CHECKING UNIT AND METHOD FOR CALIBRATING A CHECKING UNIT

摘要

The invention relates to a checking unit for checking a material web and to acalibrating method for the checking unit. The checking unit is equipped withdrivemeans for transporting the calibration medium past the checking unit in ordertodetect a multiplicity of measurement values of the calibration medium. Thedrivemeans are arranged in the housing of the checking unit in order for the drivemeans to be protected from moisture or contaminants from the environment. Toobtain a transporting of the calibration medium past the checking unit inspite ofthe arrangement of the drive means in the housing, drive means are employedthatare configured for a contactless interaction with the calibration medium andcantransport the calibration medium past the checking unit contactlessly. Forthispurpose there is preferably used a magnetic interaction between the drivemeansand the calibration medium.