32 Operation
7.4 Diffusion Test When pressure is applied to the upstream side of a wet filter, a diffuse gas stream
starts to flow through the filter membrane after a short time. Diffusion is dependent
on the effective filter surface area. The diffusion test is not suitable for testing disk
filter systems. However, the diffusion test is a very well suited test method for the
integrity testing of medium-sized and larger filter cartridge systems starting from
approx. 150 cm
2
. The diffusion value refers to a test pressure, which means there is
a direct correlation to the actual retention behavior of the filter (for a more detailed
description, see Chapter 12, Appendix).
In the menu “Programming tests: Program selection”, the test type is selected.
– Select test type (standard test or user-defined test)
In the menu “Test parameters: External connections,” decisions about external
connections and the configuration are entered. The function keys are used here to
enter the appropriate settings. The following external connections and parameters
must be configured for all tests:
– Standard test (Yes|No)
– External pressure sensor (Yes|No)
– External valves (Yes | No)
The parameters for the standard test are defined in the configured Service Menu.
Unlike the defaults (standard values), the values can be individually adjusted.
For the diffusion test, you have the following options:
Pressure unit: mbar|psi|hPa
Automatic test mode: No|Yes
Enter parameters for the diffusion test
Test pressure: from 100 – 8000 mbar
Stabilization time: in min.
Test time: in min.
Max. diff.: in ml/min
Net volume: in ml
In the menu “Test parameters: Diffusion test,“ the parameters for the diffusion test
are entered with or without net volume measurement.
For tests with volume measurements:
– Test pressure
– Stabilization time
– Test time
– Max. diffusion
When conducting tests without volume measurement, net volume should
be entered separately.
The test parameter data can be found in the validation documents of the respective
filter cartridge.
Locks
The locks are activated for the test parameters (default). After entering with the
Shift + F keys, the programmer can lock the data to prevent any changes.
The dialog boxes are then highlighted in gray. The user can no longer change
the entered data.
Fig. 7-7 | Programming tests: Program selection
Fig. 7-8 | Test parameters: External connections
Fig. 7-9 | Test parameters: Diffusion test
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