There is a wide range of thickness gauges of the following types:
- mechanics,
- electromagnetic,
- ultrasonic,
- magnetic,
- eddy current.
Mechanical devices are the simplest models, which have the form of a scalloped plate along its edges. The marking on the comb allows you to determine the size of the paint, putty, soil layer immediately after it is applied to the base. When measuring, the integrity of the coating is violated.
An electromagnetic thickness gauge works using the magnetic induction effect and measures the thickness of a layer on a metal surface according to the magnetic field parameter. Measurements are taken without disturbing the scope, the accuracy of the data does not give an error of more than 3%.
The ultrasonic thickness gauge is one of the most accurate and allows you to determine not only the thickness of the layer, but also the number, depending on the material. An ultrasonic wave penetrates the object, is reflected back and is captured by the device's sensor. Such thickness gauges can easily distinguish the layers of putty, primer and paint. They use quality control tools for the manufacture of various products, measure coatings on any surface: glass, ceramics, etc. However, the tools are not suitable for measuring coatings on concrete, wood and foam surfaces.
The ultrasonic thickness gauge will do its job well not only in the lab but also in the field. Let's apply in metallurgical, machine-building, energy and mining enterprises, as well as in specialist and technical centers.
Magnetic devices are suitable for measuring coatings on metal surfaces (ferrous metals). The working body of the device is a permanent magnet and the measurement is made according to the decrease in the magnetic field depending on the thickness of the coating.
An eddy current thickness gauge is used on conductive surfaces. The generator of the device creates an electromagnetic field on the surface, whose eddy currents and parameters are affected by the insulating coating layer. This kind of device is highly sensitive in copper and aluminum products, it can measure metal objects to which magnetic patterns do not respond.