Definition of Inductive Proximity Switch
A proximity switch refers to a switch device that diverts power to a circuit based on the presence of nearby objects. Inductive proximity switches operate via the same principle, but detect metal objects only. Does this Spark an idea?
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Induction Loop
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The inductive proximity switch contains a sensor, which in turn houses an induction loop. Induction loops refer to a kind of electromagnetic detection system which induces current in a wire based on the movement of a magnet.
Process
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A current charges a coil in the inductive proximity sensor, which is measured via an electronic circuit. The coil also generates a magnetic field. If a metallic object comes in close proximity to this coil's magnetic field, the current increases, causing the inductive proximity switch to either close or open.
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Limitations
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Although advantageous in areas where access is limited, the sensing range of an inductive proximity switch averages only six centimeters. Inductive proximity switches also lack directionality, or cannot operate based on the specific direction of an incoming object.
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References
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- Photo Credit switch image by Clark Duffy from Fotolia.com
