Apparatus and method for producing a gas having a controlled water vapor content
US4385910A · kind A · utility
8Cited by
9References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 23, 1981 |
| Grant date | May 31, 1983 |
| Priority date | — |
| Expiry date | Dec 23, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N33/0006
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus (10) and method for producing a gas having a controlled water vapor content is disclosed. Present methods of adding varying amounts of water to a gas containing nitric oxide may undesirably alter the composition of the gas. The present invention solves the above problem by providing an apparatus (10) and method for substantially fully saturating an unconditioned gas, subsequently removing water from a preselected portion of the saturated gas, and then mixing the preselected dry and saturated portions of the gas. The present invention is particularly useful in calibrating exhaust emission analyzers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.