create a user-friendly solution for lab and field measurements
  • Connects to a smartphone via Wi-Fi-enabled communications to monitor and view live data without a field computer and works with SoilFluxPro Software for dataset management

For details on the design and technology used in the LI-7820, visit the Trace Gas Analyzers page.

Preliminary Specifications


  • 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 100 W with batteries charging
    • Warmup (Universal power supply or 24 VDC power supply, pins 1 and 5): Up to 140 W with batteries charging
    • DC Power Source: 1.3 to 2.3 W (instrument powered off with batteries not 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

N2O Measurements

  • Measurement Range: 0 to 100 ppm
  • Response Time (T10-T90): N2O ≤ 2 seconds, 0 to 330 ppb
  • Precision (1σ):
    • 0.40 ppb at 330 ppb with 1 second averaging
    • 0.20 ppb at 330 ppb with 5 second averaging

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
Imagen de LI-7820N2O/H2O Trace Gas Analyzer

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