LI-7000: The Next Generation CO2/H2O Gas Analyzer

Click here for more information on features of the latest LI-7000 digital board.

LI-7000 "Features and Benefits for Eddy Covariance Studies." Download a PDF.

 

The LI-7000 CO2/ H2O Gas Analyzer is a high performance, dual cell, differential gas analyzer.  It uses a dichroic beam splitter and two separate detectors to measure infrared absorption by CO2 and H2O in the same gas stream.  At the heart of the LI-7000 is an innovative optical bench that can be dismantled and cleaned by the user without the need for factory recalibration. 

Why the LI-7000?

The LI-7000 offers eye-opening performance for the most demanding operations. Consider the following:

• High precision and sensitivity.
• Digital signal processing for lightning fast output, lower noise, and precise digital filtering.
• USB and RS-232 interface capability.
• An optical bench that can be easily removed and cleaned in the field. Factory recalibration is not required, virtually eliminating costly repairs and lost time that can occur when using analyzers in dirty environments.
• Built-in-pressure sensor with 0.1% accuracy, for automatic compensation for pressure changes in the sample cell.
• Built-in auxiliary pump can be used for either sample or reference cell.
• Direct connection of air fittings to the optical bench eliminates diffusive leaks. 
• Heat exchangers equilibrate incoming air to the cell temperature; data require no corrections for pressure differences due to temperature effects.
• Large diameter inlet ports allow high flow rates with virtually no back pressure, even at flow rates of 10 lpm.
• An innovative method of operation called Reference Estimation Mode (REM) allows for accurate differential measurements when the reference cell concentration is unknown.
• Simple Windows® software for setup, control, and data logging.  Intelligent diagnostic indicators warn of potential problems, before data are compromised.