Advantages of the LI-7500A
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.
Key Features
- 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)
* at 10 Hz, at 370 ppm CO2 and 10 mmol/mol H2O
The LI-7550 (included) is a weatherproof enclosure that houses the control unit's high speed Digital Signal Processing (DSP) electronics. Ethernet and Serial data are output at selectable speeds of up to 20 Hz, and linearized user-configurable Digital-to-Analog Converters (DACs) output analog signals at up to 20 Hz bandwidth. The LI-7550 also offers SDM communication for use with Campbell Scientific data loggers.
Already own an LI-7500? Upgrade to the LI-7500A for these benefits and more:
- Onboard high speed data logging
- Lower power consumption in cold environments
- Data imports directly into EddyPro Express for processing
The World-Wide Standard
LI-7500A images courtesy of National University of Singapore, Princeton University, National Institute for Agro-Sciences
The 7500 family (including the LI-7500 and LI-7500A) is the most widely used group of open path CO2/H2O analyzers in the world. Since its introduction in 1999, scientists have come to know that the LI-7500 provides high precision, accuracy, and stability. The LI-7500A continues to provide the high performance that scientists expect.
The LI-7500 family has been directly cited in over 1500 scientific publications. Data collected with the LI-7500 have been cited in UNFAO (United Nations Food and Agriculture Organization) publications, IPCC Reports, and the journals Science and Nature.
The LI-7500/7500A is used by major flux networks around the world including...
