Packaged in a rugged metal, tamper-proof housing, MLV41-8-HV operates with both foreground suppression and background suppression. This unique operating mode means it does not incorrectly sense a torn piece of paper that falls on its face (in the sensing foreground), nor does it detect a machine panel behind the web (in the sensing background).
Using an innovative lens contamination system, the MLV41-8-HV has a secondary sensor independent from the web detection sensor. This second sensor, depicted in the red circle in the image, is a patented technology exclusive to Pepperl+Fuchs. Dust, fibers, or paint particles from printing, which normally impede the performance of a web break sensor especially when it faces upward, are detected and a secondary sensor output signals that the lens should be cleaned. Without this unique function, dust could accumulate on the sensor's face in amounts large enough to prevent the sensor from detecting the web.