Patent ID: 7479789
Filing Date: 2009-01-20
Classification: G01N

Abstract:
1. Method for measuring the degree of fiber concentration in a pulp inside a machine, in particular a refiner for the manufacture of paper pulp, which machine comprises a stator and an opposing rotor, which form a grinding gap for the pulp, with the stator being provided with at least one sensor device, designed to interact with a rotor surface and comprising an impedance meter body with a sensor surface, which impedance meter body is mounted in the stator in such a way that it can move axially, wherein measurements of the impedance between the rotor surface and the sensor surface are carried out during an axial movement of the impedance meter body and wherein the measured inpedance differences are utilized together with the size of the movement to determine the dielectric constant of the pulp, from which the degree of fiber concentration of the pulp is derived.