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Specifically designed for long-term eddy covariance measurements, the LI-7200RS combines the ruggedness of a field–ready instrument with the precision needed for flux measurements.

1

Patented system of high-speed temperature and pressure measurements of the sampled air provide true mole fraction for the most accurate flux measurements.

2

Temperature-controlled source and detector for stable measurements—even in wide temperature fluctuations.

3

Precision optical components reduce sensitivity to contamination in dusty environments.

4

Scratch-resistant sapphire lenses for simple cleaning in the field.

5

High-performance brushless chopper motor provides dependable long-term operation.

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How It Works

The LI-7200RS uses non-dispersive infrared spectroscopy to measure CO2 and water vapor densities in air. It transmits infrared radiation through temperature-controlled optical filters, then through the closed sample path to a thermally regulated lead selenide detector. Some of the infrared radiation is absorbed by CO2 and water vapor in the sample path. Gas densities are computed from the ratio of absorbed radiation to a reference.

Using a patented configuration, the analyzer also measures temperature and pressure of the sampled air at high speeds—synchronously with the gas measurements. These data are combined to compute wet and dry mole fractions at speeds up to 20 measurements per second.

Components

The following accessories are available for the LI-7200RS.

LI-7550 Analyzer Interface Unit

Included with each LI-7200RS, it houses the gas analyzer electronics, a 16 GB USB drive for data logging, and the SMARTFlux System. The LI-7750 has connections for a 3-dimensional sonic anemometer and provides Ethernet communication, making it easy to connect the LI-7200RS with FluxSuite Software.

Inlet Cap

Features an aerodynamic design that minimizes interference with wind flow to maximize frequency response, by minimizing flow distortion and dead volumes. A standard component of the LI-7200RS, the inlet cap is compatible with both the insulated intake tube and optional heated intake tube.

Particle Filter

Two 2-micron Swagelok® particle filters are included with each LI-7200RS. Compatible with both the insulated and heated intake tubes, the filter reduces the need to clean the intake tube and gas analyzer cell, improving the stability of measurements in dusty environments.

Flow Module

Efficient and durable, the Flow Module provides a precisely controlled airflow rate through the LI-7200RS optical path. With precise flow measurements and controls, it actively regulates the flow to ensure stable and consistent airflow rate.

Outputs flow rate, pressure drops, and diagnostic data to indicate when filters need to be cleaned or replaced.

Insulated Intake Tube

Included with each LI-7200RS, the insulated intake tube is ideal for measurements in dry environments with low to moderate humidity.

  • Compatible with the 2-micron particle filter.
  • Minimizes attenuation of CO2 and water vapor, while attenuating temperature by 90% to 99%.

Heated Intake Tube

The optional heated intake tube is recommended for humid environments. It improves frequency response of water vapor measurements by preventing water vapor sorption to the intake tube walls.

  • User settable control from 0 to 6 watts.
  • Compatible with the 2-micron particle filter.

Software

The LI-7200RS software simplifies eddy covariance system setup, while enabling easy access to calibration and diagnostic information for the gas analyzer.

Eddy Covariance System Capabilities

Sonic Anemometer Compatibility

The LI-7200RS can be used with any high-speed 3-dimensional sonic anemometer that provides analog outputs—so you can choose the ideal anemometer for your site conditions and measurement objectives. The analyzer can be installed under or beside the sonic anemometer—to accommodate different sites and objectives.

LI-COR provides a variety of compatible sonic anemometers and data cables to simplify this connection.

Tripod and Tower Installations

Sensor head cables are available in five- and ten-meter options. You can install the sensor head up to ten meters from the LI-7550. The Ethernet cable can extend up to several hundred meters from the LI-7550.

Expansion Capabilities

The LI-7200RS supports standard network communication protocols so you can easily add networked devices, including an LI-7700 Open Path CH4 Analyzer, a LI-COR Biomet System, and a cellular or satellite radio.

Internet-Enabled

Access the instrument over the Internet with a direct connection, cellular modem, or satellite communication system—and connect with FluxSuite for online access to your site and networking between sites and research groups.

LI-7200RS 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), RS-232 (115,200 baud; 20 records per second max), 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 × 30 cm × 15 cm (13.8” × 12” × 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 × 30 cm × 15 cm (13.8” × 12” × 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 × 6.5 cm × 4.2 cm (4.5” × 2.6” × 1.7”)
  • Weight: 0.39 kg (0.85 lbs) including mounting bracket

Specifications subject to change without notice.


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