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Indirect measurement
The indirect measurement (also called recovery mode or under bell) allows a considerable
gain in time as the flow which enters into the device is already stabilized.
The test pressure is first applied to the input of the part under test1 and then to the
device2. The output of the device2 is vented to the atmosphere.
This method allows to test the parts at a higher pressure test (up to 2 MPa).
1 Part under test
2 Device
Depending on the part type, it may be possible to use a bell (ex: shower head where it is
impossible to recover the flow other than through the use of a bell). This method can only be
used if the recovery of the flow is easy.
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