US 6,270,639 B1Granted

Electrochemical sensor

AssigneeRobert Bosch GmbH

InventorsMartin Lenfers, Olaf Jach, Harald Neumann, Walter Strassner, Johann Riegel, Lothar Diehl

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Abstract

An electrochemical sensor determining a gas concentration of the measuring gas. The sensor has an electrochemical element including a first solid electrolyte body having an electrochemical pump cell and a first (external pump) and a second (internal pump) electrode and having a gas chamber which is connected to the measuring gas chamber via a gas supply opening and in which the second electrode is arranged. The electrochemical element also includes a second solid electrolyte body having an electrochemical sensor cell (e.g., a Nernst cell) and a third and fourth electrode, each electrode having a lead for the electrical contacting. The leads of the first and second electrodes are decoupled capacitively from the lead of at least the fourth electrode by a device.

Claims6

Dependent claims

An electrochemical sensor for determining a gas concentration of a measuring gas, said sensor having a layered design, comprising:

an electrochemical pump cell having a first electrolyte body, a first electrode and a second electrode, the first electrode being disposed on the first electrolyte body, the first electrolyte body including a pump gas chamber which is connected via a gas supply opening to a measuring gas chamber, the second electrode being disposed in the pump gas chamber;
and
an electrochemical sensor cell having a second electrolyte body, a third electrode and a fourth electrode, the third electrode being disposed in the pump gas chamber;
wherein a first lead electrically contacts the first electrode, a second lead electrically contacts the second and the third electrodes, and the fourth electrode has a third lead for an electrical contact, wherein the second lead lies in a plane of stratification between the first lead and the third lead, and wherein the first lead is capacitively decoupled from the third lead by an electron-conducting layer, the electron-conducting layer being disposed in a plane of stratification between the first lead and the third lead, and wherein the width of the electron-conducting layer substantially corresponds to the width of the electrochemical sensor.

1 more element

Dependencies are inferred from the claim text.