Dry Film Thickness Gauge Introduction
1.Dry film thickness gauge principle and application
Dry film thickness gauges, also known as coating thickness gauges, are used to measure the coating thickness on the metal substrate surface. Common dry film thickness gauge principles are Hall Effect principle and eddy current Effect principle. The instrument using the Hall Effect principle is suitable for the thickness detection of the non-magnetic coating on the surface of the ferromagnetic metal substrate; the instrument using the principle of eddy current Effect is suitable for the thickness detection of the non-conductive coating on the surface of the non-magnetic metal substrate. For example, the dry film thickness gauge is used in the detection of the surface coating thickness of automobile paints and the thickness inspection of steel structure anti-corrosion coatings.
The well-known brand of paint dry film thickness gauges on the market has imported brands QNix and Elcometer. The instruments of these two brands have no disadvantages other than the price point.There are many dry film thickness gauge suppliers in China and various models of dry film thickness gauges from various manufacturers. Different types of instruments are suitable for different industries. Domestic brands of dry film thickness gauges have their own characteristics and there are certain differences in performance and price. More widely used brands such as Linshang and Guoou. Among them, Linshang dry film thickness gauge has 5 different models, which are LS220 and LS220B for automotive paint thickness detection; LS220H and LS221 for coating thickness detection; LS223 suitable for large thickness anti-corrosion fireproof coating thickness detection.
3. Dry film thickness gauge parameters
The technical parameters of the dry film thickness gauge are so many. Take the Linshang dry film thickness gauge LS220B as an example and talk about several important technical parameters:
Probe tip: ruby fixed
Measurement accuracy: ≤ ± (3% reading + 2μm)
Measurement interval: 0.5s
Power supply: 2 sections 1.5V AAA alkaline battery
Working temperature range: 0 ° C -50 ° C
Generally,the performance of a dry film thickness gauge can be seen from several important technical parameters such as material, reaction speed and measurement accuracy. Once the probe is worn,it will directly affect the accuracy of the test. A good dry film thickness gauge uses a ruby probe,which has better wear resistance than a normal metal probe. The measurement interval reflects the response speed of the instrument. The measurement interval of most instruments is about 1 second. A good dry film thickness gauge can test a data for 0.5 seconds.
4. Dry film thickness gauge structure and characteristics
It is distinguished from the structure of the dry film thickness gauge. There are two types of split type and integrated type. There are also interchangeable probes, such as the Linshang LS223 dry film thickness gauge. The integrated dry film thickness gauge is mainly characterized by small size and one-handed grip, which is very convenient for carrying out. The biggest advantage of the split-type dry film thickness gauge is that it can measure some special positions, such as: narrow parts, inside of the box and so on. When testing complex locations with a split dry film thickness gauge, you can also look at the data while testing.
5. Good dry film thickness gauge should meet national standards
As a professional dry film thickness gauge, it has a series of national standards. A good dry film thickness gauge can generally meet various national standards. The Linshang dry film thickness gauge meets the following national standards:
DIN EN ISO 2808 Determination of film thickness for paints and varnishes.
JJG-818-2005 Verification procedure for magnetic and eddy current cover thickness measuring instruments.
GB/T 4956-2003 Measurement of the thickness of non-magnetic coating on magnetic substrates - magnetic method.
GB/T 4957-2003 Non-conductive coating thickness measurement on non-magnetic base metal - eddy current method.
6. Dry film thickness gauge precautions
Dry film thickness gauges also have a range of precautions when used and stored, for example:
It is strictly forbidden to slide the probe on the surface of the car during use, which will result in damage to the paint and the instrument.
When measuring, make sure that the paint surface of the car is clean and the dust on the paint surface will affect the measurement accuracy.
If the instrument displays low power, you need to replace it with a new battery.
When measuring, the probe should be kept at the center of the measured point and the probe should not be suspended outside the tested surface.
Keep away from strong magnets (magnets, stereos, etc.) and strong electromagnetic fields (transformers, induction cookers, etc.).
It is recommended to perform a zero adjustment before the instrument is used.
Avoid contact with corrosive materials and away from high temperature and high humidity.
The above is a detailed introduction to the principle, brand, manufacturer, model, parameters and characteristics of the dry film thickness gauge. I hope that these contents will help you when you purchase a paint dry film thickness gauge.
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