One lens shield included in every PosiTector purchase. Ideal for use on thin, soft coatings to protect unnecessary wear while using Scan or Fast mode to measure large objects.
The rich text element allows you to create and format headings, paragraphs, blockquotes, images, and video all in one place instead of having to add and format them individually. Just double-click and easily create content. A rich text element can be used with static or dynamic content. For static content, just drop it into any page and begin editing.
For dynamic content, add a rich text field to any collection and then connect a rich text element to that field in the settings panel. Headings, paragraphs, blockquotes, figures, images, and figure captions can all be styled after a class is added to the rich text element using the "When inside of" nested selector system. Eddy current techniques are used to nondestructively measure the thickness of nonconductive coatings on nonferrous metal substrates.
A coil of fine wire conducting a high-frequency alternating current above 1 MHz is used to set up an alternating magnetic field at the surface of the instrument's probe.
When the probe is brought near a conductive surface, the alternating magnetic field will set up eddy currents on the surface.
The substrate characteristics and the distance of the probe from the substrate the coating thickness affect the magnitude of the eddy currents. The eddy currents create their own opposing electromagnetic field that can be sensed by the exciting coil or by a second, adjacent coil. Magnetic film gages are used to non-destructively measure the thickness of a nonmagnetic coating on ferrous substrates.
Most coatings on steel and iron are measured this way. Magnetic pull-off gages use a permanent magnet, a calibrated spring, and a graduated scale. The attraction between the magnet and magnetic steel pulls the two together. As the coating thickness separating the two increases, it becomes easier to pull the magnet away.
Coating thickness is determined by measuring this pull-off force. Thinner coatings will have stronger magnetic attraction while thicker films will have comparatively less magnetic attraction. Testing with magnetic gages is sensitive to surface roughness, curvature, substrate thickness, and the make up of the metal alloy. Magnetic induction instruments use a permanent magnet as the source of the magnetic field. A Hall-effect generator or magneto-resistor is used to sense the magnetic flux density at a pole of the magnet.
Electromagnetic induction instruments use an alternating magnetic field. A soft, ferromagnetic rod wound with a coil of fine wire is used to produce a magnetic field.
A second coil of wire is used to detect changes in magnetic flux. These electronic instruments measure the change in magnetic flux density at the surface of a magnetic probe as it nears a steel surface. The magnitude of the flux density at the probe surface is directly related to the distance from the steel substrate. By measuring flux density the coating thickness can be determined. Ready to measure—no adjustment required for most applications NEW Larger 2. USB cable included.
See probe compatibility chart for more information. Includes ALL features as shown on left plus View More Features. Includes the features of the standard gage, with storage of , readings in up to 1, batches. Includes WiFi and Bluetooth. Step 2: Choose material type Ferrous. Step 3: Select a model Click model to download cutsheet. Our most popular Integral and Regular cabled probe models.
Measuring Range:. In Stock. Microprobes — Our smallest probes for small parts or hard-to-reach areas. Integral and Cabled probes for thick protective coatings; epoxy, rubber, intumescent fireproofing and more.
New PosiTector Gage Body. PosiTector SmartLink. Coating Thickness Instruments Overview. PosiSoft Desktop. Click here to learn more about PosiSoft. PosiTector App. PosiSoft USB. PosiTector Developer Resources.
PosiTector paint thickness probes have different capabilities depending on the model. FS1 can measure non-magnetic coatings applied to ferrous magnetic metals, typically carbon steel. NRS3 can measure non-conductive coatings applied to non-ferrous metals. FNTS1 can measure non-magnetic coatings applied to ferrous magnetic metals, AND non-conductive coatings applied to non-ferrous metals.
Electroless nickel coatings are deposited by an autocatalytic process which does not involve the addition of an electric current. A mil, also known as a Thou, is equal to 1 one-thousandth of an inch Convenient hard shell case for carrying a PosiTector gage body and multiple probes. View More Accessories. PosiTector Literature. PosiTector Instruction Manual. PosiTector On-gage Help Reference. How to measure coating thickness on stainless steel with DeFelsko coating thickness gauges.
