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: 1 g/cm3 = 0.578 oz/in3
3. Set Density Special Unit Conversion Factor to 0.578.
4. Set User-Defined Label to oz/in3.
4.2.2 Configure Density Damping
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ProLink III Device Tools > Configuration > Process Measurement > Line Density > Density Damping
Field Communicator Configure > Manual Setup > Measurements > Density > Density Damping
Overview
Density Damping controls the amount of damping that will be applied to the line density
value.
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
Density damping affects all process variables that are calculated from line density.
Procedure
Set Density Damping to the value you want to use.
The default value is 0 seconds. The range is 0 to 60 seconds.
Interaction between Density Damping and Added Damping
When the mA output is configured to report density, both Density Damping and Added
Damping are applied to the reported density value.
Density 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.
If mA Output Process Variable is set to Density, and both Density Damping and Added Damping are
set to non-zero values, density damping is applied first, and the added damping
calculation is applied to the result of the first calculation. This value is reported over the
mA output.
Configure process measurement
Configuration and Use Manual 25
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