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The ABCA is a continuous flow Gas Isotope Ratio Mass Spectrometer (GIRMS) System intended for use in the measurement of stable isotopes of carbon, nitrogen, and oxygen in gas samples. For this purpose, the system is comprised of a gas sampling module, a gas purification module, and an isotope ratio mass spectrometer which are synchronously coupled by means of an external personal computer which also collects and archives data.

The ABCA is an acronym for a configuration of modules intended for use in analysis ${}^{13}$C and ${}^{18}$O in CO${}_2$ and ${}^{15}$N in N${}_2$ and N${}_2$O gas samples. The ABCA System includes: - The Europa 20-20 continuous flow IRMS - A gas purification module (Gas Chromatograph) - An autosampler - An IBM (or compatible) personal computer for system control, data analysis and data storage