Patent ID: 6818111
Filing Date: 2004-11-16
Classification: G01N

Abstract:
A probe for determining an oxygen concentration in a gas mixture, comprising:a Nernst measuring cell including: a Nernst electrode exposed to the gas mixture to be measured via a diffusion barrier, a reference electrode exposed to a reference gas, and a solid electrolyte body arranged between the Nernst electrode and the reference electrode; a pump cell including: an inner pump electrode exposed to the gas mixture via the diffusion barrier, an outer pump electrode exposed to the gas mixture, and a solid electrolyte body arranged between the inner pump electrode and the outer pump electrode; a joint supply conductor section through which the Nernst electrode and the inner pump electrode are connected to a circuit arrangement for controlling and evaluating the probe; and a loaded voltage divider including a plurality of resistors that are arranged such that a negative feedback of a Nernst voltage circuit and of a pump voltage circuit is optimized, the plurality of resistors including a joint supply conductor resistor associated with the Nernst electrode and the inner pump electrode; wherein magnitudes of the plurality of resistors are chosen so as to reduce a rippling effect at a stoichiometric point.