This preview shows page 1. Sign up to view the full content.
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...
View Full Document
This note was uploaded on 11/01/2012 for the course CHEMICAL 102 taught by Professor Jamesrodriguez during the Spring '12 term at Universidad Politécnica de Cartagena.
- Spring '12