What are the types of coating thickness gauges Thickness gauge selection guide
Coating thickness gauges generally have the following five types according to the measurement principle:
1. Magnetic thickness measurement method: It is suitable for measuring the thickness of the non-magnetic layer on the magnetic material. Magnetic materials are generally: steel, iron, silver, nickel. This method has high measurement accuracy.
2. Eddy current thickness measurement method: suitable for measuring the thickness of non-conductive layers on conductive metals. This method is less accurate than the magnetic thickness measurement method.
3. Ultrasonic thickness measurement method: It is suitable for the measurement of the thickness of multi-layer coating or the occasion where the above two methods cannot be measured. But generally expensive, measurement accuracy is not high.
4. Electrolytic thickness measurement method: This method is different from the above three methods. It does not belong to non-destructive testing. It needs to destroy the coating layer, and the general accuracy is not high. It is more troublesome to measure than other kinds.
5. Radiographic thickness measurement: The instrument here is very expensive (generally above 100,000 RMB), and it is suitable for some special occasions.
The first and second methods are commonly used in China at present.
The coating thickness gauge can accurately measure the coating of several microns, and the warranty is three years.
The coating thickness gauge we often say is generally a thickness gauge with magnetic and eddy current principles, which are divided into split type and integrated type. The split type refers to the magnetic F probe and non-magnetic N-type probe that are separated from the host. Link, use magnetic to measure iron-based materials, insert F probe, and insert N-type probe for non-magnetic aluminum-based materials. This kind of host and probe are separated to ensure that the detection amount is not interfered by the electromagnetic field of the host, and the accuracy is high. Domestic Zhongke Park Road PD-CT2 coating thickness gauge has an error of 0.5 microns.
