The Concentration Measurement window is displayed. It is organized into steps that
allow you to perform several different setup and configuration tasks. For this task,
you will not use all the steps.
2. Scroll to Step 2, set Matrix Being Configured to the matrix you want to modify, and click
Change Matrix.
3. Scroll to Step 4.
4. Set up extrapolation alerts.
Each concentration matrix is built for a specific density range and a specific
temperature range. If line density or line temperature goes outside the range, the
transmitter will extrapolate concentration values. However, extrapolation may
affect accuracy. Extrapolation alerts are used to notify the operator that
extrapolation is occurring, and can also be used to initiate matrix switching. Each
concentration matrix has its own extrapolation alert settings.
a. Set Extrapolation Alert Limit to the point, in percent, at which an extrapolation alert
will be posted.
b. Enable or disable the high and low limit alerts for temperature and density, as
desired, and click Apply.
Important
If you plan to use matrix switching, you must enable the appropriate extrapolation alerts.
Example: If Extrapolation Alert Limit is set to 5%, High Extrapolation Limit (Temperature) is
enabled, and the matrix is built for a temperature range of 40 °F to 80 °F, an
extrapolation alert will be posted if line temperature goes above 82 °F.
5. If applicable, use the Equation Selection parameter to specify the type of calculation to
be used, and click Apply.
This option is available only when Derived Variable is set to Specific Gravity.
Option Description
Specific
Gravity
Referred density is calculated from the matrix. The result is used in the specific
gravity equation. The output is specific gravity.
Baume Specific gravity is calculated as described above, and the result is used in the
°Baumé equation. The output is specific gravity and °Baumé (light or heavy).
Brix Specific gravity is calculated as described above and the result is used in the
°Brix equation. The output is specific gravity and °Brix.
Plato Specific gravity is calculated as described above, and the result is used n the
°Plato equation. The output is specific gravity and °Plato.
Twaddell Specific gravity is calculated as described above, and the result is used in the
°Twaddell equation. The output is specific gravity and °Twaddell.
6. Enable or disable Matrix Switching as desired, and click Apply.
Configure process measurement
Configuration and Use Manual 53
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