Coating thickness measurement is a concern for both finishers and for companies receiving finished components. As defective coatings often lead to rust generation and component failure. The product liability requires quality control of coatings, and in many cases documentation of measurements in an electronic format. Moreover, conflicts can occur if a manufacturer and a customer of a finished good use different methods or types of instruments to determine coating thickness. Hence, there is a need for one standard coating thickness instrument to obtain accurate and trusted results. Here, we will discuss on calculating the coating thickness of Non-ferrous materials using the eddy-current based instrument, i.e. Coating thickness gauge.

Eddy-Current based testing machine

The eddy-current method of coating thickness measurement determines non-conductive coatings on non-ferrous conductive substrates, non-ferrous conductive coatings on non-conductive substrates and some non-ferrous metal coatings on non-ferrous metals. Advantages of the eddy-current based testing instrument are low cost, ease of operation, accuracy, repeatability and instantaneous measurement with a digital display.

Eddy-current coating thickness measurement uses a probe that also contains a coil. This probe/coil is driven by a high-frequency oscillator to generate an alternating high-frequency field. When this field is brought near a metallic conductor, eddy currents are generated in that conductive material, which results in the impedance change of the probe coil.

The distance between the probe coil and the conductive substrate material determines the amount of impedance change. Therefore, the coating thickness is determined by the impedance change in the form of a digital reading.

Common applications for eddy-current coating thickness measurement include liquid or powder coating over aluminum and non-magnetic stainless steel as well as anodize over aluminum.

The Testing Instrument

Labtiger, one of the leading manufacturer of testing instruments presents non-ferrous coating thickness gauge.

Coating thickness gauge non-ferrous is used for non-ferrous materials having non-conductive coating (paint, enamel, rubber plastic etc.) or for non-magnetic metal (aluminum, copper, zinc, tin, etc.) Calibration facility is provided with the instrument as an inbuilt feature. The test results can be recorded in real-time with LCD display equipped with the device. It is one of the most popular methods for coating thickness evaluation.

The gauge comes with flexible lead measuring probes along with a set of 5 calibration foils and zero disks. It is fit for single and multiple point calibration and provides an accuracy of ±2.5 mm. The thickness ranges from 0 to 1250 mm.  

It is highly a portable device with you as it comes with an industrial carrying case

For more information on the thickness measurement instruments or for any technical assistance, kindly contact our expert team here.