How to Choose Dry Film Thickness Gauge?

From:Linshang Time:2020/04/08 10:00:00 Browse:479
The change of film thickness will affect various properties of the product, including color, gloss, hardness, adhesion, scratch resistance, etc. In order to ensure the coating performance, you must use a professional film thickness gauge to measure its thickness.
Dry film thickness gauge test fireproof coating thickness
Dry film thickness gauge test fireproof coating thickness

I. What is dry film thickness gauge?

Definition: Dry film thickness gauge is a small portable instrument, also known as coating thickness gauge, coating thickness meter, paint thickness gauge. Dry film thickness gauge is an instrument for measuring the thickness of dry film on metal or non-metal substrates.

Principle: The dry film thickness gauge adopts magnetic or eddy current measurement methods. The magnetic induction dry film thickness gauge can non-destructively measure the non-magnetic coating layer thickness (such as aluminum, chromium, copper, copper, enamel, rubber, paint, etc.) on the magnetic substrate; the eddy current dry film thickness gauge can non-destructively measure the non-conductive covering layer thickness (such as enamel, rubber, paint, plastic, etc.) on the non-magnetic metal substrate (such as copper, aluminum, zinc, tin, etc.).

Function: Some dry film thickness gauges only display measured values, while some more advanced dry film thickness gauges can store hundreds of readings, can store data and export. Dry film thickness is important in the coating industry because it is the determinant of the quality, reliability and service life of the coated product or structure.

II. Dry film thickness gauge for use on ferrous or non-ferrous metal substrates

● Measuring principle: magnetic induction and eddy current measuring principle
● Range: 0.0-2000μm
● Measurement accuracy: ≤ ± (3% reading + 2μm)
● Measurement speed: 0.5S out of a data
Price: $118
Model: LS220H
● Measuring principle: magnetic induction and eddy current measuring principle
● Range: 0.0-2000μm
● Measurement accuracy: ≤ ± (3% reading + 2μm)
● Measurement speed: 0.5S out of a data
Price: $148
Model: LS221
● Measuring principle: magnetic induction and eddy current measuring principle
● Range: Fe: 0.0-5000μm; NFe: 0.0-3000μm
● Measurement accuracy: ≤ ± (3% reading + 2μm)
● Measurement speed: 0.5S out of a data
Price: $190
Model: LS223
● Measuring principle: magnetic induction measuring principle
● Range: 0.0-500μm
● Measurement accuracy: ± (0.3μm + 2%) five-point calibration
● Measurement speed: 1.5S out of a data
Price: $760
Model: LS225+F500

III. Why dry film thickness measurement is important?

1. What is a dry film?

Dry film refers to dry paint film (paint film), also known as paint film. A solid continuous film formed by one or more coats of paint applied to a substrate. Generally, the paint film is composed of multiple coats. The amount of coating is determined according to the requirements of the object to be coated. Generally including primer layer, intermediate coating and topcoat layer. It is widely used in the chemical industry. 

2. Why do we measure dry film thickness?

A. The function of dry film or coating

Dry film thickness (DFT) or coating thickness can be said to be an important factor affecting coating performance. With the help of the dry film thickness gauge, the film thickness can be controlled within the error range expected by the paint manufacturer. Appropriate film thickness can ensure the best product performance. Film thickness is an important process parameter that must be measured regularly. The film thickness will affect the appearance of the coating and the protective properties of the coating.

B. The function of fireproof paint and anti-corrosion coating

Taking fireproof paint as an example, if the fireproof paint thickness does not reach the standard, its fireproof performance may be greatly reduced. If the fireproof coating is too thick, it may cause excessive drying time, cracking and peeling of the paint film. Similarly, the anti-corrosion coating thickness is also an important factor affecting the performance of the coating. If the coating is too thin, the anti-corrosion performance of the coating decreases; if the coating is too thick, the anti-corrosion coating may come off. The same is true for other types of coatings.

C. The necessity of controlling dry film thickness

Regular film thickness measurement helps control material costs, manage construction efficiency, maintain paint quality and ensure compliance with contract specifications. Controlling the film thickness in the optimal range helps the coating achieve the best performance. 

