5.1.5 Process variables from the API referral application
The API referral application calculates several different process variables according to API standards.
CTPL
Correction factor based on line temperature and line pressure. CTPL is applied when
the API referral application is configured for an A, B, C, or D table.
CTL
Correction factor based on line temperature and pressure at saturation conditions.
CTL is applied when the API referral application is configured for an E table.
Referred density
The measured density after CTL or CTPL has been applied.
API volume flow
The measured volume flow rate after CTL or CTPL has been applied. Also called
temperature-corrected volume flow.
Batch-weighted
average density
One density value is recorded for each unit of flow (e.g., barrel, liter). The average is
calculated from these values. The average is reset when the API totalizer is reset. Not
available unless a totalizer has been configured with Source set to Temperature-
Corrected Volume Flow.
Batch-weighted
average
temperature
One temperature value is recorded for each unit of flow (e.g., barrel, liter). The
average is calculated from these values. The average is reset when the API totalizer is
reset. Not available unless a totalizer has been configured with Source set to
Temperature-Corrected Volume Flow.
API volume total
The total API volume measured by the transmitter since the last API totalizer reset.
Also called temperature-corrected volume total. Not available unless a totalizer has
been configured with Source set to Temperature-Corrected Volume Flow.
API volume
inventory
The total API volume measured by the transmitter since the last API inventory reset.
Also called temperature-corrected volume inventory. Not available unless an inventory
has been configured with Source set to Temperature-Corrected Volume Flow.
5.2 Set up concentration measurement
The concentration measurement application calculates concentration from line density and line temperature.
5.2.1 Preparing to set up concentration measurement
The procedure for setting up concentration measurement application depends on how your device was
ordered and how you want to use the application. Review this information before you begin.
Requirements for concentration measurement
To use the concentration measurement application, the following conditions must be met:
• The concentration measurement application must be enabled.
• The API Referral application must be disabled.
• The advanced phase measurement application must be disabled.
• A concentration matrix must be loaded into one of the six slots on the transmitter.
Tip
In most cases, the concentration matrix that you ordered was loaded at the factory. If it was not, you have
several options for loading a matrix. You can also build a matrix.
Configure process measurement applications Configuration and Use Manual
April 2019 MMI-20048166
56 Micro Motion 4200 Transmitters
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