Bubble Point Test - Sartorius Sartocheck 4 plus Operating Instructions Manual

Fig. 7-17 | Volume Measurement
Fig. 7-18 | Test Phase

7.5 Bubble Point Test

Fig. 7-19 | Test parameters: Bubble Point Test
Volume Measurement
The volume is displayed in ml.
In the test phase, the current diffusion value is displayed as a graph and additionally
as a numerical value. The graph is designed so that the limit is drawn as a red line.
If the actual value is below this, the integrity of the filter is proven.
In wet membranes, the wetting liquid is held inside the porous structure by capillary
force. This force increases as the pore size decreases. A specific gas pressure
dependent on the pore size of the membrane is necessary to force out the liquid
from the pores. This pressure is generally designated as the "Bubble Point," or
B.P. for short. It generally indicates the largest pores of a filter since liquid is first
expelled from them. Hence, it follows that the B.P. of a filter depends both on the
filter material (the contact angle varies from material to material) and, in particular,
on the surface tension of the wetting fluid. Low surface tensions, as are present
in organic solvents, detergents and emulsifiers yield low B.P.'s.
Since the surface tension also depends on the temperature, different wetting
fluid temperatures will also yield different B.P.'s. The Bubble Point Test is especially
suitable for checking the integrity of disc filter systems.
(For a more detailed description, see Chapter 12, Appendix).
Test parameters: Bubble Point Test
Enter the parameters: BP Min. in mbar
BP Max. in mbar
System test class: e.g. standard
Net volume: Enter or measure, if Enter: Volume in ml
Recommendation for test-class selection:
Small Systems: disc filters, mini cartridges, capsules up to 5"
Standard Systems: 10''–20'' filter cartridges and capsules
Special Systems: 30" and small multiple cartridge systems
For bigger systems please use the customer specific BP Test.
Please contact Sartorius Stedim Biotech if specific settings are needed.
Operation 35