
70
Micro Motion Series 1000 and Series 2000 Transmitters
Optional Configuration
8.6
Configuring the petroleum measurement application (API feature)
The
API parameters
determine the values that will be used in API-related
calculations. The API parameters are available only if the petroleum measurement
application is enabled on your transmitter.
8.6.1
About the petroleum measurement application
The petroleum measurement 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.
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.
API parameters
The API parameters are listed and defined in Table 8-2.
Table 8-2
API parameters
Variable
Description
Table type
Specifies the table that will be used for reference temperature and reference density unit. Select
the table that matches your requirements. See
.
User defined TEC
(1)
(1) Configurable if Table Type is set to 6C, 24C, or 54C.
Thermal expansion coefficient. Enter the 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 transmitter
to use in general processing. To configure the temperature unit, see Section 6.4.4.
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 53
x
or 54
x
. If configurable:
• Specify the reference temperature to be used in CTL calculation.
• Enter reference temperature in °C.
• Model 2500 CIO
• Model 2700 AN
• Model 2700 IS
• Model 2700 CIO
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