The The MZC1/ RZC1 are C-slot sensors that eliminate false signals 5 times better than common sensors. The drop-in mount and attached captive screw reduce installation, replacement and maintenance time, which increase productivity in manufacturing plants. are C-slot sensors that eliminate false signals 5 times better than common sensors. The drop-in mount and attached captive screw reduce installation, replacement and maintenance time, which increase productivity in manufacturing plants.