Patent ID: 7523006
Filing Date: 2009-04-21
Classification: G01N

Abstract:
1. A measuring system for determining a property of an oil from a dielectric property of the oil, comprising: a first sensor for measuring an electric capacitance and a second sensor for measuring a temperature, wherein the first sensor is designed as a dielectric sensor which is immersed in the oil and has a stray-field capacitor which functions as the measuring capacitor, and the second sensor is designed as a temperature sensor which is immersed in the oil; and a compensation device for correcting the measured value of the electric capacitance, taking into account a capacitance reference value measured on an auxiliary capacitor situated in proximity to the measuring capacitor, wherein the corrected measured value of the electric capacitance and the temperature measured by the second sensor are used to determine an ageing state of the oil, wherein the dielectric sensor includes the auxiliary capacitor and on introduction of the dielectric sensor into the oil, the auxiliary capacitor is not immersed in the oil until the measuring capacitor is fully immersed in the oil, wherein feeder lines of the measuring capacitor and the auxiliary capacitor are identical in design and are arranged in mutual symmetry.