Patent ID: 6582663
Filing Date: 2003-06-24
Classification: G01N

Abstract:
An apparatus for the titration of a gas, of the type comprising:a main duct connected by a first valve to a source of gas under pressure, said main duct being also connected to a first pressure sensor; a first derivation duct connecting the main duct via a second valve to a sample carrying tube which is located in a furnace of adjustable temperature and is devised to receive a sample of a substance having gas absorption or adsorption/desorption properties to be measured; a second derivation duct having first and second ends connected to the main duct, said second derivation duct connecting in series a third valve, a first tank and a differential pressure sensor; a third derivation duct connecting a pump via a fourth valve to the main duct; an isothermal enclosure for keeping the ducts and valves at a stable and controlled temperature; and a control system for adjusting and controlling at will the temperature of the furnace, the pressure of the gas and the valves in real time; said apparatus being characterized in that it further comprises: a fourth derivation duct connected via a fifth valve to a reference tube which has the same characteristics as the sample carrying tube and is located together with the same in the furnace, said fourth derivation duct being connected to the second duct between the first tank thereof and the differential pressure sensor; and a buffer tank mounted onto the main duct between the first and second ends of the second derivation duct, said buffer tank being filled up with metal chunks to reduce its dead volume, and used for compensating any difference in volume in the main and derivation ducts.