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Gas leaks supplied through metal capillaries are nowadays largely used in industry to calibrate “in situ” leak detectors (necessary in tightness tests, versus both vacuum and atmospheric pressure) or in whatever applications in which well-known (and very low) gas flows are necessary. If the capillaries are calibrated with a primary device or a reference one, the traceability of flow measurements to...
Primary standard gas flow meters are developed for various applications such as calibration of leak artefacts, generation of calibration pressures by dynamic gas expansion and calibration of secondary standard gas flow meters. The Istituto di Metrologia “G. Colonnetti” (IMGC), Italy, and the University of Applied Sciences Giessen-Friedberg (UASG), Germany, maintain primary flow meters based on different...
The IMGC-CNR constant pressure and variable volume gas flowmeter is described together with its automatic electronic control and data acquisition system. It is used to produce low pure-gas throughputs in the 10 -3 -10 -8 Pa m 3 s -1 range, at the reference temperature of 294.15 K. This flowmeter may be used for both the pressure generation in the continuous-expansion...
Several rotors were calibrated both at ETL and IMGC in the pressure range from 10 -4 to 100 Pa. The calibrations were performed in argon atmosphere by using a static multi-stage system at the ETL and dynamic and static apparatus at IMGC. With stable rotors, the comparison showed that the two laboratories agree within 1%. Two rotors were calibrated also at higher pressures, with the aim...
Results concerning the calibration of metal capillary tubes of the linear and crimped types with different inert testing gases from 3 10 -8 Pa m 3 s -1 to 3 10 -5 Pa m 3 s -1 (1 10 -11 mol s -1 -1 10 -8 mol s -1 ) are presented. A primary flowmeter connected to a...
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