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10.3 Change-rata limit
10.3.1
Outline of change-rate limit function
In the event of a sudden change in the density or a sudden variation in the output due to intrusion by
bubbles, etc., this function is used to exclude these signals to restrain the sudden output change. By
setting two measurement conditions of permissible variation width and limit times, the conditions for
change-rate limit are set.
It is possible to set 0.00 to 9.99(%TS) as the permissible variation width and 0 to 99 times as the limit
times. Setting the limit times to zero means that no change-rate limit is imposed.
10.3.2
Examples of operating the change-rate limit function
The change-rate limit function is described with examples below.
<Setting conditions>
The setting conditions shall be as follows.
•
Width of change-rate limit function: 0.5%TS
•
Times of change-rate limit function: Twice
The conditions that are set as above mean the following.
1)
All the variations within 0.5%TS are permitted and output without modification.
2)
Variations exceeding 0.5%TS are limited up to twice, outputting the immediately preceding
signal in place of the relevant signals.
3)
Variations in excess of 0.5%TS which continue three times are judged to be signal variations
resulting from actual density variations, thus outputting the 3rd signal without modification.
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1
2
3
Fig.10.3.1 Original Signal
Example 1: Operation for temporary and sudden signal variation
4
5
6
7
8
Signal No..
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1
9
10
Fig.10.3.2 Output Signal After Variation Factor
83
6 F 8 A 0 7 8 7
2
3
4
5
6
7
Signal No..
Restriction
8
9
10
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