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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. Choose Online > Configure > Alert Setup > Concentration Measurement Alerts.
c. Enable or disable the high and low alerts for temperature and density, as desired.
Important
If you are using 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. Choose Configure > Manual Setup > Measurements > Concentration Measurement > CM
Configuration, then enable or disable Matrix Switching as desired.
When matrix switching is enabled and an extrapolation alert occurs, the transmitter
automatically switches from the matrix in Slot 1 to the matrix in Slot 2, or vice versa.
This occurs only if no extrapolation alert would be generated by the other matrix.
Matrix switching is not applicable to any other slots.
Related information
Using equations to calculate specific gravity, °Baumé, °Brix, °Plato, and °Twaddell
Matrix switching
Select the active concentration matrix using the
Field Communicator
You must select the concentration matrix to be used for measurement. Although the
transmitter can store up to six concentration matrices, only one matrix can be used for
measurement at any one time.
Set Active Matrix to the matrix you want to use.
Related information
Matrix switching
4.8.4 Using equations to calculate specific gravity, °Baumé,
°Brix, °Plato, and °Twaddell
Whenever the derived variable is set to Specific Gravity, you have the option of using
equations to calculate °Baumé, °Brix,°Plato, and °Twaddell, instead of matrix referral.
Whenever the equation method is used, the active matrix is used to measure referred
Configure process measurement
Configuration and Use Manual 79