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Coating Thickness Measurement

In hot-dip and electrolytic galvanizing lines the RS-40 x-ray fluorescence gauges are installed for non-contact, continuous and precise measurement of the coating thickness.

The gauge-heads for the measurement of top and bottom face can be mounted on a double beam, O-frame type scanner for measurement against the free running strip or can be supplied with individual single beam scanners for measurement against a roll.

In hot-dip galvanizing lines the RS-40 X-ray coating weight gauge can be supplied for the so-called hot, warm and cold positions. The gauges for the different locations differ mainly in the cooling capacity and the thermal insulation of the gauge-heads. For the hot position customer specific mechanics are supplied.
Like all Rayonic sources and sensors the RS-40 gauge-heads have a robust stainless steel housing that contains the x-ray source with a metal-ceramic tube, the high voltage generator and emission control and the detector modules with application specific pre-filters.

Zinc Tin Nickel
Processing Line Tot-Dip Galvanizing Hot-Dip and Electrolytic Galvanizing Electroplating
Type Hot, Warm and Cold Gauge O-Frame Scanner or Single Beams O-Frame Scanner or Single Beams
Operating Parameters 32 kV / 0,6 mA 25 kV / 0,8 mA 32 kV / 0,6 mA
Measurement Range 10 - 350 g/m² 0,01 - 5,0 um 0,01 - 10,0 um
Measurement Gap 30 - 60 mm 40 mm 40 mm
Accuracy 0,10% 0,10% 0,10%


Metal coatings that are frequently measured with the RS-40 gauge are:

zinc and zinc alloys (Zn/Ni, Zn/Al), aluminum and tin.

Other typical applications are copper, brass, nickel, cobalt and chrome coatings. For alloys like Zn/Al the composition of the alloy can optionally be determined in addition to the total coating thickness. For galvannealed coatings the iron-content is measured together with the coating thickness.