Solartron Mobrey 7828, Technical Manual

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7828 Density Transmitter Technical Manual Calibration check
78285000_AA
5-5
4. Measure the density of the sample under defined laboratory conditions using a
hydrometer or other suitable equipment. Refer this to the operating conditions at the
transducer.
5. Calculate the density offset required to make the 7828 measurement the same as the
measured density of the sample.
6. Using ADView’s Register Read/Write tool (see section 4.4.7), configure the 7828 with
the calculated line density offset (Register 173).
Calibration adjustment - unstable or high vapour pressure liquids:
A pressure pyknometer and its associated pipework can be coupled to the pipeline so that
a sample of the product flows through it.
1. Using ADView (see chapter 4), reset the line density offset (register 173) to 0, and the
line density scaling factor (register 174) to 1.
2. Ensure that the system has reached its stable operating temperature.
3. When equilibrium conditions of product flow are reached, note the 7828 density
reading and temperature and simultaneously isolate the pyknometer from the sample
flow.
4. Remove the pyknometer for weighing to establish the product density.
5. Compare the pyknometer reading with the 7828 reading and compute the density
offset required.
6. Using ADView’s Register Read/Write tool (see section 4.4.7), configure the 7828 with
the calculated line density offset (Register 173).
For further details on these procedures, reference should be made to:
Institute of Petroleum: Petroleum Measurement Manual
Part VII Section 1 - Method IP 160
Institute of Petroleum: Petroleum Measurement Manual
Part VII Section 2 - Continuous
Density Measurement
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
0.7gm/cc at 15.56°C (60°F) and saturation vapour
pressure, Sept 1979.