Analyzers

LI-7200RS

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Enclosed CO2/H2Analyzer

The next generation of the CO2/H2gas analyzer chosen by leading flux networks around the world including NEON and ICOS.

The LI-7200RS Enclosed CO2/H2Gas Analyzer is designed for high-speed CO2 and water vapor gas exchange measurements. It combines the performance of a closed path analyzer with the ruggedness and low power demands of an open path instrument.

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.

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 H2(mol CO2/mol H2O):
    • ±2.00E-05 typical
    • ±4.00E-05 maximum

H2Measurements

  • 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.

Imagen de LI-7200RS

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