INFICON Helium Leak Detector Modul1000 - Manual (Page 53)

Operation
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6.10 Machine factor
The machine factor takes into account that the Modul1000 is used in parallel with a
pumping system.(partial flow method).
Because in such a system configuration only a part of the leak gas flow reaches the
leak test device and is detected, first. the Modul1000 displays measured values on
the basis of the internal calibration which are smaller due to the partial flow ratio.
To avoid this, the machine factor can be saved in the software menu of the
Modul1000. Then, after an internal calibration, the measured leak rates are displayed
multiplied by the machine factor.
The machine factor can be estimated considering the Helium pumping speed of the
Modul1000 and of the external pump.
The measurement of an external test leak on a test sample is more accurate when it
is measured with and without an added external pump. The ratio of both results is the
machine factor.
The machine factor can also be used to correct the leak rate display referred to the
air equivalent.
The machine factor for this correction is: 3.7 x 10
-1
.
When this setting is used, this status will be displayed by „COR“.