Final Report on the Key Comparison CCM.P-K4.2012 in Absolute Pressure from 1 Pa to 10 kPa

Area of Science:

• Metrology
• Pressure Measurement
• Physical Sciences

Background:

• The Consultative Committee for Mass (CCM) conducts key comparisons to ensure global metrology consistency.
• Accurate absolute pressure measurement is critical across various scientific and industrial applications.
• Previous comparisons established baseline performance for national metrology institutes (NMIs).

Purpose of the Study:

• To summarize the results of the CCM.P-K4.2012 key comparison for absolute pressure.
• To assess the measurement capabilities of six participating NMIs within the 1 Pa to 10,000 Pa range.
• To ensure the equivalence of pressure standards maintained by NMIs.

Main Methods:

• A calibrated transfer standard was used as a stable artifact for comparison.
• The transfer standard was measured at each participating NMI's facility using their laboratory standard.
• Measurements were conducted between May 2012 and September 2013.

Main Results:

• The transfer package performed as designed, providing a stable artifact.
• All six participating NMIs demonstrated statistically equivalent results.
• Participants' measurements were found to be in agreement with the key comparison reference value.

Conclusions:

• The participating NMIs demonstrated high equivalence in their absolute pressure measurement capabilities.
• The results of CCM.P-K4.2012 support the reliability of international pressure standards.
• The comparison validates the metrological capabilities of the involved national metrology institutes.