The MLV41-8-HV web break detection sensor is a photoelectric sensor designed to monitor a web or sheet of media, such as paper, reflective or glossy printed material, adhesive films, and packaging material. It is critical to quickly respond to a tear or web break in order to immediately identify and stop the web movement to minimize the amount of scrapped media and ink. Reliable web break detection also reduces downtime, as the torn web can be spliced together and doesn't have to be fed through the entire printing or converting machine again, which saves time and labor costs.
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.