Gas sensing and measuring device and process using catalytic graphite sensing electrode
US4265714A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1980 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Mar 24, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4045
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A gas detecting and measuring device and method highly selective for the detection of certain gases is described. The gas detector is capable of detecting and measuring a gas which can be electrochemically oxidized or electrochemically reduced at a voltage of between about 0.6 and 1.5 volts relative to a standard hydrogen electrode. The gas detecting and measuring device and process are highly selective for the oxides of nitrogen (NO.sub.x) and chlorine. The gas detecting device utilizes a hydrated, solid polymer electrolyte ion transporting membrane in electrical contact with an improved catalytic graphite sensing electrode. For detecting an oxidizable gas such as nitric oxide (NO), an improved graphite anode in contact with the solid polymer electrolyte is used with a cathode and a reference electrode as an electrochemical cell, and for detecting a reducible gas such as chlorine (Cl.sub.2) or nitrogen dioxide (NO.sub.2), an improved graphite cathode is used with an anode and a reference electrode as an electrochemical cell. Under an applied voltage, oxidizable gas is oxidized at the graphite anode and is detected or measured by a suitable circuit as a result of the current genera…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.