Coating Thickness Gauge Measurement Method and Troubleshooting
The high-precision coating thickness gauge uses the magnetic flux that flows into the iron substrate through the non-ferromagnetic coating to measure the thickness of the coating. The thicker the coating, the smaller the magnetic flux. When the probe with the coil around the soft iron core is placed on the object to be tested, the instrument will automatically output the test current, the magnitude of the magnetic flux will affect the magnitude of the induced electromotive force, and the instrument will amplify the signal to indicate the coating thickness. When the probe is close to a conductive metal body, an eddy current is formed in the metal material. This eddy current increases as the distance from the metal body decreases and affects the magnetic flux of the probe coil. A measure of the size of the spacing between metals.
The high-precision coating thickness gauge can detect the thickness of non-magnetic coatings on magnetic metal substrates such as steel. And galvanizing of accessories, etc. require coating thickness inspection, so that the workpiece can be protected more effectively, and the results are accurate and objective; it is also widely used in the steel structure product manufacturing industry, and the main quality inspection link is inseparable from it, such as bridges , brackets, iron towers, ship boards, including road guardrails, etc., as well as printed circuit boards, and screen printing; in summary, in the chemical, electronic, electric power, metal and other industries, the thickness measurement of the cladding is a metal processing The industry implements an important process of finished product testing, which is an effective way for products to reach specifications.
Common faults of high-precision coating thickness gauges:
1. The battery is low.
The battery should be removed when the instrument is not in use for more than 5 days. If the instrument shows a low voltage prompt, it is necessary to replace the battery in time to ensure the performance of the instrument.
2. Restore factory settings.
When the operation is wrong and you don’t know how to correct it, you can restore the factory settings according to the instruction manual of the coating thickness gauge. Different brands of coating thickness gauges have different steps to restore the factory settings, and the specific operating instructions shall prevail.
3. Measuring head calibration correction.
If there is a large error in the measurement result of the instrument, the instrument can be recalibrated according to the method of multi-point correction.
