The improved Density Reference System, the reference densimeter, and the method of determining sample density are described. The uncertainty of the density reference system is ± 0.055%. The contribution from the estimated systematic error in density was ± 0.022%. The estimated uncertainty caused by random error is three times the standard deviation of 0.011% and is based on sixty-three measurements of the densities of saturated liquid methane. The total density uncertainty is taken to be the sum of the systematic 3 and random errors. This applies to the density range of 400 to 480 kg/m at pressures from 0.8 to 4 bar absolute and temperatures between 109 and 128 K. This 3 accuracy statement is expected to apply over ranges of at least 400 to 1000 kg/m in density, 77 to 300 K in temperature, and 0.8 to 7 bar in pressure though the accuracy over these ranges has not been verified. * Compared to the original, this improved density reference system has greater accuracy, speed, reliability, and flexibility.
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