109
Reference Manual
00809-0300-4750, Rev CA
Advanced Configuration Functionality
March 2016
Advanced Configuration Functionality
Signal processing control
DSP can be turned on or off. When
on
is selected, the Rosemount 8750W output is derived
using a running average of the individual flow inputs. DSP is a software algorithm that
examines the quality of the electrode signal against user-specified tolerances. This average
is updated at the rate of 10 samples per second with a coil drive frequency of 5 Hz, and 75
samples per second with a coil drive frequency of 37 Hz. The three parameters that make up
signal processing (
number of samples, percent limit,
and
time limit
) are described below.
Number of samples
The
number of sample
s 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 0 and 125. The default value is 90 samples.
Percent rate
This parameter will set the tolerance band on either side of the running average, referring to
percent deviation from the average flow rate. Values within the limit are accepted while
values 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.
Time limit
LOI menu path
Field Mount: Detailed Setup, Sig Processing, SP Control
Wall Mount: AUX. FUNCTION, Signal Processing
Traditional Fast Keys
1, 4, 3, 1
Device dashboard
2, 2, 8, 6, 1
LOI menu path
Field Mount: Detailed Setup, Sig Processing, SP Control, Samples
Wall Mount: AUX. FUNCTION, Signal Processing
Traditional Fast Keys
1, 4, 3, 1
Device dashboard
2, 2, 8, 6, 2
LOI menu path
Field Mount: Detailed Setup, Sig Processing, SP Control, % Rate
Wall Mount: AUX. FUNCTION, Signal Processing
Traditional Fast Keys
1, 4, 3, 1
Device dashboard
2, 2, 8, 6, 3
LOI menu path
Field Mount: Detailed Setup, Sig Processing, SP Control, Time Limit
Wall Mount: AUX. FUNCTION, Signal Processing
Traditional Fast Keys
1, 4, 3, 1
Device dashboard
2, 2, 8, 6, 4
Summary of Contents for Rosemount 8750W
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