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Fukuda FL-601 Series Operational Manual page 115

Multipurose air leak tester

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SUPPLEMENT MASTERLESS Q&A
Q4: Is it necessary to use a work that does not have a leak for fitting testing?
A4: Any good, inline work can be used.
With the Masterless leak tester, the differential pressure generated from non-leak sources is stored as "Master
Data." By subtracting the differential pressure from the "Master Data" during testing, we can obtain accurate
test results that only consider the leak (For more information and details please refer to principles on pages
20~21.) Tests that include reading the "Master Data" are called fitting tests. At this point it becomes necessary
to measure the differential pressure generated from non-leak sources, therefore it would be ideal to have a work
that does not leak. Unfortunately, maintaining a leakless master is very difficult.
Please perform the following procedure to obtain the "Master Data" from a work in your production line.
Differential pressure generated from non-leak sources results in noise. Changes in work shape or
seal shape from the compressed air will result in a in volume change, and so will the temperature
change due to the air compressed and insulation. However, all of these conditions will converge and
stabilize over time. Therefore, if you allocate a sufficient amount of time, it is possible to conduct a
test without this noise interference, measuring differential pressure changes resulting only from
leaks.
The pressure drop that we must measure is insignificant compared to the test pressure. For this
reason, the change can be considered to be proportional to time. The change in differential pressure
(following stabilization) resulting from a leak only is seen as being proportional to these constituents.
Once the differential pressure is subtracted from the differential data obtained during the detection
phase, we can obtain leakless data or "Master Data".
However, if the leak rate is significantly large, the other error constituents will increase as well.
Therefore, it would be advantageous to use data from a known good work (a small leak may be
acceptable.)
114
Stable domain
Fitting Detection Process

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