The ABB AK Series of gas analyzers provide an accurate and stable concentration measurement of the target gas in a binary or pseudo binary gas mixture.
The measuring cell, commonly known as a Katharometer, compares the thermal conductivity of the sample gas to that of a reference gas, the difference in conductivity can then be calibrated to give a reading of concentration.
This simple, robust technique has been refined and proven over many years in a wide range of industries and applications.