Common coating thickness gauges faults and how to fix these
The main faults of the coating thickness gauge include unstable display of values, significant measurement errors, and no display of data on the screen. The factors that cause these problems are not only from the instrument itself, but also from the elements of the tested workpiece, and also from human influence. Below, Zhuhai Tianchuang Instrument Company will introduce common faults and solutions of coating thickness gauges to you
1. The display value is unstable
The main factors that cause the unstable display of the coating thickness gauge are the data and structural characteristics of the workpiece itself, such as whether the workpiece itself is a magnetic material. If it is a magnetic material, we need to choose a magnetic coating thickness gauge. If the workpiece is a conductive material, we need to choose an eddy current coating thickness gauge. Furthermore, the surface roughness and adhesion of the tested object are also important factors that cause the instrument to display unstable values. The probe of the thickness gauge is extremely sensitive to adhesion substances that hinder close contact with the surface of the covering layer. It is necessary to ensure that the probe touches the surface of the covering layer directly. Therefore, the key to cleaning up this problem is to remove dust, fine particles, grease, and corrosion products from the contact surface of the tested object before measurement, but do not remove any covering material. Furthermore, when performing system zeroing, it is necessary to clean and lubricate the surface of the substrate used. If you feel that there is a significant error in the measurement results, please conduct a round of testing with the plastic calibration sheet of the instrument equipment first. If you violate the promise and the error is far away, it may be due to the instrument itself and need to be returned to the manufacturer for maintenance. Not selecting a suitable substrate on time in the system school. The substrate has a small plane of 7mm and a small thickness of 0.2mm. Measuring below this critical condition is unreliable.
2. Significant measurement errors
The placement method of the probe has a significant impact on the measurement, and 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 to avoid the disturbance of the matrix's own magnetic field. Do not drag the probe during measurement, as this will not only cause wear on the probe but also result in inaccurate measurement results. In addition, factors such as magnetization of the base metal, too small thickness of the base metal, too small curvature of the workpiece, rust on the surface of the measuring base, and electromagnetic field disturbance around the measuring site may all cause anomalies in the measurement results. If the distance from the electromagnetic field is very close, there may also be a possibility of a crash.
3. The screen does not display data
The brief element is to check whether the battery is fully charged. If the measurement still does not show the value after determining that the battery is fully charged, one can consider whether there are factors such as loose or disconnected measuring heads and connections, poor touch, or corrosion of electronic components inside the instrument due to battery leakage. The editor has encountered situations in actual homework where the instrument does not display data due to improper use of the measuring head being corroded by chemicals.
4. Human factors
The reason why the coating thickness gauge can measure to the micrometer level is because it can adopt 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, it may cause the probe to deviate from the measured object, causing changes in magnetic flux and resulting in incorrect measurements. When using the instrument for the first time, the user should carefully read the instruction manual and grasp the measurement method.
5. The instrument itself malfunctions
A thickness gauge that has been in operation for a long time may experience accidents such as shaking, falling, or being disturbed by magnetic fields in the working environment, causing damage to the internal electronic components of the instrument. It is also due to the use of multiple people and addresses, resulting in unreliable measurement data, garbled screen data, and even inability to turn on the device. Therefore, it is recommended to ensure that the instrument is used and kept by a dedicated person as much as possible, and to promptly return to the factory for repair if any problems occur. Unauthorized disassembly and inspection are not allowed.
