Patent ID: 7859273
Filing Date: 2010-12-28
Classification: G01N

Abstract:
1. A system comprising: an elongate non-conductive substrate having first and second opposed surfaces; a first sensor surface disposed on at least a portion of said first surface of said substrate and a second sensor surface disposed on at least a portion of said second surface of said substrate; a bridging electrode electrically coupling said first and second sensor surfaces; and a first electrode disposed on said first surface of said substrate and electrically coupled to said first sensor surface, and a second electrode disposed said second surface of said substrate and electrically coupled to said second sensor surface, said first and second sensor surfaces and said bridging electrode providing a conductive path between said first and second electrodes, said conductive path having a first resistance when at least one of said sensor surfaces is in contact with an organic liquid and a second resistance when said sensor surfaces are not in contact with an organic liquid.