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LI-COR - LI-7500A

Manufactured by  LI-COR
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The LI-7500A is a high speed, high precision, non-dispersive infrared gas analyzer that accurately measures densities...

The LI-7500A is a high speed, high precision, non-dispersive infrared gas analyzer that accurately measures densities of carbon dioxide and water vapor in-situ. With the eddy covariance technique, these data are used in conjunction with sonic anemometer wind speed to determine the fluxes of CO2 and H2O into and out of ecosystems.

The LI-7500A accepts analog data from a sonic anemometer and logs complete data sets to a removable USB storage device.
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Features of LI-7500A
  • Low power consumption: 12 W during normal operation
  • High Speed: up to 20Hz bandwidth
  • High Precision: 0.11 ppm CO2, 0.0047ppt H2O*
  • Excellent stability
  • Absence of tubing eliminates delays and sorption effects
  • No Signal Attenuation for CO2/H2O
  • Suitable for harsh environments
  • Analog inputs and on-board data storage allow the LI-7500A to log complete eddy covariance data sets (CO2, H2O, U, V, W, and TS , and other variables)
General Specifications
Power Requirements 10.5 to 30 volts DC
Additional Specifications

Type: Absolute, open-path, non-dispersive infrared gas analyzer.
Detector: Thermo-electrically cooled lead selenide.
Bandwidth: 5, 10, or 20 Hz, software selectable.
Path Length: 12.5 cm (4.72").
Operating Temperature Range: -25 to 50°C (-40 to 50 °C verification test available on request).
User Interface: Windows® based software supports all setup, configuration and calibration functions through RS-232 serial port or Ethernet.

Outputs
Ethernet: Up to 40 Hz
RS-232: 115,200 baud, 20 samples per second max.
SDM: up to 50 Hz
Digital-to-analog Converters (6): user scalable, 0 to 5 V, single ended

Inputs: Ethernet, 4 general purpose ± 5 V analog inputs.
Power Consumption: 30 W during warm-up, 12 W in steady state.

Dimensions
Head: Dia 6.5 cm, Length 30 cm. Designed for minimal wind flow disturbance.
Control Box: 35 cm x 30 cm x 15 cm (external dimensions).
IRGA cable: 5 meters standard, 10 meters available (between sensor head and electronics control box).
Power, Serial, DAC, Auxiliary Input and SDM cables: 5 meters

Weight
Head: 0.75 kg (1.65 lb.)
LI-7550 Analyzer Interface Unit: 4.4 kg (10 lbs.)

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