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Their disadvantage compared to non flush fitting

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Unformatted text preview: at least three times the nominal switching distance of the proximity sensor used. The free zone is the area between the proximity sensor and a background object. The advantage of flush-fitting proximity sensors is that these are very easy to install and space saving. Their disadvantage compared to non-flush-fitting proximity sensors is that although the external diameter of the proximity sensor housing is identical, the switching distance is smaller. F3 d F2 F1 Diameter of proximity sensor (d) Nominal switching distance (sn) Free zone 1 = 3 x sn (F1) Free zone 2 ≥ 3 x sn (F2) Free zone 3 ≥ 2 x sn (F3) Fig 4.3.2: Non-flush fitting inductive proximity sensors Recessed proximity sensors which are mounted in a material which influences their characteristics (metal) require a free zone which surrounds the entire active area. However, these proximity sensors can be embedded in plastics, wood or other nonmetallic materials without the characteristics of the proximity sensor being affected. This type of sensor can often be recognised by the coil head protruding from the housing of the proximity sensor. 54 ...
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