Precautions for purchasing coating thickness gauge
The thickness measurement of the cladding has become the most important process necessary for the quality inspection of finished products in the metal processing industry, and it is an essential means for testing products to meet the highest standards. At present, the thickness of the coating has been generally measured according to the unified international standard at home and abroad. The "Measurement Law of the People's Republic of China" also puts forward technical requirements for the thickness measurement of the coating thickness gauge. The choice of coating thickness gauge becomes more critical with the gradual progress in the research on the physical properties of materials. The following summarizes the eight points that need to be paid attention to when purchasing a thickness gauge:
1. First of all, it is necessary to understand the requirements of the test, such as the test base material, coating material, test range and accuracy requirements. If the test is performed under wet film or high temperature conditions, special instructions are required.
2. Secondly, for the measurement of the thickness of plastic film, paper towel and tin foil, the choice of measuring instrument model is not limited.
3. For workpieces with curvature, it is necessary to provide the value of the radius of curvature to compare whether the curvature of the coating thickness gauge meets the requirements of on-site measurement. If it exceeds the standard, a special probe is required.
4. Purchase coating thickness gauges from regular channels. Due to serious measurement errors in the trial stage of the product, when it was tested by the local metrology institution, it was told that the machine did not comply with the "Measurement Law of the People's Republic of China", and the manufacturer had not obtained the "License for Manufacturing Measuring Instruments". When the consumer took the original machine to the place of sale and asked to return it, he was refused. In fact, such incidents are not uncommon in the process of purchasing testing instruments. In most cases, there is an extra letter of A than the regular manufacturer's product model or the use of a similar model. When consumers do not know the equipment model, they are confused with the real one, so consumers are invited to buy Pay special attention to this, and consult the regular thickness gauge manufacturer in advance.
5. The standard configuration of the coating thickness gauge includes calibration test pieces, which cannot be reduced, otherwise the subsequent calibration and measurement accuracy of the instrument will be affected.
6. For the application of special industries, different types of sensors need to be selected, such as whether it is ultra-thick coating measurement.
7. When choosing to use a magnetoresistive coating measuring instrument, there should be no magnetic field around the environment.
8. The standards of the coating thickness gauge conform to the "Measurement Law of the People's Republic of China", and it is recommended to purchase from a measuring instrument manufacturer that has obtained CMC certification.
