How can Using Coating Thickness Gauges Avoid Reducing Errors?

From:Linshang Time:2020/02/01 11:00:00 Browse:117
Coating thickness gauges are widely used in various industries. This article mainly describes the reasons why coating thickness gauges affect measurement accuracy and the correct use of coating thickness gauges to reduce errors.

Causes of coating thickness gauge affecting measurement accuracy

1.When the thickness of the cover layer is greater than 25, its error is approximately proportional to the thickness of the cover layer;

2.The conductivity of the base metal has an influence on the measurement, it is related to the composition of the base metal material and the heat treatment method;

3.Each kind of thickness gauge requires a critical thickness of the base metal. Only if it is greater than this thickness, the measurement will not be affected by the thickness of the base metal;

4.The eddy current thickness gauge has an edge effect on the determination of the pattern, that is, the measurement near the edge of the pattern or the inner corner is unreliable.

5.The curvature of the sample has an influence on the measurement, and this effect will increase significantly with the decrease of the radius of curvature;

6.The surface roughness of the base metal and the cover layer affects the accuracy of the measurement, and the roughness increases, and the effect increases;

7.Eddy current thickness gauge is sensitive to the adherent substances that prevent the probe from coming into close contact with the surface of the cover. Therefore, the dirt on the surface of the probe and the cover should be removed before measurement

How to use coating thickness gauge to avoid reducing errors

1. When using a coating thickness gauge for measurement, try to use the measured material as the base for zero adjustment, so as to avoid the guidance caused by different materials. The magnetic properties are different and measurement errors occur. Wait until the same part of the material under test is zeroed, and then measure the same part, such as the edge and the middle part of the side face of the workpiece should be adjusted separately.

2. When using the coating thickness gauge to measure, you should also pay attention to the probe and the material surface to be kept vertical to avoid large errors. If it is the same point for measurement, you can leave the probe more than 10 cm each time, and then perform the measurement after a few seconds, so as not to affect the measurement result due to the magnetization of the measured material probe.

3. The coating thickness gauge as a zero-adjusting surface needs to be kept as smooth as possible. If the surface is not smooth, the average value should be taken as appropriate, because the surface roughness has a greater impact on the measured value. Different structures should be measured separately for zero adjustment, plane zeroing for the side face plane, measuring for the concave surface after zeroing, and measuring for the convex surface after zeroing, to avoid measurement errors due to different structures.

The coating thickness gauge uses the principle of magnetic induction and eddy current to non-destructively detect the thickness of the coating or plating layer on the metal work. The coating thickness gauge developed and developed by Linshang Technology is an iron-aluminum dual-purpose coating thickness gauge, which does not need to be switched. The instrument automatically recognizes the substrate, which makes operation easier. The measuring range of different instruments is different, meeting a variety of measurement needs, and can measure up to 5mm.

The accuracy of the three coating thickness gauges independently developed by Linshang Technology is consistent with the accuracy of the Qnix. It is currently the highest precision instrument in domestic coating thickness gauges. LS221 and LS223 coating thickness gauges are externally connected, suitable for narrow test space. The probe can be inserted into the test point for testing.

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