During last winter, a bilateral comparison of gas flow rate measurements was carried out between two laboratories: INRIM, Italy and LMPS, Slovenia. Two mass flow controllers (MFCs) were chosen to be used as transfer standards. Although thermal mass flow sensors are not foreseen as superior transfer standards for gas flow rate [1], we tried to find if they can assure proper stability and robustness when the measurement conditions (pressure, temperature etc.) are set under relatively tight control. One of the reasons for their choice was also having a large number of such instruments on our disposal, which allowed selecting a couple of instruments that permitted an easy comparison through the requested range of flow rates. The results of the comparison were found to be interesting, as they produced some unexpected outcome, and were therefore deemed worthy of publication. The elaboration technique employed a study of the stability of the instruments in the short and medium term that are crucial for validation of measurement capabilities of participating laboratories.
Comparison of MFCs between INRIM and LMPS in the range (10 to 20000) scm3/min / Spazzini, PIER GIORGIO; Piccato, Aline; Kutin, J; Bobovnik, G; Bajsi, I.. - (2012). (Intervento presentato al convegno 8th International Symposium on Fluid Flow Measurement (ISFFM 2012) tenutosi a Colorado Springs, Co, USA nel Giugno 2012).
Comparison of MFCs between INRIM and LMPS in the range (10 to 20000) scm3/min
SPAZZINI, PIER GIORGIO;PICCATO, ALINE;
2012
Abstract
During last winter, a bilateral comparison of gas flow rate measurements was carried out between two laboratories: INRIM, Italy and LMPS, Slovenia. Two mass flow controllers (MFCs) were chosen to be used as transfer standards. Although thermal mass flow sensors are not foreseen as superior transfer standards for gas flow rate [1], we tried to find if they can assure proper stability and robustness when the measurement conditions (pressure, temperature etc.) are set under relatively tight control. One of the reasons for their choice was also having a large number of such instruments on our disposal, which allowed selecting a couple of instruments that permitted an easy comparison through the requested range of flow rates. The results of the comparison were found to be interesting, as they produced some unexpected outcome, and were therefore deemed worthy of publication. The elaboration technique employed a study of the stability of the instruments in the short and medium term that are crucial for validation of measurement capabilities of participating laboratories.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