Measuring Spray-on Truck Bedliner Thickness. Calibration, Verification, and Adjustment. This paper explains often-misunderstood steps in the process of ensuring accurate inspection measurements. This article details the use of DeFelsko Coating Thickness Gages within the zinc galvanizing industry.
Duplex Coating System Thickness Measurement. The PosiTector FNDS coating thickness gage measures individual thicknesses of both paint and zinc layers in a duplex coating system simultaneously. Calibration Terms - Coating Thickness Gages.
This discussion provides definitions, explanations, limitations and practical examples of metrology terminology relating to Coating Thickness Measurement gages.
Measurement Terms - Coating Thickness Gages. Coating thickness is an important variable that plays a role in product quality, process control, and cost control. DeFelsko manufactures hand-held, non-destructive coating thickness gages that are ideal for measuring the wear of Organophotoconductor OPC Drums.
Screen Printing - Measurements mesh, emulsion, stencil thickness. The PosiTector FS accurately and non-destructively measures mesh, emulsion and stencil thickness, as well as substrate and dry ink deposit thickness. This article describes powder coating thickness measurement solutions and lists appropriate ASTM standards testing documents. Powder coating thickness measurements can be taken before and after curing. Substrate type, powder coating thickness range, part shape, and economics determine the best method to be employed.
For uncured applied powders, height measurement can be performed with powder combs and with magnetic coating thickness gages employing special powder probes.
These techniques are destructive and may require recoating the part. Coating powders generally diminish in thickness during the curing process so these procedures require a reduction factor be determined to predict cured film thickness. Ultrasonic instruments also measure uncured powder , but do so without touching the surface.
Instead of measuring powder height, they automatically display a predicted cured thickness result. For after-cure measurement, a variety of hand held instruments are available. These non-destructive instruments employ either magnetic, eddy current, or ultrasonic principles depending on the substrate. Less common methods include micrometer measurement, destructive dry film methods such as cross-sectioning, and gravimetric mass measurement.
We begin with a discussion of post-cure measurement simply because cured thickness targets are the values most often supplied by both powder manufacturers and coating specifiers. Dry film thickness DFT instruments are common, affordable, non-destructive, and easy to operate. They employ magnetic, eddy current, or ultrasonic principles depending on the substrate.
Three principles of operation are employed. A magnetic principle is used to measure non-magnetic coatings on steel parts. For the other metals, such as aluminum, an eddy current principle is used provided the coating is non-conductive.
For non-metals, an ultrasonic principle is used. When the part is made of steel, measurements are made with a magnetic thickness gage using either mechanical or electronic operation.
Mechanical pull-off gages use a permanent magnet. Cured thickness is determined by measuring the force required to pull that magnet from the coated steel surface. Magnetic pull-off gages are rugged, simple, inexpensive, portable, and usually do not require any calibration adjustment.
They are a good, low-cost alternative in situations where quality goals require only a few readings during production. DeFelsko manufactures two mechanical instruments.
The PosiTest FM is a rollback dial model comprised of a magnet attached to one end of a pivoting balanced arm and connected to a calibrated hairspring. By rotating the dial with a finger, the spring increases the force on the magnet and pulls it from the surface. It is safe in explosive environments and is commonly used by painting contractors and small powder coating operations. Pencil-type models, like our PosiPen , use a magnet that is mounted to a helical spring that works perpendicularly to the coated surface.
Ideal for small parts or for quick quality checks, the PosiPen has a smaller probe tip allowing it to be placed with pin-point accuracy on small parts, hard to reach areas and curved surfaces. A variety of electronic instruments are available for measuring after cure powder coating thickness on metal parts. They use a magnetic principle when measuring on steel and an eddy-current principle on aluminum. Measurement results are displayed on an easy-to-read liquid crystal display LCD. Two models are available, each capable of measuring up to microns 40 mils.
