Sampling arrangement for thermal gravimetric analyzer
US5440120A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 1994 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Apr 5, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N1/22
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A thermal gravimetric analyzer includes a reaction tube disposed within a heating element and including a sample container disposed therein. A reaction gas is introduced at a first end of the reaction tube and allowed to react with the sample, while a purge gas is introduced at a second, opposed end of the reaction tube to isolate a beam system, from which the sample and sample container are suspended, from the reaction gas. A Fourier transform infrared (FTIR) spectrometer as well as a mass spectrometer coupled to the reaction tube may be used to analyze the off-gas products of the reaction of the sample with the reaction gas. Sniffer tubes are used to provide off-gas samples to the two spectrometers, with each sniffer tube having a first inlet end disposed immediately adjacent the sample container and a second outlet end coupled to a sample inlet port of a respective spectrometer. The sniffer tubes increase off-gas product measurement sensitivity by reducing the total volume of gas analyzed and increasing the concentration of the off-gas products within the volume of the gas being analyzed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.