Magnetic thickness gauges for non-destructive measurement of coating thickness (paints, enamels, zinc coatings, oxide layers).
Non-destructive measurements of coating thickness can be carried out both on magnetic steel surfaces and on non-magnetic metal surfaces such as stainless steel or aluminium.
Electromagnetic induction is used for non-magnetic coatings on ferrous substrates such as steel, while the eddy current principle is used for non-conductive coatings on non-ferrous metal substrates.
- Three different families of coating thickness gauges are available: gauges that measure non-magnetic coatings on magnetic substrates (for example paint or zinc on iron), gauges that can measure non-metallic coatings on non-magnetic substrates (for example paint on aluminium) and gauges that can measure non-metallic coatings on non-metallic substrates (for example paint on wood or concrete).
- The most common application is the measurement of non-magnetic coatings on magnetic (ferrous) substrates, for example measuring the thickness of paint or zinc on iron. Analogue gauges use a magnet to test how much force is needed to pull the magnet off the material; the thicker the coating, the easier it is to pull the magnet off the surface. Digital gauges use the magnetic induction principle to determine the distance between the coating thickness gauge and the magnetic metal substrate. This measuring method can be very precise, especially when the surfaces are flat.
- To measure non-metallic coatings on non-magnetic metals, the distance between the gauge head and the metal substrate is measured using the eddy current principle. An example of this application is measuring the thickness of paint on aluminium.
- Some coating thickness gauge models are available with a dual measuring function, for both ferrous and non-ferrous materials. These gauges are supplied with a probe that can automatically determine whether the substrate is magnetic (ferrous) or non-magnetic (non-ferrous) and automatically select the correct operating mode.
- The measurement of non-metallic coatings on non-metallic substrates, such as paint on wood or concrete, can be carried out with an ultrasonic coating thickness gauge. This gauge measures the coating alone by sending an ultrasonic wave into the coating and measuring the time taken for the signal to be reflected from the back wall of the coating. This means that coating and paint thickness can be measured on any substrate. Advanced models can also measure the thickness of the individual paint layers. When a surface has been painted three times, the most advanced gauge models are able to determine the thickness of each individual paint layer.
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