ELECTROCHEMICAL DETECTION CELL

• US 3,776,832 A
• Filed: 11/10/1970
• Issued: 12/04/1973
• Est. Priority Date: 11/10/1970
• Status: Expired

• Current Assignee: Becton, Dickinson & Co
• Original Assignee: N/A
• Time in Patent Office: 1,120 Days
• US Class Current: 204/411
• CPC Class Codes: G01N 27/4045 for gases other than oxygen

Abstract

AN ELECTROCHEMICAL CELL COMPRISING AN ANODE, A CATHODE AND A REFERENCE ELECTRODE OPERATING IN AN AQUEOUS ELECTROLYTE IS UTILIZED FOR DETECTION OF NOXIOUS GASES IN AIR. THE GAS IS OXIDIZED AT THE ANODE AND DETECTION THEREOF OCCURS AS A RESULT OF THE CURRENT GENERATED BY THE REACTION. A FIXED POTENTIAL DIFFERENCE IS MAINTAINED BETWEEN THE ANODE AND THE REFERENCE ELECTRODE TO AVOID GENERATION OF UNDESIRED CURRENT FROM REACTIONS INVOLVING AN

OXYGEN-WATER REDOX COUPLE WITHIN THE CELL WHICH WOULD INVALIDATE ANODE-CATHODE CURRENT FOR GAS DETECTION PURPOSES. THE FIXED POTENTIAL IS CHOSEN FROM WITHIN THE RANGE OF ABOUT 0.9 TO 1.5 VOLTS.

Claims