4-13
Transmitter Functions
Signal Processing Control
Signal Processing Control — On/Off
When ON is selected, the Model 8732C output is derived using a running
average of the individual flow inputs. This average is updated at the rate
of 12 samples per second regardless of the selected coil drive mode. The
three parameters that make up Signal Processing Control: Number of
samples, maximum percent limit, and time limit. They are described
individually below.
Number of Samples
0 to 125 Samples
The number of samples function sets the number of previous inputs
used to calculate the average value. Because the output stage of the
Model 8732C circuit is updated twelve times each second,
regardless of 6 or 30 Hz coil drive mode, the factory preset value of 90
samples equates to 7.5 seconds. For example, if you select a sample
number of 120, the response time of the system will be 10 seconds
(120 samples
÷
12 samples per second). A suggested nominal number of
90 samples is a good starting point for most applicable process fluids.
Maximum Percent Limit
0 to 100 Percent
The maximum percent limit is a tolerance band set up on either side
of the running average. The percentage value refers to deviation from
the running average. For example, if the running average is 100 gal/
min, and a 2 percent maximum limit is selected, then the acceptable
range is from 98 to 102 gal/min.
Values within the limit are accepted while values outside the limit are
analyzed to determine if they are a noise spike or an actual flow change.
Time Limit
0 to 256 Seconds
This 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.
For example, if the number of samples selected is 120, then the
response time of the system is 10 seconds. In some cases this may be
unacceptable. By setting the time limit, you can force the Model 8732C
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 2 seconds is a good starting point for most applicable
process fluids. The selected signal processing configuration may be
turned ON or OFF to suit your needs.
HART Fast Keys
1, 4, 4, 4
LOI
Detailed Setup
HART Fast Keys
1, 4, 4, 5
LOI
Detailed Setup
HART Fast Keys
1, 4, 4, 6
LOI
Detailed Setup
HART Fast Keys
1, 4, 4, 7
LOI
Detailed Setup
Содержание 8732C
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