Method for determining the state of an electrochemical gas sensor

US5733436A · kind A · utility

Assignee

• Testo AG · DE

Inventors

• Ullrich Demisch · Glückstadt, DE
• Joerg Pahlke · Titisee, DE
• Peter Ziegler · Mainz, DE

Key dates

• Filing date: Mar 19, 1996
• Grant date: Mar 31, 1998
• Expiry date: Mar 19, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N27/4163
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

This invention relates to a process for determining the state of an electrochemical gas sensor located in an environment with a known and constant concentration of a gas which is to be detected, where said gas to be detected is converted by chemical reaction at a three-phase boundary formed by a measuring electrode, an electrolyte and the gas to be detected, and where a current flowing in an external circuit functions as a sensor signal, whereby for determination of the state of the gas sensor, the external circuit is temporarily interrupted, and during this time the gas sensor is in specific exposure with the gas to be detected, and the resulting transient of the sensor is recorded and evaluated over time after the external circuit is closed.