Rochester Hills, MI, United States
Rochester Hills, MI, United States

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Patent
Elcometer | Date: 2015-06-30

A contamination meter (1) for measuring salt concentration on a surface by measuring the electrical resistance of a test medium which has been applied to the surface is disclosed. The meter (1) has at least two electrodes (9) arranged to be brought into contact with the test medium. A measuring device is arranged to measure the electrical resistance of the test medium between one or more pairs of electrodes (9), thereby to measure the electrical resistance of the test medium between the or each pair of electrodes (9) when the electrodes (9) are brought into contact with the test medium. The electrodes (9) are arranged such that, in use, the resistance of the test medium is measurable between pairs of electrodes (9) at different positions on the medium without any relative movement between the medium and the contamination meter (1). The electrodes (9) may be arranged in a grid, and an electrical resistance measurement may be made between any pair of electrodes (9).


Patent
Elcometer | Date: 2017-05-03

A contamination meter (1) for measuring salt concentration on a surface by measuring the electrical resistance of a test medium which has been applied to the surface is disclosed. The meter (1) has at least two electrodes (9) arranged to be brought into contact with the test medium. A measuring device is arranged to measure the electrical resistance of the test medium between one or more pairs of electrodes (9), thereby to measure the electrical resistance of the test medium between the or each pair of electrodes (9) when the electrodes (9) are brought into contact with the test medium. The electrodes (9) are arranged such that, in use, the resistance of the test medium is measurable between pairs of electrodes (9) at different positions on the medium without any relative movement between the medium and the contamination meter (1). The electrodes (9) may be arranged in a grid, and an electrical resistance measurement may be made between any pair of electrodes (9).


Fletcher J.F.,Elcometer
NACE - International Corrosion Conference Series | Year: 2015

Contamination of blast cleaned steel surfaces prior to application of protective coatings leads to premature coating failure resulting from corrosion. It has become common practice to include a salt contamination test prior to the application of the first coat to ensure the required cleanliness. One simple and quick method for this test is the Saturated Filter Paper Method for extracting the salts from the surface with a conductivity meter to assess the resulting sample to determine the concentration of the soluble salts. This method is described in SSPC(1) Guide 15. Testing using this method has shown that soluble salts, particularly sodium chloride crystals, do not spread evenly over a surface and therefore the area tested and the number of tests in a given area are significant in determining if the blasted surface is clean in respect of soluble salts. This paper will discuss the advantages inherent in the saturated paper method compared to other extraction methods and describe how the soluble salt contamination over a significant area can be determined. Reference will be made to the possibility of developing a reference test surface doped with a known concentration of sodium chloride so that the accuracy of testing can be verified. © 2015 by Nace International.


Barnes D.J.,Elcometer
Corrosion Management | Year: 2015

Pull-off adhesion testing is widely used tassess the protective coating process and to determine if a coating is fit for service in new construction and for repairs to existing structures. The result is often critical to the acceptance or rejection of a coating process, as the adhesion value quoted by the paint manufacturer can be adversely affected by aspects of the coating process. Low adhesion values are indicative of premature failure of the coating and are often due to inadequate surface preparation of the substrate. ASTM D4541 and BS EN ISO 4624 describe several different test apparatus; however, the basic approach of gluing a test dolly to the coated surface and then exerting a perpendicular force to the surface in an effort to remove both the dolly and the coating from the substrate is common to all these standards. A measure of the adhesion of the coating system is the force at which the coating fails and the type of failure obtained. Trials have demonstrated that many aspects of the testing method, such as the mixing of the glue, the preparation of the coating surface and the face of the dolly and the temperature of the test, all affect the results.This paper will investigate the effects of any deviation from the proscribed method in every aspect of the test. Each aspect is examined in turn, the results tabulated and the potential effect on a valid adhesion test result is discussed.


Patent
Elcometer | Date: 2013-01-10

A coating thickness measuring instrument has a probe for measuring the thickness of a coating applied to a substrate and producing an output relating to the measured thickness; a memory storing calibration data; and a processor arranged to process the output produced by the probe, together with calibration data stored by the memory, and produce a coating thickness measurement. The memory stores at least two sets of calibration data, each set associated with a different surface profile value and a user may select the set of calibration data to be used by the processor according to the surface profile of the substrate on which a measurement is to be made. This enables a user to make coating thickness measurements on substrates with at least two different, known, surface profiles without having to calibrate the instrument specifically for those surfaces.


Patent
Elcometer | Date: 2014-07-16

A coating thickness measuring instrument has a probe 8 for measuring the thickness of a coating applied to a substrate and producing an output relating to the measured thickness; a memory 5 storing calibration data; and a processor 2 arranged to process the output produced by the probe, together with calibration data stored by the memory, and produce a coating thickness measurement. The memory stores at least two sets of calibration data, each set associated with a different surface profile value and a user may select the set of calibration data to be used by the processor according to the surface profile of the substrate on which a measurement is to be made. This enables a user to make coating thickness measurements on substrates with at least two different, known, surface profiles without having to calibrate the instrument specifically for those surfaces.


Patent
Elcometer | Date: 2013-08-21

A surface profile measurement probe comprising two spaced apart points 20 for contacting a convex surface to be measured and a straight edge or surface 22 moveable relative to the two points to enable the straight edge to be brought into contact with a convex surface contacted by the two points. A tip 10 protrudes from and is moveably mounted relative to the straight edge or surface for measuring the profile of a surface contacted by the straight edge.


Patent
Elcometer | Date: 2013-10-09

A measuring instrument, such as a coating thickness measuring instrument, comprises a reader (6) arranged to read information provided on a calibration piece article (7), such as a calibration foil. The reader (6) can be an RFID reader and the information provided in a RFID tag. The information may be used to calibrate the instrument when the instrument is used to measure a property of the calibration piece. The reader (6) may also be used to read information provided on an article to be measured, to identify the article or a location on the article, or on a detachable probe of the instrument.


Fletcher J.,Elcometer
PPCJ Polymers Paint Colour Journal | Year: 2014

John Fletcher from Elcometer discusses two tests, which can assess the viability of paints after an application has been coated. Two types of apparatus are specified, with type 1 being appropriate for use on test panels of thickness up to 0.3mm and type 2 for use on test panels of thickness up to 1.0mm. These two types of apparatus have been found to give similar results with the same coating but normally only one will be used for testing a given product. The Conical Mandrel Bend Tester consists of a frame with a bending lever with a roller to bend test panels over a cone, which is mounted on a base plate. The coated test panel is bent manually over one or more cylindrical rods of different diameters for this test. The testers have two forms, such as a set of cylindrical mandrels on a stand or a frame with a roller to bend the test panel over a holder that can accommodate any of the set of cylindrical mandrels from 2-32mm.


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