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The coating thickness measurement instruments are also called film thickness gauge, coating thickness gauge or paint film thickness gauge. Different types of coating measurement instruments can measure the thickness of the coating layer on the surface of the metal substrate through magnetic methods, eddy current methods, etc.
Different thickness gauge meters are used with different principles, and the accuracy of measurement is also different. Commonly instrument used to measure paint thickness generally support magnetic thickness measurement and eddy current thickness measurement. Relatively speaking, the magnetic method has higher measurement accuracy, but this method also has certain limitations.
The coating thickness instrument can easily and non-destructively measure the thickness of non-magnetic coatings on ferromagnetic materials, such as zinc, copper, chromium coatings on steel surfaces, or coatings such as paint, enamel, glass fiber reinforced plastic, sprayed plastic, and asphalt.
The magnetic method can be used to measure the thickness of various non-magnetic coatings sprayed on various magnetic substrates (such as steel materials), such as paint layer, powder spray layer, porcelain layer, chromium plating layer, copper plating layer, and zinc plating layer on iron plates.
The eddy current method can measure the thickness of all insulating coatings sprayed on non-magnetic metal substrates (such as aluminum, copper, brass and stainless steel).
Therefore, the common eddy current coating thickness measurement functions are different, by which they can be divided into iron-based coating thickness instruments, aluminum-based coating thickness instruments, and dual-purpose coating thickness instruments. Then, according to the form of the probe, they can be divided into one-piece type and split type.