2 , 3 wire proximity sensor connection

A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact.Vibration measurements of rotating shafts in machinery.

• Roller Coaster
• Conveyor System
• Mobile Devices
• Touch Screen that come in close proximity to the face
  
   capacitive sensing is a technology, based on capacitive Coupling, that takes human body Capacitance as input. Capacitive sensors detect anything that is conductive or has a dielectric  different from that of air.
  
  Inductive
  An proximity(inductive) sensor is an electrinic Proximity sensor, which detects metallic objects without touching them