These inductive proximity sensors provide an output current directly or reversely
proportional to the distance between the sensing face and the metal target. The
output current is also dependent by the material of the target, so they can be
used not only to detect distances, displacements, vibrations and wavings but
also to recognize the composition of metals and alloys. In the two wires configuration,
they are reversal polarity and short circuit protected devices compliant to
the 4-20 mA industrial standard.