Unit description
Label
Display
ProLink III
FC
Pounds per cubic foot
lb/ft3
lbs/ft3
lb/Cuft
Pounds per cubic inch
lb/in3
lbs/in3
lb/CuIn
Degrees API
API
API
degAPI
Short ton per cubic yard
STon/yd3
sT/yd3
STon/Cuyd
(1)
Non-standard calculation. This value represents line density divided by the density of water at 60 °F (15.6 °C).
4.5.2 Configure Density Damping
Display
Menu
>
Configuration
>
Process Measurement
>
Density
>
Damping
ProLink III
Device Tools
>
Configuration
>
Process Measurement
>
Density
>
Density Damping
Field Communicator
Configure
>
Manual Setup
>
Measurements
>
Density
>
Density Damping
Density Damping
controls the amount of damping that will be applied to density data.
Damping is used to smooth out small, rapid fluctuations in process measurement. The 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 of the process variable (the damped value) will reflect 63% of the
change in the actual measured value.
Procedure
Set
Density Damping
to the desired value.
•
Default: 1.28 seconds
•
Range: 0.0 to 60 seconds
Tip
•
A high damping value makes the process variable appear smoother because the reported value changes
slowly.
•
A low damping value makes the process variable appear more erratic because the reported value changes
more quickly.
•
The combination of a high damping value and rapid, large changes in density can result in increased
measurement error.
•
Whenever the damping value is non-zero, the damped value will lag the actual measurement because the
damped value is being averaged over time.
•
In general, lower damping values are preferable because there is less chance of data loss, and less lag time
between the actual measurement and the damped value.
•
If a number greater than 60 is entered, it is automatically changed to 60.
Configuration and Use Manual
Configure process measurement
MMI-20025166
March 2019
Configuration and Use Manual
47