Patent ID: 7520160
Filing Date: 2009-04-21
Classification: G01N

Abstract:
1. An electrochemical sensor comprising: a bulkhead electrode assembly including a cylindrical housing and a cylindrical electrode structure placed in said cylindrical housing; and a seal ring extending around said cylindrical housing and said cylindrical electrode structure to separate a high pressure region and a low pressure region of said cylindrical electrode structure; said cylindrical electrode structure including a cylindrical conductive pin extending from the high pressure region to the low pressure region, and an electrode connected to one end of said cylindrical conductive pin at the high pressure region and having an electrode surface positioned for exposure to a flow path of a fluid or a gas in said high pressure region, whereby an electrochemical reaction occurs at said electrode surface exposed to said fluid or said gas; and an insulating coating over at least a part of a radial surface of said cylindrical conductive pin positioned adjacent to the end connected to said electrode, said insulating coating being impermeable to said fluid or said gas and configured to protect said cylindrical conductive pin from direct contact with said fluid or said gas.