D. Dry film thickness measurement method and principle

There are two methods for measuring the coating thickness with a dry film thickness gauge: non-destructive measurement and destructive measurement. Non-destructive measurement will not damage the coating, so most people take the non-destructive measurement method. Non-destructive measurement includes two methods: the magnetic induction measurement principle for the non-magnetic coating thickness measurement on magnetic metal substrate and for the coating thickness measurement on the non-ferrous substrate, we recommend the eddy current measurement principle.

IV. How to measure dry film thickness using a dry film thickness gauge?

1. How to use the dry film thickness gauge?

  1. When measuring paint thickness, many people don’t know how to use the dry film thickness gauge. Here, we take Linshang dry film thickness gauge as an example to demonstrate how to use dry film thickness gauge for coating thickness measurement. In the off state, long press the power button to enter the setting mode, you can set the measurement mode, unit and language.

  2. Before the measurement, you can select the appropriate measurement mode-iron-based (Fe), non-ferrous-based (NFe) and automatic identification (Fe / NFe) according to the nature of the measured material. It is generally recommended to select the automatic measurement mode.

  3. Perform zero adjustment before using Linshang dry film thickness gauge. There is no need for calibration. Press the probe tightly on the zero adjustment board, short press the power button and lift the probe up to more than 15cm according to the prompt. The screen displays 0, that is, zero adjustment is completed.

  4. When measuring, hold the groove part of the instrument with your fingers and press the probe tightly on the surface of the measured object, the film thickness will be displayed on the instrument screen immediately. The measurement speed of Linshang dry film thickness gauge is really fast and a data can be output in 0.5S.

How to make zero adjustment of LS220 coating thickness gauge?

2. Precautions for the use of dry film thickness gauge

  1. When using the dry film thickness gauge, pay attention to hold the groove by hand.

  2. After holding the groove part by hand, press the probe vertically on the surface of the measured object without tilting or shaking.

  3. When measuring, do not select the edge area.

  4. The roughness of the workpiece surface is too large and there are too many attachments, which is not conducive to the probe directly contacting the surface of the measured object and will also affect the measurement. Therefore, before the measurement, the attachment on the measured object surface needs to be cleaned up.

V. How to choose right dry film thickness gauge?

1. Choose the right dry film thickness gauge supplier and brand

Before buying a dry film thickness gauge, we usually choose regular products and strong dry film thickness gauge manufacturers. Only dry film thickness gauge manufacturers with R & D strength and formal production departments can provide customers with protection. Taking Linshang Technology, a manufacturer of dry film thickness gauges as an example, Linshang Technology has a strong R & D team and a lean production process. If you are confused about what kind of instrument you should choose. Our R & D staff will answer your questions as soon as possible. If there is any problem with the dry film thickness gauge, you can send the instrument to the manufacturer for repair.

2. Choose the appropriate dry film thickness gauge according to the dry film thickness

The measurement range of the dry film thickness gauge is also an important factor that affects the customer's purchase. The price of the dry film thickness gauge in different ranges is also different. Dry film thickness gauges with large ranges are usually relatively expensive. Linshang Technology, as a professional dry film thickness gauge manufacturer, has developed dry film thickness gauges with different ranges from 0 to 5000 μm according to the measurement needs of customers.

3. Choose dry film thickness gauge according to the measurement occasion

If you need to measure coating thickness within small area, we usually need one hand to test with the probe and the other hand to hold the host to observe the data. It is recommended to choose Linshang split dry film thickness gauge, LS221, LS223, LS225. If one-handed testing is required, it is recommended to choose LS220H.

4. Choose dry film thickness gauge according to the price

The dry film thickness gauge price is an issue that most customers care about. The dry film thickness gauge prices on the market ranges from several thousand to ten thousand. In addition to understanding their own measurement needs and the function of the dry film thickness gauge, customers usually want to choose a cost-effective instrument. The price range of Linshang Thickness Gauge is $118-$280. This price is neither expensive nor cheap in the market. 

As a professional dry film thickness gauge manufacturer, Linshang Technology is committed to providing the best price while ensuring the performance of the instrument. If only to pursue the price and reduce the performance of the dry film thickness gauge, it is not worth the loss. Some dry film thickness gauge cost thousands of dollars. The price of this dry film thickness gauge exceeds the budget of most customers. Now more and more customers support the Chinese dry film thickness gauge, we believe the performance of the Chinese dry film thickness gauge will not let everyone down.