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b. Write the desired reference pressure to Registers 4601–4602, in the
measurement unit required by the selected API table. Use 32-bit IEEE floating-
point format.
API tables supported by the API referral application
The API tables listed here are supported by the API referral application.
API tables, process fluids, measurement units, and default reference valuesTable 4-7:
Process fluid API table Referred density (API)
Default reference
temperature
Default reference
pressure
Generalized crude and JP4 5A Unit: °API
Range: 0 to 100 °API
60 °F 0 psi (g)
23A Unit: SGU
Range: 0.6110 to 1.0760
SGU
60 °F 0 psi (g)
53A Unit: kg/m
3
Range: 610 to 1075 kg/m³
15 °C 0 kPa (g)
Generalized products (gaso-
line, jet fuel, aviation fuel,
kerosene, heating oils, fuel
oils, diesel, gas oil)
5B Unit: °API
Range: 0 to 85 °API
60 °F 0 psi (g)
23B Unit: SGU
Range: 0.6535 to 1.0760
SGU
60 °F 0 psi (g)
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.
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Fork Viscosity Meters (FVM)