Measuring and testing – Particle size
Patent
1991-02-28
1992-07-28
Raevis, Robert
Measuring and testing
Particle size
G01N 1508
Patent
active
051332191
ABSTRACT:
An apparatus and method are disclosed for obtaining adsorption data to be used for surface area and pore volume analysis. The apparatus and method utilize the differential pressures between a pair of dosing systems to indicate the amount of gas adsorbed by a sample. The system doses a sample chamber and a null chamber from essentially equal volumes of gas, and causes the chambers to be dosed such that any pressure difference between them, caused by adsorption, is eliminated. The resulting differential pressure between the essentially equal volumes of gas then indicates the amount of gas adsorbed by the sample. The system may be operated to dose in equilibrated increments or in a scanning mode in which adsorbate gas is continuously leaked into the sample chamber. A feedback circuit then controls dosing into the null chamber to eliminate the pressure difference caused by adsorption onto the sample surface. A differential pressure transducer connecting the volumes from which the gas is released then indicates the amount of gas adsorbed.
REFERENCES:
patent: 2729969 (1956-01-01), Innes
patent: 2960870 (1959-11-01), Nelsen et al.
patent: 3059478 (1962-10-01), Coggeshall et al.
patent: 3262319 (1966-07-01), Orr, Jr. et al.
patent: 3349625 (1967-10-01), Benusa et al.
patent: 3464273 (1969-09-01), Hendrix et al.
patent: 3555912 (1971-01-01), Lowell
patent: 3707870 (1973-01-01), Herve et al.
patent: 3850040 (1974-11-01), Orr, Jr. et al.
patent: 4083228 (1978-04-01), Turner et al.
patent: 4489593 (1984-12-01), Pieters et al.
patent: 4496249 (1985-01-01), Lee et al.
patent: 4566326 (1986-01-01), Lowell
patent: 4718270 (1988-01-01), Storr
patent: 4762010 (1988-08-01), Borghard et al.
patent: 4854157 (1989-08-01), Wilson
"Particle Measurement" Brochure-Strohlein Laboratory and Measurement Technology.
"Strohlein AREA-Meter" brochure.
Bosch H. and Peppelenbos, A., "Automatic and Low Cost Determination of BET Surface Areas" J. of Physics E: Scientific Instruments 1977, pp. 605-608.
Micromeritics Instrument Corporation
Raevis Robert
LandOfFree
Dynamically balanced, differential gas adsorption appartaus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Dynamically balanced, differential gas adsorption appartaus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dynamically balanced, differential gas adsorption appartaus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1681195