Our most popular instruments for powder coaters are the PosiTector series of gages. They are ideal for the non-destructive measurement of powder coating thickness on metal substrates. Various models of the PosiTector are available including an F series for steel substrates, an N series for non-steel substrates such as aluminum, and an FN series for measuring either application. Higher accuracy ferrous or non-ferrous Microprobes , with a range up to microns 25 mils , are available for measuring in smaller, hard to reach areas.
Advanced models can store, print, and download readings. As more customers purchase coating thickness gages to verify the quality of incoming products, it is becoming increasingly important that powder coaters have the ability to permanently record quality control data. Some powder coaters have even taken the next step of providing their customers with unsolicited reports showing the coating thickness readings as evidence of their process quality.
ASTM D describes non-destructive measurements over metal substrates made with magnetic and eddy current coating thickness gages. Magnetic and eddy current instruments measure powder over metals. Non-metal applications such as coated plastic and wood require an ultrasonic pulse-echo technique. Ultrasonic testing works by sending an ultrasonic pulse into a coating using a probe transducer with the assistance of a gel or drop of water temporarily applied to the surface.
This relatively new advancement allows industries to perform non-destructive quality control at an affordable price. A benefit of this measurement technique is the possibility of measuring the individual layers in a multi-layer coating system.
Our ultrasonic PosiTector B is ideal for measuring the thickness of powder coating applied to non-metal substrates.
ASTM D describes this test. Micrometers are sometimes used to check coating thickness. Two measurements must be taken: one with the coating in place and the other without. The difference between the two readings, the height variation, is taken to be the coating thickness. Two destructive techniques are available. One is to cut the coated part in a cross section and measure the film thickness by viewing the cut microscopically. The other technique uses a scaled microscope to view a geometric incision through the cured coating.
This method is used when nondestructive methods are not possible or as a way of confirming nondestructive results. ASTM Test Method D describes destructive measurements over rigid substrates made with cross-sectioning instruments.
Measurement methods described so far take place after the powder coating has cured. But if a coating has been improperly applied, correction after cure requires costly extra labor time, may lead to contamination of the film, and may introduce problems of adhesion and integrity of the coating system.
Measuring film thickness before cure can determine the need for immediate correction and adjustment by the applicator. While most powder coating specifications give cured thickness targets, it is possible to determine if applied powder is within thickness specifications before the finality of curing and crosslinking.
There are good reasons for wanting an accurate prediction of cured thickness, especially on moving lines. Depending upon the length of the oven, that is, the number of parts being cured, as well as the time required for the curing process and for manual film thickness measurement after curing, there is a considerable delay before the operator can intervene in the application process to make any necessary changes.
If coating defects are discovered, a considerable number of coated parts have to be reworked in a repair loop or, if reworking proves to be too expensive, they may even have to be scrapped. For some operations, these disadvantages are no longer acceptable for meeting the demands of modern finishing processes. Measuring powder in the pre-cured, pre-gelled state helps ensure correct cured film thickness.
It enables the application system to be set up and fine-tuned prior to curing. In turn, this will reduce the amount of scrap and over-spray. Accurate predictions help avoid stripping and re-coating which can cause problems with adhesion and coating integrity. ASTM D describes three measurement methods for the thickness of applied, pre-cured coating powders to predict a cured thickness. Procedure A uses gauges such as the inexpensive DeFelsko Powder Comb which works much the same way as a wet film thickness gage.
The comb is dragged through the uncured powder and powder height is considered to be a range value between the highest numbered tooth that made a mark and has powder clinging to it, and the next highest tooth that left no mark and has no powder clinging to it. These gages are relatively inexpensive. Various Powder Comb models are available allowing measurements from 75 to microns 3 to 50 mils on any substrate. They are only suitable as a guide since the cured film may be different after flow.
Marks left by the gage may affect the characteristics of the cured film. Procedure B uses a conventional magnetic or eddy current coating thickness gage but with a specially designed powder probe to measure the thickness of the coating powder. Three micro pins, which are integrated into the probe, penetrate the coating powder down to the substrate.
0コメント