We have a Larox filter press that uses a continuous piece of cloth (joined at the ends by a metal seam). We need to be able to detect where this metal seam is to be able to stop the cloth so that the metal seam is on the outside of some drive rollers. The filter press is controlled by a Modiocn 984. The filter press recovers solids out of a slurry and the environment is pretty sloppy. Any help would be greatly appreciated.