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New LI-830 CO2 and LI-850 CO2/H2O Analyzers for Continuous Measurements

Great Results. No Hassle.

High-performance monitoring solutions that give accurate, stable readings. Easy-to-use software and minimal maintenance provide hassle-free measurements for a wide range of applications and system integration options.

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Easy Operation.

plugging in the LI-830

Just plug it in and you’re ready to go

With the new optional pump and display, just power the instrument on, and measurements appear immediately. View real-time measurements, configure graphs, or set up logging options with the easy-to-use software.

Minimal maintenance interior picture

Keep it simple with minimal maintenance

Ensure continuous operation and minimize downtime with a user-cleanable optical bench, and no need for factory recalibration.

software screenshot

Easily view or log measurements

Windows® and Mac® interface software display real-time concentrations and graphs. Easily set up operational parameters and logging options, and view analyzer diagnostics.

Flexible to Fit Your Needs.

Multiple configuration options provide you the flexibility to select the analyzer that’s right for you, without compromise.

CO2 + H2O

Add water vapor measurements to the standard CO2 measurement (0-20,000 ppm) for expanded applications and increased measurement accuracy.

Internal Pump

An integrated pump provides a constant air flow rate. Or, choose a basic analyzer configuration and incorporate your own pump.

Analyzer Display

Add a display to view real-time gas concentrations, and pressure and temperature readings.

LI-850 outside and inside

Designed for Your Application.

Flexible configurations and outputs for a variety of applications.

Growth Chambers and Greenhouses

Analyzers can be configured to monitor CO2/H2O and trigger fans or injection of CO2 and/or H2O, keeping levels within a desired range. User-supplied relays can also trigger devices such as pumps, valves, dialers, or audible alarms.

Atmospheric Monitoring

Analyzers have the stability and durability to continuously monitor atmospheric CO2 and H2O. The included software facilitates configuration, control, data collection, and graphical data display.

Other common applications include:

  • Measuring pCO2 and DIC
  • Indoor air quality monitoring
  • Building system efficiency (ventilation systems)
  • Process control
  • Bioremediation
  • Atmospheric profiling
  • Leakage monitoring
  • TOC analysis systems
  • Volcanology

Advanced Technology for Excellent Performance.

Optical Bench

air flow animation


Careful design of thermostatically controlled IR detection system gives you excellent stability.


Integrated thermistors and a pressure transducer provide high accuracy for the concentration calculation over the entire measurement range.

Reduced variability

A pressure transducer within the gas flow path compensates, and corrects for, changes in barometric pressure.


A foam enclosure surrounding the optical path maintains a controlled thermal environment and protects the bench from mechanical shock and vibration.

Output What’s Right for You.

  • Analog and digital outputs
    • Two current (4-20 mA) and two voltage (0-2.5V or 0-5V)
    • Digital TTL (0-5V) or Open Collector
  • XML communications
  • Windows and Mac software, via USB or RS-232

The Analyzer You Trust – Now Even Better, at a Lower Cost.

We’ve improved upon our proven platform, to bring you better analyzers with the performance and reliability you’ve come to trust.

In addition to expanded configuration options, the new LI-830 CO2 and LI-850 CO2/H2O Analyzers also feature a longer lasting source - further minimizing any field maintenance needed, with lower power requirements.

LI-830 and LI-850 product photos


CO2 measurements

  • Measurement range: 0-20,000 ppm
  • Accuracy
    • LI-850 Within 1.5% of reading
    • LI-83O Within 3% of reading
  • Calibration Drift
    • Zero Drift1: <0.15 ppm/°C
    • Span Drift2: <0.03%/°C
    • Total Drift at 370 ppm3: <0.4 ppm/°C
  • RMS noise at 370 ppm with 1 sec signal filtering: <1 ppm
  • Sensitivity to water vapor (LI-850 only): <0.1 ppm CO2/mmol mol-1 H2O
  • Lower limit of detection 1.5 ppm

H2O Measurements (LI-850 only)

  • Measurement range: 0-60 mmol mol-1
  • Accuracy: Better than 1.5% of reading
  • Calibration drift
    • Drift at 0 mmol mol-1: <0.003 mmol mol-1/°C
    • Span drift at 10 mmol mol-1: <0.03% mmol mol-1/°C
    • Total drift at 10 mmol mol-1: <0.009 mmol mol-1/°C
  • RMS noise at 10 mmol mol with 1 sec signal filtering: <0.01 mmol mol-1
  • Sensitivity to CO2: <0.0001 mmol mol-1 H2O/ppm CO2

Pump (optional)

  • Operating temperature range: 5 to 45 °C
  • Storage temperature range: -20 to 60 °C
  • Operating humidity range: 0 to 80% RH
  • Nominal flow rate: 0.75 liters minute-1
  • Power consumption: <0.75 W
  • Expected life span: 8,000 hrs in standard conditions with a normal load

Display (optional)

  • Dimensions: 6.7 cm corner-to-corner
  • Resolution: 400 x 200 px; monochrome
  • Power consumption: <200 µW
  • Displayed variables: CO2 reading, H2O reading (LI-850 only), optical bench temperature, and pressure.


  • Output rate: Up to 2 measurements per sec
  • Response time (T90):
    • CO2: <3.5 seconds from 0-375 ppm
    • H2O: <3.5 seconds from 0-21 ppm mmol mol-1
  • Measurement principle: Non-Dispersive Infrared
  • Traceability:
    • CO2: Traceable gases to WMO standards from 0-3,000 ppm; traceable gases to EPA protocol gases from 3,000-20,000 ppm
    • H2O (LI-850 only): NIST traceable LI-610 Portable Dew Point Generator
  • Pressure compensation range: 50-110 kPa
  • Maximum gas flow rate: 1 liter min-1
  • Output signals: Two analog voltage (0-2.5 V or 0-5 V) and two current (4-20 mA)
  • Digital outputs: TTL (0-5V) or Open Collector
  • DAC resolution: 16-bits across user specified range
  • Power Requirements:
    • Input voltage: 12-30 VDC
    • After warmup (without pump): 0.3 A @ 12 VDC (3.6 W) average
    • After warmup (with pump): 0.4 A @ 12 VDC (4.6 W) average
    • During warmup: 1.2 A @ 12 VDC (14 W) maximum
  • Operating temperature range: -20°C to 45°C
  • Relative humidity range: 0 to 95% RH, Non-condensing
  • Dimensions: 22.23 x 15.25 x 7.62 cm (8.75” x 6” x 3”)
  • Weight:
    • No pump, no display: 1.0 kg
    • No pump, with display: 1.02 kg
    • With pump, no display: 1.3 kg
    • With pump, with display: 1.32 kg
  • Internal optical cell volume: 14.5 mL
  1. Zero drift is the change with temperature at 0 concentration.
  2. Span drift is the residual error after re-zeroing following a temperature change.
  3. Total drift is the change with temperature without re-zeroing or re-spanning.

Specifications subject to change without notice.

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