Method for the calibration of an oxygen sensing unit and calibration agent therefor

US4336031A · kind A · utility

Assignee

• Hellige GmbH · DE

Inventors

• Joachim Hopmeier · Freiburg im Breisgau, DE
• Helmut Leist · Freiburg im Breisgau, DE
• Georg J. Ullrich · Freiburg im Breisgau, DE

Key dates

• Filing date: Nov 17, 1980
• Grant date: Jun 22, 1982
• Expiry date: Nov 17, 2000

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T436/207497
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Disclosed herein is a method for the calibration of a sensing unit for determining the partial pressure of oxygen in contact with the sensing unit. The method is of the type using a zero-calibration solution in which the partial pressure of oxygen is maintained at zero by virtue of a binding agent present in the solution for chemically combining with the oxygen. The essential steps of the method include adding to the solution a color indicator for indicating that the zero-calibration solution contains unspent binding agent, contacting the sensing unit with the zero-calibration solution containing the unspent binding agent and the color indicator, energizing the sensing unit, and adjusting the sensing unit until it indicates zero concentration. The invention also compasses within its scope a calibration agent for use in the performance of the method for supplying the zero-calibration solution upon dissolution in water, as well as a container for storing the zero-calibration solution.