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Reference Manual
00809-0100-4444, Rev AC
Section 7: Digital Signal Processing
January 2015
Digital Signal Processing
Status
Enable or disable the DSP capabilities. When ON is selected, the Rosemount 8732EM output is
derived using a running average of the individual flow inputs. Signal processing is a software
algorithm that examines the quality of the electrode signal against user-specified tolerances.
The three parameters that make up signal processing (number of samples, maximum percent
limit, and time limit) are described below.
Number of samples
The number of samples sets the amount of time that inputs are collected and used to calculate
the average value. Each second is divided into tenths with the number of samples equaling the
number of increments used to calculate the average. This parameter can be configured for an
integer value between 1 and 125. The default value is 90 samples.
For example:
A value of 1 averages the inputs over the past
1
/
10
second
A value of 10 averages the inputs over the past 1 second
A value of 100 averages the inputs over the past 10 seconds
A value of 125 averages the inputs over the past 12.5 seconds
Percent limit
This parameter will set the tolerance band on either side of the running average, referring to
percent deviation from the average. Values within the limit are accepted while value outside the
limit are scrutinized to determine if they are a noise spike or an actual flow change. This
parameter can be configured for an integer value between 0 and 100 percent. The default value
is 2 percent.
LOI menu path
Device Setup, Detailed Setup, Signal Processing, Main Config DSP, Status
Traditional fast keys
1,4,4,2,1
Device dashboard 2,2,8,6,1
LOI menu path
Device Setup, Detailed Setup, Signal Processing, Main Config DSP, Samples
Traditional fast keys 1,4,4,2,2
Device dashboard
2,2,8,6,2
LOI menu path Device Setup, Detailed Setup, Signal Processing, Main Config DSP, % Limit
Traditional fast keys 1,4,4,2,3
Device dashboard
2,2,8,6,3