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EVS-EN ISO 20486:2018

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

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Kehtiv alates 15.02.2018
Alusdokumendid
EN ISO 20486:2018; ISO 20486:2017
Tegevusala (ICS grupid)
19.100 Mittepurustav katsetamine
Direktiivid või määrused
puuduvad

Standardi ajalugu

Staatus
Kuupäev
Tüüp
Nimetus
15.02.2018
Põhitekst
01.06.2002
Põhitekst
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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