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.
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.
Le présent document décrit l'étalonnage des fuites pour le réglage des détecteurs de fuites et la détermination du flux de fuites dans un usage quotidien. L'étalonnage par comparaison avec une fuite de référence connue peut être appliqué aux fuites de réservoir et aux fuites de débit inférieur à 10-7 Pa.m3/s. Pour les flux de fuite compris entre 10-7 Pa.m3/s à 10-4 Pa.m3/s, ils peuvent seulement être calibrés en mesurant leur débit dans un tube capillaire. Les flux de fuite supérieurs peuvent être mesurés avec des débitmètres.
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