"Non-Contact Safety Switches are easy to install and offer wear free, control reliable switching which is vibration resistant and easy to clean. Both magnetic and RFID versions are available. The RFID types are available in unique or multiple coding with on board diagnostics. These units offer an OSSD solid state output, which can be used with a safety relay or for standalone applications. Remote monitoring through a separate diagnostic channel is available. Up to 32 switch can be run in series using plug in connectors."