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Title: Comparison Test Program Liquid Flow Measurement Final Results Cenam - Ptb - NIST
Author: Jose Lara, Dario A. Loza, Heinz Luchsinger
Source: 2002 International Symposium on Fluid Flow Measurement
Year Published: 2002
Abstract: This comparison-test program (1997/1998) CENAM - PTB - NIST was in order to assess the Mexican primary standard for liquid flow measurement. This program was initiated by CENAM to establish and maintain satisfactory liquid flow measurement in Mexico. In the future this program could be expanded to the international flow measurement community to include other Latin America laboratories. The estimated uncertainty for CENAMs volumetric flow rate facility is nearly constant over the range of 300 L/min to 2 100 L/min ( 0,12 % with a coverage factor k2). We expected that the results differences among NIST, PTB and CENAM were inside CENAMs uncertainty limits, however the test results from the first phase of the comparison denoted that K factor differences were bigger than the ones we expected. The three national laboratories use the gravimetric technique. The test results of this comparison program are presented graphically.

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