Example: 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 the
Field Communicator
Field Communicator Configure > Manual Setup > Measurements > Density > Density Damping
Overview
Damping controls the amount of damping that will be applied to the core process variable:
specific gravity, molecular weight, or relative density.
Damping is used to smooth out small, rapid fluctuations in process measurement.
Damping Value specifies the time period (in seconds) over which the transmitter will
spread changes in the process variable. At the end of the interval, the internal value will
reflect 63% of the change in the actual measured value.
Tip
Damping affects all process variables that are calculated from the core process variable: specific
gravity, molecular weight, or relative density.
Procedure
Set Damping to the value you want to use.
The default value is 1.6 seconds. The range is 0 to 440 seconds.
Interaction between Damping and Added Damping
When the mA output is configured to report the core process variable (specific gravity,
molecular weight, or relative density), both Damping and Added Damping are applied to
the reported value.
Damping controls the rate of change in the value of the process variable in transmitter
memory. Added Damping controls the rate of change reported via the mA output.
Configure process measurement using the Field Communicator
Configuration and Use Manual 73
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