METHOD AND APPARATUS FOR DYNAMIC MEASUREMENT OF MASSIC AREAS (SPECIFIC SURFACES) AND ISOTHERMAL DETERMINATION BY ADSORPTION AND DESORPTION OF A GAS MIXTURE OF CONSTANT COMPOSITION

摘要

ACCORDING TO THIS METHOD, OF THE DYNAMIC BET TYPE, THE SAMPLE PRESSURE MAY VARY BETWEEN A SUBATMOSPHERIC LOWER VALUE AND SUBATMOSPHERIC SUPERIOR VALUES OR NOT. /P P THE ASSOCIATED APPARATUS DOWNSTREAM : A SOURCE 1 OF A GAS MIXTURE OF ADSORBAT AND NON-ADSORBABLE GAS; A REGULATOR 2; IN PARALLEL: A REFERENCE CIRCUIT 4 AND A MEASUREMENT CIRCUIT 3 INCLUDING A SAMPLE HOLDING CELL 6, THESE TWO CIRCUITS 3, 4 THROUGH A CATHAROMETER 12; THE TWO CIRCUITS 3, 4 DELIVER ON A VACUUM PUMP 23. /P P A FLOW REGULATOR 7 IS PLACED UPSTREAM OF THE SAMPLE HOLDER CELL 6 AND A LOAD ADJUSTMENT VALVE 8 IS INTERPOSED BETWEEN THE SAMPLE HOLDER CELL 6 AND THE CATHAROMETER 12.