Electrochemical determination of oxygen concentration
US5376244A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 29, 1992 |
| Grant date | Dec 27, 1994 |
| Priority date | — |
| Expiry date | Oct 29, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/4925
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a process for electrochemically determining the oxygen concentration, in particular in body fluids, by means of an oxygen sensor having a sensor electrode, an exact oxygen determination is possible if a potential profile having a plurality of potential stages is impressed on the sensor electrode, the first potential stage being in the range between -0.5 and -1.2 V (1st measuring potential), the second potential stage being in the range between -0.5 and -1.3 V 2nd measuring potential) and the third potential stage being about 0 V, referred in all cases to an Ag/AgCl reference electrode, and there being between the two measuring potentials a potential difference of .gtoreq.50 mV, the length of stay at the two measurement potentials is in each case between 10 and 50 ms (measurement period), the current flowing at the two measuring potentials is determined and is integrated with respect to time, the integration starting in each case about 5 to 30 ms after the start of the measurement period and lasting in each case between 5 and 10 ms, and the oxygen concentration is determined by taking the difference between the two integrals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.