초록 ▼

A gas comparison pycnometer is disclosed which provides a method and apparatus for determining and checking the accuracy of the volume of a solid substance. The pycnometer is also outfitted with a unique cap assembly which fixes the volume in the pycnometer\s sample chamber from run to run. The pycn

A gas comparison pycnometer is disclosed which provides a method and apparatus for determining and checking the accuracy of the volume of a solid substance. The pycnometer is also outfitted with a unique cap assembly which fixes the volume in the pycnometer\s sample chamber from run to run. The pycnometer also employs a series of purges with a suitable gas to carry unwanted moisture and vapors out of the system. This pycnometer solves many problems in the prior art by quickly and accurately determining the volume of a solid substance.

대표청구항 ▼

An apparatus for determining the volume of a solid substance comprising: a sample chamber containing said substance; an integral expansion chamber connected by a passageway to said sample chamber; gas supply means for introducing a gas under pressure into one of said chambers; valve means for contro

An apparatus for determining the volume of a solid substance comprising: a sample chamber containing said substance; an integral expansion chamber connected by a passageway to said sample chamber; gas supply means for introducing a gas under pressure into one of said chambers; valve means for controlling flow of gas through said passageway; vent means for venting either of said chambers to atmosphere; means for measuring the pressure of gas within said one of said chambers; and control means for: (a) operating said gas supply means to pressurize with a gas the one of said chambers containing said pressure measuring means; (b) operating said pressure measuring means to measure the pressure in said one chamber; (c) operating said valve means to allow expansion of said gas through said passageway into said other chamber; (d) operating said pressure measuring means to measure the pressure in said connected chambers; (e) calculating a first volume of said sample; (f) storing said first volume; (g) operating said vent means to vent said chambers to atmosphere; (h) repeating (a) through (d); (i) calculating an additional volume of said sample; (j) comparing two or more of said volumes; (k) responsive to said compared volumes being within a predetermined tolerance, accepting one of said compared volumes as the volume of said sample; and (l) responsive to said compared volumes being outside said predetermined tolerance, repeating steps (h)-(j) until said compared volumes are within said predetermined tolerance.