US 9,810,564 B2
Method of determining an internal volume of a filter or bag device, computer program product and a testing apparatus for performing the method
Magnus Andreas Stering, Le mesnil le roi (FR)
Assigned to SARTORIUS STEDIM BIOTECH GMBH, Goettingen (DE)
Filed by Sartorius Stedim Biotech GmbH, Goettingen (DE)
Filed on Mar. 11, 2015, as Appl. No. 14/644,331.
Claims priority of application No. 14290111 (EP), filed on Apr. 16, 2014.
Prior Publication US 2015/0300863 A1, Oct. 22, 2015
Int. Cl. G01F 17/00 (2006.01); G01N 7/00 (2006.01)
CPC G01F 17/00 (2013.01) [G01N 7/00 (2013.01)] 15 Claims
OG exemplary drawing
 
11. A testing apparatus for determining an internal volume (V) of a filter or bag device (10), the testing device comprising:
a test gas inlet (52) connectable to a test gas supply (30),
a test gas outlet (51) in gas communication with the test gas inlet (52) for supplying the test gas to the internal volume (V) of the filter or bag device (10),
a flow meter (57) in communication with the test gas inlet (52) and the test gas outlet (51) for determining a mass flow (m) of the test gas,
at least one pressure sensor (22, 24) for determining a first pressure (p1) and a proof pressure (p0) that is higher than the first pressure (p1), and
a control device for determining the internal volume (V) of a filter or bag device (10) to be tested on the basis of at least the first pressure, the proof pressure and the mass flow or volumetric flow of test gas based on the equation for ideal gases, such that:
V=m×R×T/(pp−p1)
wherein R is the gas constant and T is the gas temperature.