The invention includes a method and apparatus for a chromatography system having
a chromatographic column for separating gases in a mixture from one another and
an electrochemical gas sensor coupled to the chromatographic column for detecting
a gas being emitted from the column. The electrochemical gas sensor further includes
a substrate having a surface for depositing electrodes thereon, an ionomer membrane
in contact with the surface, an electrode in contact with the surface, and an opening
in the ionomer membrane in a location proximate to the electrode for permitting
a gas to diffuse through the opening to simultaneously contact the electrode and
the ionomer membrane within the opening.