Emerson Micro Motion SGM - Configure Line Density Calculations Using Prolink III

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.
7.6 Configure line density calculations using ProLink III
ProLink III
Device Tools → Configuration → Process Measurement → Line Density
The line density parameters provide data for line density measurement. Line density can be reported as a
process variable. Line density is required to measure calorific value and energy flow.
Procedure
1. Choose Device Tools → Configuration → Process Measurement → Line Density.
2. Set Density Unit to the unit to be used for line density, and click Apply.
This unit is also used for base density.
3. Verify the value of Line Pressure.
4. Verify the value of Sample Temperature.
5. Set Base Pressure to the pressure value to which density measurements will be corrected (the
reference pressure).
The default is 1 bar absolute. There is no upper limit. You must be using absolute pressure.
This value is also used in base density measurement. Be sure that the value is appropriate for both
process variables.
6. Set Base Temperature to the temperature value to which density measurements will be corrected (the
reference temperature).
Configure process measurement using ProLink III Configuration and Use Manual
March 2021 MMI-20020954
58 Micro Motion Gas Specific Gravity Meters (SGM)