Method for testing a measuring sensor
AssigneeRobert Bosch GmbH
InventorsLothar Diehl, Alexander Bareiss
Life of this patent
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Abstract
In a method for testing a measuring sensor for the determination of an oxygen concentration in a gas mixture, the measuring sensor supplies a detection voltage furnished by a Nernst measuring cell and corresponding to the oxygen concentration. The detection voltage is evaluated by a circuit arrangement and is picked off between a first electrode exposed to the gas mixture and a second electrode exposed to a reference gas. The measuring sensor is heated to operating temperature. The Nernst measuring cell is exposed to a constant test voltage and a gas mixture with a well-defined oxygen concentration and a measuring current of the Nernst measuring cell is evaluated.
Claims3
A method for testing a measuring sensor to determine an oxygen concentration in a gas mixture, the measuring sensor supplying a detection voltage furnished by a Nernst measuring cell and corresponding to the oxygen concentration, the Nernst measuring cell including a first electrode and a second electrode, the method comprising the steps of:
- heating the measuring sensor to an operating temperature;
- exposing the Nernst measurement cell to a constant test voltage and to a gas mixture having a well-defined oxygen concentration;
- evaluating a measuring current of the Nernst measuring cell;
- picking off the detection voltage between the first electrode exposed to the gas mixture and the second electrode exposed to a reference gas;
- and
- evaluating the detection voltage using a circuit arrangement.
Dependencies are inferred from the claim text.