EXPERIENCE IN THE USE OF A STRAIN-GAUGE PRESSURE TRANSDUCER FOR COMPARISON IN LIQUID-MEDIA UP TO 600 MPA BETWEEN THE NIST AND THE IMGC

Primary standard piston gauges are frequently used to perform pressure comparisons, but at other times, and particularly in the pressure ran ge greater than 300 MPa, suitable transfer standards are used for the same purpose. The IMGC and the NIST have completed a bilateral interco mparison for gauge pressure measurements in liquid media up to 600 MPa using a strain-gauge pressure transducer as the transfer standard. Th e main metrological characteristics of the transducer are discussed, p articularly the stability with time and the uncertainty limits for use as a transfer standard. The pressure scale between 100 MPa and 600 MP a as maintained by the two laboratories is described, and the results of the comparison are discussed in order to demonstrate the agreement in pressure measurement between the IMGC and the NIST.