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44 Micro Motion 7827 Digital Viscosity Meter
Calibration Check
For unstable or high-pressure vapor liquids
A pressure pyknometer can be used. The pressure pyknometer and its associated pipework can be
coupled to the pipeline so that a sample of the product flows through it. When equilibrium is reached,
the meter density reading is noted as the pyknometer is isolated from the sample flow. The
pyknometer is removed for weighing to establish the product density. This density result is now
compared with the reading from the meter.
For further details on these procedures, reference should be made to:
Energy Institute: HM7. Density, sediment and water. Section 1: General
guidance on test methods (formerly PMM Part VII, S1)
1st ed 1996 ISBN 978-0-85293-154-7
Energy Institute: HM8. Density, sediment and water. Section 2: Continuous
density measurement (formerly PMM Part VII, S2)
2nd ed Sept 1997 ISBN 978-0-85293-175-2
American Petroleum Institute: Manual of Petroleum Measurement Standards
Chapter 14 - Natural Gas Fluids - Section 6: Installing and
proving density meters used to measure hydrocarbon liquid
with densities between 0.3 and 0.7 g/cc at 15.56°C (60°F)
and saturation vapour pressure, April 1991.
The procedure for calculating the new calibration coefficients K0' and K2' from the data derived
above is illustrated in Figure 6-1.
6.3.3 Requirements for VOS correction
This correction only needs to be applied if one or more of the following conditions exist concerning
the calibration fluid used and the eventual product fluid being measured:
• The VOS of the calibration fluid is appreciably different to that of the measured fluid.
• The VOS and density of the calibration fluid are significantly displaced from the optimized
profile (see the Calculated Parameters appendix).
• The VOS of the product fluid changes significantly with temperature.