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Ab proximity sensors.
A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact.
A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation infrared for instance and looks for changes in the field or return signal the object being sensed is often referred to as the proximity sensor s target.
A inductive proximity sensor can detect metal targets approaching the sensor without physical contact with the target.
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Proximity sensors can have a high reliability and long functional life because of the absence of mechanical parts and lack of physical contact between the sensor and the sensed object.
Choose from our selection of proximity sensors including dc metallic object proximity switches dc universal object proximity switches and more.
Our inductive proximity sensors detect metal objects without touching them.
This technology is used in applications where the metal object to be detected is within an inch or two of the sensor face.
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For the reasons above proximity sensors are very popular in industrial.
Wikipedia article on proximity sensors advantages of solid state proximity sensors.