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What is the sensing range for capacitive proximity sensors?

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What is the sensing range for capacitive proximity sensors?

(a) 150mm

(b) 25mm

(c) 120mm

(d) 100mm

This question was posed to me by my college professor while I was bunking the class.

I'd like to ask this question from Proximity Sensor in section Sensors of IOT

1 Answer

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Correct option is (c) 120mm

To explain I would say: Capacitive Proximity can also detect metals but along with it can also detect resins, liquids, powders, etc. This sensor working can vary accordingly covering material, cable longness, noise sensitivity.Its maximum range of sensing is 25mm.

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