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Configuration and Use Manual 55
Configuration
Startup ConfigurationCalibrationBefore You Begin Startup ConfigurationCalibrationBefore You Begin Startup ConfigurationCalibrationBefore You Begin Startup ConfigurationCalibrationBefore You Begin
4.6 Configuring the petroleum measurement application
The petroleum measurement parameters determine the values that will be used in petroleum
measurement-related calculations. The petroleum measurement parameters are available only if the
petroleum measurement application is enabled on your transmitter.
Note: The petroleum measurement application requires liquid volume measurement units. If you plan
to use petroleum measurement process variables, ensure that liquid volume flow measurement is
specified. See Section 4.4.
4.6.1 About the petroleum measurement application
Some applications that measure liquid volume flow or liquid density are particularly sensitive to
temperature factors, and must comply with American Petroleum Institute (API) standards for
measurement. The petroleum measurement application enables Correction of Temperature on volume
of Liquids, or CTL.
Terms and definitions
The following terms and definitions are relevant to the petroleum measurement application:
• API – American Petroleum Institute
• CTL – Correction of Temperature on volume of Liquids. The CTL value is used to calculate
the VCF value
• TEC – Thermal Expansion Coefficient
• VCF – Volume Correction Factor. The correction factor to be applied to volume process
variables. VCF can be calculated after CTL is derived
CTL derivation methods
There are two derivation methods for CTL:
• Method 1 is based on observed density and observed temperature.
• Method 2 is based on a user-supplied reference density (or thermal expansion coefficient, in
some cases) and observed temperature.