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• If necessary, apply an offset.
Related information
Example: Using the Matrix Referral method
Configure referred viscosity measurement, Matrix Referral
method, using the Field Communicator
Field Communicator Configure > Manual Setup > Measurements > Optional Setup > Referred Viscosity
Overview
Referred viscosity is line viscosity corrected to a reference temperature. In other words, this
is the viscosity that the device would report if the line temperature matched the reference
temperature. The matrix referral method can be used for all process fluids. It is not based
on ASTM D341 standards.
You can set up referred viscosity calculations for up to six process fluids. You must set up at
least two.
Prerequisites
For each process fluid, you must know its viscosity at two or more temperatures. You must
use the same temperature values for all process fluids. You can enter up to six
temperature–viscosity pairs for each fluid.
Procedure
1. Choose Configure > Manual Setup > Measurements > Optional Setup > Referred Viscosity.
2. Set Referred Viscosity Calculation Method to Matrix Referral.
3. Choose Matrix Referral.
4. Set Matrix Data Unit to the viscosity unit that the referred density measurement will be
based on.
Important
• If the correct unit is not displayed, press Send to send the data to the transmitter, then
press Home, then return to this screen. This sequence writes the configuration data and
refreshes the screen. Dynamic viscosity is measured in cP. Kinematic viscosity is measured
in cSt.
• If you change the setting of Matrix Data Unit after entering viscosity data in the matrix, no
conversion is performed. You must re-enter the viscosity data using the new unit.
5. Set Reference Temperature to the temperature to which viscosity will be corrected.
The reference temperature must be within the temperature range of the matrix. It
does not need to match one of the temperature values used to build the matrix.
6. Build the viscosity matrix.
Configure process measurement
Configuration and Use Manual 49