How to get the measurement data of the portable coating thickness gauge
The use of portable coating thickness gauge has the characteristics of small measurement error, high reliability, good stability, and easy operation. It is an indispensable testing instrument for controlling and ensuring product quality. It is widely used in manufacturing, metal processing, Chemical industry, commodity inspection and other testing fields.
In actual use of the portable coating thickness gauge, certain conditions must be met in order to obtain measurement data:
Base Metal Properties
For the magnetic method, the magnetic properties and surface roughness of the base metal of the standard sheet should be similar to those of the test piece base metal.
For the eddy current method, the electrical properties of the base metal of the standard sheet should be similar to those of the base metal of the test piece.
base metal thickness
Check whether the thickness of the base metal exceeds the critical thickness. If not, one of the methods in 3.3 can be used for calibration.
edge effect
The measurement should not be made at the sudden change of the test piece, such as edges, holes and inner corners.
curvature
should not be measured on the curved surface of the test piece.
Number of readings
Often several readings must be taken within each measurement area since each reading from the instrument is not exactly the same. Local variations in cover thickness also require multiple measurements in any given area, especially when the surface is rough.
surface cleanliness
Before measurement, any attached substances on the surface should be removed, such as dust, grease and corrosion products, etc., but do not remove any covering substances.
What are the factors that affect the thickness of the portable coating thickness gauge? In the process of producing products, it may be because of a little error that this batch of products may become scrap products, and this situation is most common among mass-produced manufacturers. It is also the most important point to pay attention to. Therefore, we have to understand the factors that affect the thickness of the coating thickness gauge.
(1) The influence of attached substances. The instrument is sensitive to adhering substances that prevent the probe from making intimate contact with the overlay surface. Therefore, the attached substances must be removed to ensure that the probe is in direct contact with the surface of the covering layer. When performing system calibration, the surface of the selected substrate must also be bare and smooth.
(2) Human factor. This situation often happens to new users. The reason why the coating thickness gauge can measure to the micron level is that it can take the small change of magnetic flux and convert it into a digital signal. If the user is not familiar with the instrument in the process of measuring with the instrument, the probe may deviate from the body under test, and the magnetic flux csgia.net will change, resulting in wrong measurement. Therefore, it is recommended that users and friends first master the measurement method when using the instrument for the first time. The placement of the probe has a great influence on the measurement. During the measurement, the probe should be kept perpendicular to the surface of the sample. And the probe should not be placed for too long, so as not to cause the interference of the magnetic field of the matrix itself.
(3) Interference from strong magnetic fields. We have done a simple experiment, when the instrument works near the electromagnetic field of about 10,000 V, the measurement will be seriously disturbed. If it is very close to the electromagnetic field, there may be a crash phenomenon.
(4) An appropriate substrate was not selected during system calibration. The minimum plane of the substrate is 7mm, and the minimum thickness is 0.2mm. Measurements below this critical condition are unreliable.
(5) The instrument breaks down. At this time, you can communicate with technicians or return to the factory for repair.
