Pressure Drop Test; Multipoint Diffusion Test - Sartorius Sartocheck 4 plus Operating Instructions Manual

7.9 Pressure Drop Test

Fig. 7-23 | Test parameters: Pressure Drop Test

7.10 Multipoint Diffusion Test

Fig. 7-24 | Test parameters: Multipoint Diffusion Test
38 Operation
The Pressure Drop Test is based on the change in pressure within a filter system
connected upstream. This change is caused by the diffusive gas stream flowing
through a wet membrane at a given test pressure (see "Diffusion Test").
The pressure drop measured in the process can be used as a direct measure of the
filter system's integrity, provided that the upstream volume of the system is constant
and known. For this reason, a Pressure Drop Test is recommended mainly to leak-test
empty housings and pressure vessels with a known volume.
We additionally recommend that you carry out the following Pressure Drop Test to
check for major leakages. (For a more detailed description, see Chapter 12, Appendix).
Pressure Drop Test
Test pressure: 3000 mbar
Stabilization time: 3 min
Test time: 3 min
Pressure drop: max. 3 mbar
Test parameters: Pressure Drop
Test pressure: in mbar
Stabilization time: in min.
Test time: in min.
Max. pressure drop: in mbar
The Multipoint Diffusion Test is based on the dependence of the diffusive gas
flow to the actual test pressure. Starting at a given minimum pressure, the test
pressure is increased step by step up to the maximum value, or the bubble point,
and the diffusion is measured for each pressure increment. All values are output
®
by Sartocheck 4 plus in the form of a pressure|diffusion curve and a data table.
The slope of the curve allows changes in the filter material to be identified before
the next filtration run so that by comparing the curves obtained at the beginning of
the filter's use, any defects can be detected before they can spoil an actual filtration
run. The Multipoint Diffusion Test is thus suitable as an additional test method for
verifying integrity test results.
Test parameters: Multipoint Diffusion Test
Min. test press.: in mbar
Max. test press.: in mbar
Pressure incr.: e.g. in 100 mbar increments
Test class: e.g. Standard
Net volume: Enter or measure, if Enter: Volume in ml