4. Set Base Temperature to the temperature value to which density measurements will be corrected (the
reference temperature).
The default is 20 °C. The range is −50 °C to +200 °C.
This value is also used in line density measurement. Be sure that the value is appropriate for both
process variables.
5. (Relative density meters only) Set Density of Air to the value to be used in your application.
Enter the value in the configured measurement unit. The default is 0.000122305 g/cm³. The range is
0.0001 g/cm³ to 0.00015 g/cm³.
7.5.1 Options for Density Measurement Unit
The transmitter provides a standard set of measurement units for Density Measurement Unit. Different
communications tools may use different labels.
Unit description
Label
Display ProLink III Field communicator
Grams per cubic centimeter G/CM3 g/cm3 g/Cucm
Grams per liter G/L g/l g/L
Grams per milliliter G/mL g/ml g/mL
Kilograms per liter KG/L kg/l kg/L
Kilograms per cubic meter KG/M3 kg/m3 kg/Cum
Pounds per U.S. gallon LB/GAL lbs/Usgal lb/gal
Pounds per cubic foot LB/CUF lbs/ft3 lb/Cuft
Pounds per cubic inch LB/CUI lbs/in3 lb/CuIn
Short ton per cubic yard ST/CUY sT/yd3 STon/Cuyd
Degrees API D API degAPI degAPI
Special unit SPECL special Spcl
7.5.2 Define a special measurement unit for density
ProLink III
Device Tools → Configuration → Process Measurement → Line Density → Special Units
Field communicator Configure → Manual Setup → Measurements → Optional Setup → Special Units
A special measurement unit is a user-defined unit of measure that allows you to report process data in a unit
that is not available in the transmitter. A special measurement unit is calculated from an existing
measurement unit using a conversion factor.
Procedure
1. Specify Density Special Unit Base.
Density Special Unit Base is the existing density unit that the special unit will be based on.
Configuration and Use Manual Configure process measurement using ProLink III
MMI-20020954 March 2021
Configuration and Use Manual 57
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