Improved measurement probe for testing coating thickness on flat sheets
AssigneeInnosen Limited
InventorLucien Nelen
Life of this patent
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Abstract
A probe (2) has a handle (4), an upper part having first and second cable connection sockets (8a, 8b) and a compressed air connector (10) and a lower weighted part (12). The base (14) of the probe is conductive, being provided with an annular ring (16) of a carbide material surrounding a large metal disc (18) that has a series of spaced apart air outlets (20). A probe tip (22) of conductive rubber surrounded by a tip holder (23) is provided within an insulated socket (24) within the base of the probe. The tip (22) of the probe (2) provides a first electrode for forming a capacitor and the metal disc (18) and ring (16) form a second electrode of the capacitor.
Claims25
A probe for measuring capacitance of a thin coating, lacquer or varnish applied to a metal sheet, the probe comprising a main body part including at least one weight and a base including a first and a second electrode, the first electrode comprising at least one probe tip of conductive rubber, and the second electrode comprising a metallic plate surrounded by a conductive material with a hardness greater than that of the metallic plate, and wherein an insulating material is provided between the probe tip and the metallic plate.
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A probe tip comprising a conductive rubber tip encased in a non-corrosive, conductive holder, wherein the holder has at least one groove, hole or recess for extraction of the probe tip using an extraction tool.
Dependencies are inferred from the claim text.