In situ heated oxygen probe with intrinsically safe output
US9518968B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 12, 2014 |
| Grant date | Dec 13, 2016 |
| Priority date | — |
| Expiry date | Jun 13, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/4067
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An in situ oxygen analyzer having an intrinsically-safe output and a heated probe is provided. The probe is extendable into a source of process gas and has an oxygen sensor and heater disposed therein. The heater is configured to heat the oxygen sensor to a temperature sufficient to operate the oxygen sensor. A housing is coupled to the probe and has first and second chambers. The first chamber is explosion-rated and includes non-intrinsically safe circuitry coupled to the heater to energize the heater. The second chamber contains only intrinsically-safe circuitry that complies with an intrinsically-safe specification. The first and second chambers are isolated from one another. The non-intrinsically-safe circuitry is coupled to the intrinsically-safe circuitry through an energy-limiting isolator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.