The LI-7500A CO2/H2O Analyzer. The LI-7500A is an improved revision of the original LI-7500 Analyzer. There are two main components to this instrument. The Sensor Head has the part number LI-7540 (and serial numbers beginning with 75H-XXXX). It connects to the LI-7550 Auxillary Interface Unit (serial numbers beginning with AIU-XXXX). LI-COR began producing these new LI-7500A Open Path Gas Analyzers in 2010, but have been producing the original LI-7500 Analyzers since 1999.
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