The Inline Diluter is an air sampling dilution system that can dilute samples to concentrations that are easily detected by a Portable GC such as the FROG or the TOCAM.
The Chromatogram below illustrates this:
The Red is 860 ppbv BTEX undiluted and the result is off scale (note the plateaus, these indicate the concentration is higher than the instrument can read).
The purple, green and blue are the same concentration (860 ppbv) with the inline diluter. Each color is a different split, which results in a different dilution factor. With the Inline Diluter the results are now within scale.