AN038: Measuring Small Volume Gas Concentrations with the SSIM

AN038: Measuring Small Volume Gas Concentrations with the SSIM

The Picarro Small Sample Introduction Module (SSIM) is designed for processing small volumes of gas samples through a Picarro analyzer. This application note serves as a method guide so that accurate and precise measurement can be made.

Abstract: 

Previously, a single sample introduction could achieve a maximum concentration of only 94% of its original concentration, due to injection volumes between 1-20 mL from bags or syringes and limitations in the SSIM design. For example, a 1000 ppm CO2 sample will be measured as ~940 ppm at best. With a minor modification of the method, we can now expand the functionality of the SSIM so that more accurate concentration measurements can be performed on both isotopic and concentration analyzers. The dilution effects inherent in the SSIM design are reduced further, meaning that sample measurements can now achieve concentration values of up to 99.4% of their original concentration; with no trade-offs in isotopic precision.