Patent ID: 8933709
Filing Date: 2015-01-13
Classification: G01F,G01R

Abstract:
1. A method for determining residual coupling of an inductive, conductivity sensor, in which the conductivity sensor is surrounded by a measured medium and an equivalent impedance of the medium is calibrated with a variable compensation impedance; wherein the variable compensation impedance and the equivalent impedance of the medium act on a measuring coil of the conductivity sensor with a phase shift of 180°, comprising the step of: varying the variable compensation impedance until an output voltage of the measuring coil of the conductivity sensor assumes a minimum voltage wherein: the complex minimum voltage corresponds to the residual coupling of the inductive, conductivity sensor; the equivalent impedance of the medium is a component of a measuring conductor loop of the conductivity sensor, while the variable compensation impedance is arranged in a reference conductor loop of the inductive, conductivity sensor; and the reference conductor loop is turned on and, respectively, off during operation of the inductive, conductivity sensor.