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Improving Coating Weight Measurement for Heavy Coatings
On-line coating weight measurement accuracy is very important in
reducing zinc consumption and insuring that the customer gets the coating weight ordered. On-line coating weight gauge
systems over the years have developed accurate measurement of lower coating weights (G25 to G90 – 38 to 138 gsm/side),
however accuracy in the upper range (G100 to G235 – 152 to 358 gsm/side) has been very difficult as the measurement system
reaches its upper range capability. California Steel Industries recently installed IRM coating weight systems in the cooling
tower of their #1 and #2 Continuous Galvanize Lines. CSI worked jointly with IRM to improve the calibration accuracy of this
measurement system specific to their product and line conditions. Factors affecting the measurement accuracy including
calibration curve order effects, sample accuracy, calibration methodology, pass line deviation, and temperature compensation
are discussed.
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