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76 Micro Motion
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Series 3000 MVD Transmitters and Controllers
Configuring the Petroleum Measurement Application
9.3 About petroleum measurement
The petroleum measurement application enables Correction of Temperature on volume of Liquids, or
CTL. In other words, 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 parameters determine the values that will be used in API-related
calculations. The petroleum measurement parameters are available only if the petroleum measurement
application is installed on your Series 3000 device.
9.3.1 Definitions
The following terms and definitions are used in this chapter:
• API – American Petroleum Institute
• CTL – Correction for 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
9.3.2 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.
The choice of reference table determines the derivation method to be used, as discussed in
Section 9.4.1.
9.4 Configuring petroleum measurement parameters
The petroleum measurement parameters are listed and defined in Table 9-1.
Table 9-1 Petroleum measurement parameters
Variable Description
Table type Select the table that matches your requirements. See Section 9.4.1.
User defined TEC
(1)
(1) Displayed only if Table Type is set to 6C, 24C, or 54C.
Thermal expansion coefficient. Enter value to be used in CTL calculation.
Temperature units
(2)
(2) In most cases, the temperature unit used by the API reference table should also be the temperature unit configured for the device to
use in general processing. To configure the temperature unit, see Section 7.3.
Read-only. Displays the unit used for reference temperature in the reference table.
Density units Read-only. Displays the unit used for reference density in the reference table.
Reference
temperature
Read-only unless Table type is set to 53x or 54x. If configurable:
• Specify the reference temperature to be used in CTL calculation.
• Enter reference temperature in °C.