Built for eddy covariance, the LI-7200RS Enclosed C0₂/H₂O Analyzer delivers high-speed C0₂ and water vapor measurements with the ruggedness you need for long-term deployments—helping you capture continuous, complete data sets.
Take continuous measurements through rain, snow, and fog for minimal gaps in the data.
Get long-term stability and less drift with improved optics and temperature controls.
Measure temperature and pressure of sampled air at high speeds—in sync with gases.
Compute dry C0₂ and H₂O mole fractions at speeds up to 20 measurements per second.

KEY FEATURES

Stable Measurements

Get stable data even when temperatures at your site fluctuate widely, thanks to temperature-controlled source and detector.

The Complete Picture

Add a 3D sonic anemometer for wind measurements and collect meteorological, radiation, and soil data with LI-COR Biomet System sensors.

Built for Rough Sites

Rely on field-ready optics that resist dust and wear with scratch-resistant windows that maintain data quality in tough conditions.

Effortless Integration

LI-7200RS-based eddy covariance systems gain access to LI-COR Cloud^® and its next-generation data processing and analysis tools.

Proven Performance:

The Global Standard in Eddy Covariance

See how the LI-7200RS performs over time. These figures illustrate optical filters and drift resistance in real-world conditions—delivering long-term, accurate, and dependable data.

Figure 1. Water vapor measurements from two unfiltered LI-7200RS instruments and two unfiltered LI-7200 analyzers (average and spread). The y-axis shows deviation from a control reference. Measurements from the LI-7200RS analyzers drifted several times less and have smaller instrument-to-instrument variability than those from the original LI-7200.

Click the image to view interactive data (warning: may slow down your browser)

Figure 2. The LI-7200RS measures the sample air temperature and pressure with every gas density measurement. Dampened, low-speed temperature measurements of block temperature will not provide the data required to compute fast mole fractions.

Click the image to view interactive data (warning: may slow down your browser)

Figure 3. Errors from slow, dampened temperature and pressure measurements, rather than fast measurements of sampled air, accumulate quickly, and become significant after a few days of data collection at this site. By day 10, fluxes were underestimated by 2.4 times.

Next-Gen Data Analysis

Bring your system online. Each LI-COR eddy covariance system is equipped with SmartFlux^® Core, the on-site hardware that sends data to LI-COR Cloud.

Explore

Remote access

View, share, and download CO₂ and H₂O data from your lab or collaborating sites anywhere in the world.

Shareable data

Allow other researchers to conveniently access your data—even if they do not own a LI-COR device themselves.

Tailored data analytics

Access detailed analytics built from your LI-7200RS's data streams within LI-COR Cloud.

Easy configuration

Follow a straightforward, guided configuration that anyone on your team can do—no technical expertise required.

Specifications

CO₂ Measurements

Calibration Range: 0 to 3000 µmol mol^-1
Accuracy: Within 1% of reading
Zero Drift (per °C):
- ±0.1 ppm typical
- ±0.3 ppm maximum
RMS Noise (typical @ 370 ppm CO₂ and 10 mmol mol^-1 H₂O):
- @5 Hz: 0.08 ppm
- @10 Hz: 0.11 ppm
- @20 Hz: 0.16 ppm
Gain Drift (% of reading per °C @ 370 ppm):
- ±0.02% typical
- ±0.1% maximum
Direct Sensitivity to H₂O (mol CO₂/mol H₂O):
- ±2.00E-05 typical
- ±4.00E-05 maximum

H₂O Measurements

Calibration Range: 0 to 60 mmol mol^-1
Accuracy: Within 2% of reading
Zero Drift (per °C):
- ±0.03 mmol mol^-1 typical
- ±0.05 mmol mol^-1 maximum
RMS Noise (typical @ 370 ppm CO₂ and 10 mmol mol^-1 H₂O):
- @5 Hz: 0.0034 mmol mol^-1
- @10 Hz: 0.0047 mmol mol^-1
- @20 Hz: 0.0067 mmol mol^-1
Gain Drift(% of reading per °C @ 20 mmol mol^-1):
- ±0.15% typical
- ±0.30% maximum
Direct Sensitivity to CO₂ (mol H₂O/mol CO₂):
- ±0.02 typical
- ±0.05 maximum

General

Analysis Type: Absolute, non-dispersive infrared spectroscopy
Data Storage: 16 GB removable industrial grade USB storage device
Data Communication: Ethernet, Synchronous Devices for Measurement (SDM; >50 Hz), 6 DACs (0-5 V; 300 Hz)
Inputs: Four analog input channels (differential; bi-polar; ±5 V; 300 Hz)
Operating Temperature Range: -25 to 50 °C (-40 to 50 °C verification test available on request)
Power Requirements: 10.5 to 30 volts DC
Power Consumption: 12 W nominal (up to 30 W during startup)
Detector: Thermoelectrically cooled lead selenide
Bandwidth: 5, 10, or 20 Hz, user-selectable
User Interface: Windows® based
Cable length: 5 meters (all cables); 5-meter head cable extension available

Analyzer Head

Size: 7.5 cm (36” diameter), 31 cm (12.2”) length
Weight: 1.8 kg (3.95 lbs.)

LI-7550 Analyzer Interface Unit

Size: 35 cm x 30 cm x 15 cm (13.8” x 12” x 6”)
Weight: 4.4 kg (10 lbs)

7200-101 Flow Module

Operating Temperature Range: -25 to +50 °C
Power Requirements: 10.5 to 30 VDC
Power Consumption: < 16 W nominal
Flow Rate: 15 LPM nominal
Size: 35 cm x 30 cm x 15 cm (13.8” x 12” x 6”)
Weight: 6.15 kg (13.55 lbs)

Insulated Intake Tube

Length: Up to 1 meter
Inside Diameter: 5.33 mm
Outside Diameter: 6.35 mm

Heated Intake Tube

Length: 71.1 cm
Inside Diameter: 5.33 mm
Outside Diameter: 6.35 mm
Operating Temperature Range: -40 to 50 °C
Output Wattage: 0.1 to 6 W
Heat Density Ratio (short tube to long tube): 2:1
Weight: 0.54 kg (1.2 lbs)

7550-101 Auxiliary Sensor Interface

Size: 11.5 cm x 6.5 cm x 4.2 cm (4.5” x 2.6” x 1.7”)
Weight: 0.39 kg (0.85 lbs) including mounting bracket

Specifications subject to change without notice.

LI-7200RS Enclosed C0₂/H₂O Analyzer

Fast closed path C0₂/H₂O measurements across all weather conditions