144
Reference Manual
00809-0300-4750, Rev CA
March 2016
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.
Time limit
The
time limit
parameter forces the output and running average values to the new value of
an actual flow rate change that is outside the
percent limit
boundaries. It thereby limits
response time to flow changes to the time limit value rather than the length of the running
average.
If the number of samples selected is 100, then the response time of the system is 10
seconds. In some cases this may be unacceptable. Setting the
time limit
forces the
Rosemount 8750W to clear the value of the running average and re-establish the output
and average at the new flow rate once the time limit has elapsed. This parameter limits the
response time added to the loop. A suggested time limit value of two seconds is a good
starting point for most applicable process fluids. This parameter can be configured for a
value between 0.6 and 256 seconds. The default value is 2 seconds.
LOI menu path
Field Mount: Device Setup, Detailed Setup, Signal Processing, Main Config
DSP, % Limit
Wall Mount: AUX. FUNCTION
Traditional Fast Keys
1, 4, 4, 2, 3
Device dashboard
2, 2, 8, 6, 3
LOI menu path
Field Mount: Device Setup, Detailed Setup, Signal Processing, Main Config
DSP, Time Limit
Wall Mount: AUX. FUNCTION
Traditional Fast Keys
1, 4, 4, 2, 4
Device dashboard
2, 2, 8, 6, 4
Содержание Rosemount 8750W
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