How does the proximity switch work? 

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PGCIL DT Electrical 12 March 2022 (NR II) Official Paper
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  1. By sensing magnetic or electrostatic field 
  2. By responding to the change in temperature
  3. By coupling to a moving shaft 
  4. Depending on the liquid or gas vapour

Answer (Detailed Solution Below)

Option 1 : By sensing magnetic or electrostatic field 
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Detailed Solution

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The correct answer is option 1):(By sensing magnetic or electrostatic field )

Concept:

  • Proximity Sensors detect an object without touching it, and they, therefore, do not cause abrasion or damage to the object.
  • Devices such as limit switches detect an object by contacting it, but Proximity Sensors are able to detect the presence of the object electrically, without having to touch it.
  • The proximity switch work By sensing the magnetic or electrostatic field 
  • Proximity sensors are used in phones, recycling plants, self-driving cars, anti-aircraft systems, and assembly lines.
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