Patent ID: 6692625
Filing Date: 2004-02-17
Classification: G01N

Abstract:
A method for producing an electrochemical sensor including an electrochemical pump cell having two electrodes and a gas chamber, the method comprising the steps of:producing a gas inlet opening in the electrochemical sensor; providing a sampled gas to the gas chamber of the electrochemical pump cell via the gas inlet opening; completely covering the gas inlet opening with a covering layer, the covering layer being composed of one of: i) a pore-forming material, and ii) a material that burns without leaving a residue; after the gas inlet opening is completely covered with the covering layer, applying a porous cover over the gas inlet opening so that the porous cover completely covers the gas inlet opening; applying a heat treatment to the covering layer after the porous cover is applied; and allowing fluid communication between the gas chamber and the sampled gas via the gas inlet opening through the porous cover; wherein the covering layer is composed of one of carbon black, graphite, wax, methyl xanthine, theophylline and caffeine.