Common issues with coating thickness gauges and their fixes
The failures of the coating thickness gauge mainly include unstable indication, large measurement errors, and no data displayed on the screen. The factors that cause these failures come from the instrument itself, the factors of the workpiece to be measured, and the influence of human beings. Zhuhai Tianchuang Instrument Co., Ltd. will introduce the common failures and solutions of coating thickness gauges below.
1. The display value is unstable
The factors that lead to the unstable display of the coating thickness gauge mainly come from the particularity of the material and structure of the workpiece itself, such as whether the workpiece itself is a magnetic material. If it is a magnetic material, we must choose a magnetic coating thickness measurement Instrument, if the workpiece is a conductor, we have to choose an eddy current coating thickness gauge. Furthermore, the surface roughness and attachments of the measured piece are also important factors that cause the instrument to display unstable values. The probe of the thickness gauge is extremely sensitive to those 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 coating. Therefore, the key to eliminating this kind of fault is: remove the dust, fines, grease and corrosion products and other attachments on the contact surface of the tested part before measurement, but do not remove any covering material. In addition, when the system is zeroed, the surface of the substrate used must also be cleaned and lubricated. If you feel that the error of the measurement result is relatively large, please use the plastic calibration sheet equipped with the instrument to do a round of testing first. If the deviation is far from the allowable error, there may be a problem with the instrument itself, and it needs to be returned to the manufacturer for repair. The appropriate matrix 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. Large errors in measurement results
The placement method of the probe has a great influence on the measurement. During the measurement, the probe should be kept straight with the surface of the tested object. Moreover, the placement time of the probe should not be too long, so as to avoid the interference of the magnetic field of the matrix itself. Do not drag the probe when measuring, because it will not only cause wear to the probe, but also will not get perfect measurement results. In addition, the base metal is magnetized, the thickness of the base metal is too small, the curvature of the workpiece is too small, the surface of the measurement base is rusted, and there is electromagnetic field interference around the measurement site, etc., which may lead to abnormal measurement results. There may be a crash phenomenon.
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 the measurement still does not display the value, you can consider whether the probe and the connection are loose, disconnected or have poor contact, and the battery is corroded after leakage. Influenced by factors such as electronic components in the instrument. In actual work, the editor has encountered the phenomenon that the probe is 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, he may make the probe deviate from the measured object, causing the magnetic flux to change and cause wrong measurement. When the user uses the instrument for the first time, he must first carefully study the instruction manual and master the measurement method.
5. The instrument itself fails
Thickness gauges that have been in the working state for a long time are very likely to have shocks, falls, and other accidents, or the working environment has magnetic field interference, which will cause interference and damage to the electronic components inside the instrument. , resulting in unreliable measurement data of the instrument, garbled data display on the screen, and even inability to start the machine, etc. Therefore, it is recommended to ensure that the instrument is used and kept by a special person as much as possible, and returned to the factory for repair in time when a fault occurs, and it is not allowed to disassemble the machine for inspection without authorization.
