The inductive sensor (also commonly known as proximity sensor) is an electronic device that generates a digital or analog signal output in a non-contact manner, when a metal object approaches its active surface, inductively, generating eddy currents and opening or closing the electrical circuit, and during operation the output indicator lights up. Contactless inductive sensors are used in automation for environments where there is high dust, temperature, vibration, and the lack of mechanical contact ensures durability and high reliability.
Main Features of Proximity Sensors
Some of the main features of proximity sensors include:
Switch-on distance - this is the distance between the sensor’s active surface and the approaching metal object, at which an abrupt change of the output signal occurs.
Hysteresis - the difference between the on and off distances.
Speed - represents the time from reaching the switch-on distance to the output modulation.
Types of Proximity Sensors
Depending on the type of voltage supply, the proximity sensors can be DC or AC types. There are special self-learning proximity sensors with microprocessor control unit, linear inductive sensors, sensors for inclination (deviation from a set plane) and more.
Applications of Proximity Sensors
The inductive proximity sensors are suitable for use in various fields of industry and automation, for:
control of moving parts
tracking specific numbers of parts and products
speed and rotation detection
remote machine vibration monitoring
monitoring of active elements such as shafts, bearings, and bushings
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