Interaction between mA Output Cutoff and process variable cutoffs
When mA Output Process Variable is set to a flow variable (for example, mass flow rate or volume flow rate),
mA Output Cutoff interacts with Mass Flow Cutoff or Volume Flow Cutoff. The transmitter puts the cutoff into
effect at the highest flow rate at which a cutoff is applicable.
8.4.5 Configure mA Output Damping
Display Menu → Configuration → Inputs/Outputs → Channel B → I/O Settings → MAO Damping
ProLink III Device Tools → Configuration → I/O → Outputs → mA Output → Added Damping
Field communicator Device Settings → Inputs/Outputs → mA Output x → mAO x Settings → Added Damping
mA Output Damping controls the amount of damping that will be applied to the mA Output.
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 value reported by an mA Output will reflect 63% of the change in the actual
measured value.
mA Output Damping affects a process variable only when it is reported via the mA Output. If the process
variable is read from the display or digitally, mA Output Damping is not applied. For most applications, leaving
the mA Output Damping at 0.0 seconds should suffice. Change the Process Variable Damping first.
Procedure
Set mA Output Damping to the desired value.
• Default: 0.0 seconds
• Range: 0.0 to 440 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 the process variable assigned to an
mA Output 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.
Interaction between mA Output Damping and process variable damping
When mA Output Source is set to a flow rate variable, density, or temperature, mA Output Damping
interacts with Flow Damping, Density Damping, or Temperature Damping. If multiple damping parameters
are applicable, the effect of damping the process variable is calculated first, and the mA Output damping
calculation is applied to the result of that calculation.
Example: Damping interaction
Configuration:
• Flow Damping = 1 second
• mA Output Source = Mass Flow Rate
Integrate the meter with the control system Configuration and Use Manual
May2024 MS-00809-0200-1600
104 Emerson.com
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