Unit description
Label
Display ProLink III Field communicator
Degrees API D API degAPI degAPI
Special unit SPECL special Spcl
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.
2. Calculate Density Special Unit Conversion Factor as follows:
a) x base units = y special units
b) Density Special Unit Conversion Factor = x÷y
3. Enter Density Special Unit Conversion Factor.
The original density value is divided by this conversion factor.
4. Set User-Defined Label to the name you want to use for the density unit.
The special measurement unit is stored in the transmitter. You can configure the transmitter to use the
special measurement unit at any time.
Defining a special measurement unit for density
You want to measure density in ounces per cubic inch.
1. Set Density Special Unit Base to g/cm3.
2. Calculate Density Special Unit Conversion Factor:
a. 1 g/cm3 = 0.578 oz/in3
b. 1÷0.578 = 1.73
3. Set Density Special Unit Conversion Factor to 1.73.
4. Set User-Defined Label to oz/in3.
8.1.2 Configure Density Damping using a field communicator
Field communicator
Configure → Manual Setup → Measurements → Density → Density Damping
Configure process measurement using a field communicator Configuration and Use Manual
March 2021 MMI-20020954
66 Micro Motion Gas Specific Gravity Meters (SGM)
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