API tables, process fluids, measurement units, and default reference values (continued)Table 4-4:
Process fluid API table Referred density (API)
Default reference
temperature
Default reference
pressure
53B Unit: kg/m
3
Range: 653 to 1075 kg/m³
15 °C 0 kPa (g)
Liquids with a constant den-
sity base or known thermal
expansion coefficient
6C Unit: °API 60 °F 0 psi (g)
24C Unit: SGU 60 °F 0 psi (g)
54C Unit: kg/m³ 15 °C 0 kPa (g)
Lubricating oils 5D Unit: °API
Range: −10 to +40 °API
60 °F 0 psi (g)
23D Unit: SGU
Range: 0.8520 to 1.1640
SGU
60 °F 0 psi (g)
53D Unit: kg/m³
Range: 825 to 1164 kg/m³
15 °C 0 kPa (g)
NGL (natural gas liquids) 23E Unit: SGU 60 °F 0 psi (g)
LPG (liquid petroleum gas) 24E Unit: SGU 60 °F 0 psi (g)
Restriction
These tables are not appropriate for the following process fluids: propane and propane mixes,
butane and butane mixes, butadiene and butadiene mixes, isopentane, LNG, ethylene, propylene,
cyclohexane, aeromatics, asphalts, and road tars.
Set up temperature and pressure data for API referral using
ProLink III
The API referral application uses temperature and pressure data in its calculations. You
must decide how to provide this data, then perform the required configuration and setup.
Tip
Fixed values for temperature or pressure are not recommended. Using a fixed temperature or
pressure value may produce inaccurate process data.
Important
Line temperature data is used in several different measurements and calculations. It is possible to
use the internal RTD temperature in some areas and an external temperature in others. The
transmitter stores the internal RTD temperature and the external temperature separately. However,
the transmitter stores only one alternate temperature value, which may be either an external
temperature or the configured fixed value. Accordingly, if you set up polling for temperature in one
area, and digital communications in another, and configure a fixed temperature value in a third, the
fixed value will be overwritten by polling and digital communications, and polling and digital
communications will overwrite each other.
Configure process measurement
Configuration and Use Manual 37
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