Sampling arrangement for thermal gravimetric analyzer

Details Sampling arrangement for thermal gravimetric analyzer Sampling arrangement for thermal gravimetric analyzer

1994-04-05

1995-08-08

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

With sample supply means

250281, H01J 4900, B01D 5944

Patent

active

054401208

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.

REFERENCES:
patent: 5191211 (1993-03-01), Gorman
patent: 5204270 (1993-04-01), La Count
patent: 5256374 (1993-10-01), De Silva et al.

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