Liquid sample evaporator for vapor analysis
US8181544B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 18, 2008 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Oct 9, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2001/2893
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Preparation methods for introducing liquid samples to gas analysis instruments include 1) complete evaporation of a liquid sample in a sample chamber, and 2) allowing the sample vapor in the sample chamber to equilibrate for a predetermined time. An inert carrier gas (e.g., dry nitrogen or zero air) is also admitted to the sample chamber. After equilibration, the sample vapor is admitted as a conditioned sample to an analysis instrument. Preferably, the predetermined equilibration time is sufficiently long that the sample vapor in the sample chamber becomes substantially homogeneous with respect to both concentration and isotopic ratio. Vapor derived from a liquid calibration standard in this manner can be employed as an accurate gas-phase calibration reference.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.