Paint Thickness Meter Measuring Principle and Application

I. Principle of paint thickness meter 

 1. Principle of magnetic thickness measurement

The magnet generates a magnetic field H1 and the Hall device receives the magnetic field generated by the magnet. When the magnet approaches a magnetic metal with a non-magnetic coating, the magnetic field received by the Hall device changes and the output voltage V changes. The thicker the coating, the smaller the voltage V output by the Hall device; the thinner the coating, the greater the voltage output by the Hall device. The coating thickness is determined by accurately measuring the amount of change in the voltage V.

2. Eddy current thickness measurement principle

The eddy current coil passes a high-frequency current I1 to generate a sinusoidal alternating magnetic field H1. When the metal substrate is close to the coil, the metal substrate generates eddy current I2 and the eddy current I2 generates an electromagnetic field H2. The produced electromagnetic field H2 reacts to the coil and changes the coil's Inductance, the coating thickness is judged by accurately measuring the change amount of the inductance.

II. Application of paint thickness meter 

1. Plating process and painting

 This paint thickness meter is widely used in this area, the plating layer thickness is an important indicator of the coating quality, because it will greatly affect the service life of the product.

2. Steel pipe anticorrosion

 The thickness detection of anti-corrosion coatings is important for anti-corrosion management systems. From the practical application point of view, the service life of the coating increases with the increase of the coating thickness. Therefore, increasing the paint layer thickness and improving the protective effect of the coating will be a very important way to increase the service life of the steel pipe. Simply put, the coating thickness is a key indicator of whether the anti-corrosion coating works. Accurately measuring the thickness of anticorrosive coatings will be one of the most critical quality inspection indicators for anticorrosive coatings.

3. Aluminum profile

    In recent years, due to the implementation of compulsory regulations in China and the renewal of licenses by aluminum companies, a new good trend has emerged in this field. The air oxide film on aluminum is mainly measured. According to statistics, each manufacturing company has one μm or one ton less Aluminum material can "save" 150 yuan, which is very considerable. Therefore, China has mandatory regulations to configure relevant testing instruments including paint thickness meters.

  4. Steel frame structure

  According to the specification of "Steel Structure Fireproof Coatings", the quality and classification of steel structure fireproof architectural coatings have been determined. Architectural coating products can be divided into three types: thick, thin and ultra-thin steel frame structures. If the thickness of the steel structure fireproof architectural coating is unqualified, it will not achieve a very good fire safety protection effect. It is also important to inspect the thickness of anticorrosive and fireproof safety coatings for steel structures.

5. Packaging printing route plate, ink printing and other fields:

There are various routes on the package printed circuit board, so moisture, corrosion and water resistance become the key to coating on the package printed circuit board. Because once these three processes have the same quality or the coating is not qualified, it will endanger the function of the electronic equipment and even short-circuit failure, which may cause damage to the electronic equipment when it is more serious. The requirements for the thickness inspection of anti-corrosion coatings for packaging and printing route plates have also gradually increased.

III.  Selection of paint thickness meter 

Linshang paint thickness meters are widely used in automotive paint surface thickness inspection, hardware surface coating thickness inspection, anti-corrosion coating thickness inspection and other industries. The main parameters and features of different models and specifications are selected as follows: