What are the common problems with coating thickness gauges?
1. The indication value is unstable
The factors that cause the coating thickness gauge to show unstable values mainly come from the particularity of the material and structure of the workpiece itself. For example, whether the workpiece itself is a magnetically permeable material. If it is a magnetically permeable material, we must choose magnetic coating thickness measurement. If the workpiece is a conductor, we have to choose an eddy current coating thickness gauge. In addition, the surface roughness and attachments of the measured part are also important factors that cause the instrument's indication to be unstable. The probe of the thickness gauge is extremely sensitive to attachments that prevent close contact with the surface of the covering layer. It is necessary to ensure that the probe is in direct contact with the surface of the overlay. Therefore, the key to eliminating this kind of failure is to remove dust, fine chips, grease, corrosion products and other attachments on the contact surface of the test piece before measurement, but do not remove any covering material. Furthermore, when performing system zero adjustment, the surface of the substrate used must also be clean and lubricated. If you feel that the measurement result error is relatively large, please first do a round of testing with the plastic calibration sheet provided with the instrument. If the error exceeds the allowed error, there may be a problem with the instrument itself and it needs to be returned to the manufacturer for maintenance. The appropriate substrate was not selected during system calibration. The base facet is 7mm and the minimum thickness is 0.2mm. Measurements below this critical condition are unreliable.
2. The measurement results have big errors
The placement method of the probe has a great influence on the measurement. During the measurement, the probe should be kept perpendicular to the surface of the piece under test. Moreover, the probe should not be placed for too long to avoid interference from the magnetic field of the matrix itself. Do not drag the probe when measuring, because this will not only cause wear to the probe, but also will not obtain accurate measurement results. In addition, factors such as the base metal being magnetized, the thickness of the base metal being too small, the curvature of the workpiece being too small, the surface of the measurement base being corroded, and electromagnetic field interference around the measurement site may lead to abnormal measurement results. A crash may occur.
3. The screen does not display data
The simple factor is to check whether the battery power is sufficient. After confirming that the battery power is sufficient, if you find that the measurement still does not display the value, you can consider whether the probe and connection are loose, disconnected or have poor contact, or the battery is corroded due to leakage. Affected by factors such as electronic components within the instrument. In actual work, the editor has encountered the phenomenon that the probe was corroded by chemicals due to improper use, resulting in the instrument not displaying data.
4. Human factors
The reason why the coating thickness gauge can measure to the micron level is that it can take small changes in magnetic flux and convert it into a digital signal. If the user is not familiar with the instrument during the measurement process, the probe may deviate from the measured object, causing changes in the magnetic flux and causing erroneous measurements. When using the instrument for the first time, the user should carefully read the instructions and master the measurement methods.
5. The instrument itself breaks down
Thickness gauges that are in working condition for a long time are very likely to have vibrations, falls, and other accidents, or the working environment where they are located has magnetic field interference, causing interference and damage to the internal electronic parts of the instrument, and because it has been used multiple times and in multiple locations. , resulting in unreliable instrument measurement data, garbled screen data display, and even failure to boot, etc. Therefore, it is recommended to ensure that dedicated personnel use and keep the instrument as much as possible, and return it to the factory for repair in a timely manner if a malfunction occurs. Do not disassemble the instrument without authorization for inspection.
