Patent ID: 7084466

Claim:
A sensor for detecting a conductive liquid exposed to a semiconductor wafer within a semiconductor wafer process comprising: an electronic circuit adapted to detect changes in electrical conductivity; a sensor probe comprising at least one metal trace connected to said electronic circuit, said at least one metal trace exposed on at least one side to come in contact with said conductive liquid, and bonded in a serpentine pattern on said end effector on said backside and said front side of said end effector; and, an end effector attached to a robotic arm, said end effector holding said semiconductor wafer, and having a front side and a backside, and adhesively holding said at least one metal trace; said electronic circuit configured as an electrical “OR” signal detector to measure independently a signal from said at least one metal trace bonded on said backside of said end effector, or a signal from said separate metal trace bonded on said front side of said end effector.