US Patent 11417182 Contact sensor with masking detection feature

A contact sensor includes a permanent magnet, first and second magnetic field sensors, and a computing device in communication with the first and second magnetic field sensors and configured to execute an “Open/Close” function to generate an “Open/Close” decision, and a “Masking” function to generate a “Masking” decision, based on at least one of a first measurement from the first magnetic field sensor or a second measurement from the second magnetic field sensor.