The difference between F, N, and FN coating thickness gauge
F stands for ferrous ferromagnetic substrate. The F-type coating thickness gauge adopts the principle of electromagnetic induction to measure non-ferromagnetic coatings and coatings on ferromagnetic metal substrates such as steel and iron, such as: paint, powder, plastic, rubber, synthetic materials, phosphating layer, chromium, zinc, lead, aluminum, tin, cadmium, porcelain, enamel, oxide layer, etc.
N stands for Non-ferrous non-ferrous substrate. N-type coating thickness gauge adopts the principle of eddy current; to measure the enamel, rubber, paint, plastic layer, etc. on copper, aluminum, zinc, tin and other substrates with eddy current sensors.
The FN type coating thickness gauge adopts both the principle of electromagnetic induction and the principle of eddy current. It is a two-in-one coating thickness gauge of F type and N type.
Function: Measure the thickness of the non-magnetic coating on the magnetic conductive object and the non-conductive coating on the non-magnetic metal substrate
Application: Use magnetic sensors to measure non-ferromagnetic coatings and coatings on ferromagnetic metal substrates such as steel and iron, such as: paint, powder, plastic, rubber, synthetic materials, phosphating layer, chromium, zinc, lead, aluminum, tin, cadmium, porcelain, enamel, oxide layer, etc. Use eddy current sensors to measure enamel, rubber, paint, plastic layers, etc. on copper, aluminum, zinc, tin, etc. substrates. Widely used in manufacturing, metal processing, chemical industry, commodity inspection and other testing fields.
How to use the coating thickness gauge, points for attention
1. Magnetic thickness measurement method: It is suitable for measuring the thickness of the non-magnetic layer on the magnetically conductive material. The magnetically conductive material is 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 magnetic thickness measurement method
3. Ultrasonic thickness measurement method: At present, there is no such method in China to measure the thickness of the coating. Some foreign manufacturers have such an instrument, which is suitable for the measurement of the thickness of the multi-layer coating or the occasion where the above two methods cannot be measured. But the general price is expensive and the 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 and needs to destroy the coating. The general accuracy is not high. It is more troublesome to measure than other types
5. Radiation thickness measurement: this kind of instrument is very expensive), suitable for some special occasions.
