Keywords
Citation
(2002), "Coating thickness measurement", Anti-Corrosion Methods and Materials, Vol. 49 No. 6. https://doi.org/10.1108/acmm.2002.12849fad.007
Publisher
:Emerald Group Publishing Limited
Copyright © 2002, MCB UP Limited
Coating thickness measurement
Coating thickness measurement
Keywords: Coatings, Measurement, Colour
The “eXacto” coating thickness gauge – manufactured by ElektroPhysik and available exclusively in the UK from Sheen Instruments Ltd – is said to provide an easy-to-use and precise method of measuring the thickness of coatings on ferrous or non-ferrous substrates, in situ or in the laboratory (Plate 3).
Compact and lightweight (only 200 g), the eXacto gauge features a user-friendly menu for easy access of single value statistics, including the number of readings, mean value, standard deviation, and minimum/maximum values, or block value statistics, including the number of readings per block, mean value and standard deviation per block. The data memory can store up to 90 single readings or 45 block values.
Plate 3 The eXacto coating
thickness gauge
For quality assessment, a limit value is available for monitoring user-selectable tolerances, plus an alarm signal to indicate when set tolerances are exceeded.
The gauge operates by means of an integral “smart” magnetic-induction or eddy-current probe, which detects automatically whether the substrate metal is ferrous or non-ferrous, and is available in three variants: type “F” (magnetic induction probe) for measurements on steel, type “N” (eddy-current probe), and type “FN”, which has a dual function probe.
Measurement range of the “F” model is 0 to 3,000 μm (120 mils) and for the “N” and “FN” models is 0 to 2,000 μm (80 mils). Accuracy of all models is ±2 μm + 3 per cent of reading (±0.08 mils + 3 per cent of reading).
An additional feature of the eXacto gauge is a special housing to store calibration standards so that calibration foils or a zero plate are quickly available to verify gauge accuracy.
Details available from: Sheen Instruments Ltd, Tel: +44 (0) 20 8541 4333; Fax: +44 (0) 20 8549 3374; E-mail: info@sheeninstruments.com; Web site: www.sheeninstruments.com