Gas sensor and gas sensor system
US6370941B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2001 |
| Grant date | Apr 16, 2002 |
| Priority date | — |
| Expiry date | Feb 5, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/4925
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The conduit tube 3 and the conduit tube 4 to flow the carrier solution to the gas exchanger 7 are provided, and in the conduit tube 3, the reference pH electrode 14 is provided, and in the conduit tube 4, the measuring pH electrode 16 is provided, both pH electrodes preferably being chosen of the ISFET type (Ion-Sensitive Field-Effect-Transistor). The gas exchanger 7 is partitioned from the outside by the gas permeable membrane 6. Initially, the gas exchange section 1 is inserted into the test substance, and next, the carrier solution is flowed at the speed of a degree in which the gas exchange is not conducted in the gas exchanger 7. The output potential difference &Dgr;V(0) between the reference pH electrode 14 and the measuring pH electrode 16 at this time, is found. Next, the carrier solution is slowly flowed at a predetermined speed, so that the gas exchange is fully conducted in the gas exchanger 7, the output potential difference &Dgr;V(t) between the reference pH electrode 14 and the measuring pH electrode 16 at time t is found, and the difference &Dgr;&Dgr;V(t) between the &Dgr;V(t) measured at this time and the &Dgr;V(0)obtained at the last time, is obtained. This value c…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.