Method for sensing nitrous oxide
US5034107A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 12, 1989 |
| Grant date | Jul 23, 1991 |
| Priority date | — |
| Expiry date | Dec 12, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4074
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A method for identifying and determining the concentration of nitrous oxide in a gas containing nitrous oxide, oxygen and nitrogen is disclosed. A negative voltage is applied across a set of electrodes separated by an electrolyte wall. The voltage is of such a magnitude to produce an electric current which is on a plateau. The current is measured initially using air or oxygen as a test gas. After this reading is taken the gas containing nitrous oxide in oxygen and air is measured for its current and the concentration of nitrous oxide is determined using the two measured currents. The negative voltage can be applied at two different magnitudes to have two currents measured. Nitrous oxide containing mixtures would yield equivalent current readings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.