Patent ID: 7064536

Claim:
Transducer for distance measurement, between a stator and a rotor in a refiner for paper pulp production, in which the transducer is of the magnetic type and has a tubular casing ( 17 ) at one end of which a measuring pole ( 15 ) interacting with measuring windings ( 19 – 21 ) inside the casing is fixed by means of a holder ( 16 ) of non-magnetic material which seals the end of the casing, characterized in that the holder ( 16 ), with a first portion ( 22 ) of its axial length, reaches axially beyond the end of the casing ( 17 ), that this first portion ( 22 ) of the holder connects to the end of the casing ( 17 ) and at least partially covers said end, and in that this first portion ( 22 ) and the measuring pole ( 15 ) are intended to be able to be worn away to a smaller axial length during use of the transducer, whilst the length of the casing is maintained.