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EVS-EN ISO 20486:2018

Non-destructive testing - Leak testing - Calibration of reference leaks for gases (ISO 20486:2017)

General information
Valid from 15.02.2018
Base Documents
EN ISO 20486:2018; ISO 20486:2017
Directives or regulations
None

Standard history

Status
Date
Type
Name
15.02.2018
Main
01.06.2002
Main
ISO 20486:2017 specifies the calibration of those leaks that are used for the adjustment of leak detectors for the determination of leakage rate in everyday use. One type of calibration method is a comparison with a reference leak. In this way, the leaks used for routine use become traceable to a primary standard. In other calibration methods, the value of vapour pressure was measured directly or calculated over a known volume.
The comparison procedures are preferably applicable to helium leaks, because this test gas can be selectively measured by a mass spectrometer leak detector (MSLD) (the definition of MSLD is given in ISO 20484).
Calibration by comparison (see methods A, As, B and Bs below) with known reference leaks is easily possible for leaks with reservoir and leakage rates below 10−7 Pa·m3/s.
Figure 1 gives an overview of the different recommended calibration methods.
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