Emerson MMI-20019043 Manuel D’Utilisation

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 reported process variable. At the end of the interval, the reported process variable
will reflect 63% of the change in the actual measured value.

Set Density Damping to the value you want to use.

The default value is 1.6 seconds. The range depends on the core processor type and the
setting of Update Rate, as shown in the following table:

Update Rate

Density Damping

Standard

Normal

0 to 51.2 seconds

Special

0 to 10.24 seconds

Enhanced

Not applicable

0 to 40.96 seconds

Tips
•

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.

•

Whenever the damping value is non-zero, the reported measurement will lag the actual
measurement because the reported 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 reported value.

The value you enter is automaticaly rounded down to the nearest valid value. The valid
values for Density Damping depend on the setting of Update Rate.

Update Rate

Standard

Normal

0

, 0.2, 0.4, 0.8, ... 51.2

Special

0

, 0.04, 0.08, 0.16, ... 10.24

Enhanced

Not applicable

0

, 0.04, 0.08, 0.16, ... 40.96

Density Damping

 affects liquid volume measurement. Liquid volume values are calculated

from the damped density value rather than the measured density value. Density Damping
does not affect gas standard volume measurement.

Configure process measurement

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