LI-870 CO2/H2O Analyzer

The LI-870 CO2/H2O Analyzer is a versatile analyzer for publication quality data that is simple to deploy, use, and maintain. A combination of precision and stability alongside a rugged and fieldable design makes it ideal for survey and long-term research focused on fluxes of soil CO2.

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LI-870 Advantages

The LI-870 delivers rapid CO2 flux measurements with great precision while being light enough (2.31 kg) to carry all day without wearing you out. The LI-870 maintains that same speed and precision even when tasked with making long-term measurements in harsh conditions.

The LI-870 has low power requirements (5W average with pump after warmup) and is powered by the Smart Chamber for survey measurements or the LI-8250 Multiplexer in a long-term system. The weatherproof case houses the weather, dust, and splash resistant components with a user-serviceable optical bench that does not require factory recalibration.

LI-870 Analyzer



  • Dimensions: 28.4 cm L × 27.9 cm W × 12.4 cm H
  • Weight: 2.31 kg
  • Measurement Rate: 1 measurement per second (1 Hz)
  • Operating Range:
    • Temperature: –20 to 45 °C, without solar loading
    • Humidity: 0 to 95% RH, non-condensing
    • Pressure: 50 to 110 kPa
  • Measurement Principle: Non-dispersive infrared (NDIR)
  • Flow Rate (nominal): 0.75 liters min-1


  • Input Voltage: 10 to 17 VDC, 2 A max
  • Power Source: 8200-01S Smart Chamber or LI-8250 Multiplexer
  • Power Consumption:
    • After Warmup (without pump): 0.33 A @ 12 VDC (4.0 W) average
    • After Warmup (with pump): 0.42 A @ 12 VDC (5.0 W) average

CO2 Measurements

  • Measurement Range: 0 to 20,000 ppm
  • Accuracy: Within 1.5% of reading

H2O Measurements

  • Measurement Range: 0 to 60 mmol mol-1
  • Accuracy: Better than 1.5% of reading

Specifications subject to change without notice.

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