Measurement Products - SFXR-6 Metallic Coating Sensor

SenTek Coating Mass Control

SenTek's Coat Weight System now also features a pressure and distance control for setting, tracking, and correcting coating mass based on preset variables and gauge feedback on air knife pairs at Hot Dip Galvanizing lines. The control system is a parametric algorithm with limited degrees of freedom for the air knife distance setup. Fine adjustment of coating mass is done continuously with air knife pressure, while air knife distance is maintained at the setting required for each control parameter group.

The control program features a LEARN mode (sometimes known as a "Shadow Mode"), where control action is displayed but not passed on to the air knife. In this mode the model compares the control action to the predicted results and sets up corrective coefficients that "teach" the model about any changed behavior in the process.

At each coat weight setting, a knife distance is chosen and held, while the pressure is continuously varied to maintain control.