Burkert Type 8644 - Manual (Page 113)

8644/phoenix - 109
S
YSTEM
D
ESCRIPTION
Sensitivity (degree of smoothing)
The diagram shows the step responses (from 1 to 0 / from 0 to 1) of the filter with various sensitivity
parameters (degrees of smoothing).
Explanation of the characteristic curves
The sensitivity parameter is the procentual weighting of the last measured pressure value.
Example:
Sensitivity parameter = 90 (see also 90 % characteristic)
The desired mean pressure value is calculated from the formula:
P
A
(k) = 0.1 P
A
(k-1) + 0.9 P
E
(k) or P
A
(k) = 10% P
A
(k-1) + 90% P
E
(k)
P
A
(k) is the mean pressure value to be calculated (filter output)
P
A
(k-1) is the last calculated mean pressure value (filter output) and
P
E
(k) is the previously measured pressure (filter input).
Sensitivity Explanation
parameter
10 Corresponds to the 10 % characteristic: filter is sluggish, very strong smoothing
P
A
(k) = 90 % P
A
(k-1) + 10 % P
E
(k)
50 Corresponds to the 50 % characteristic: strong smoothing
P
A
(k) = 50 % P
A
(k-1) + 50 % P
E
(k)
100 Corresponds to the 100 % characteristic: no smoothing
P
A
(k) = 0 % P
A
(k-1) + 100 % P
E
(k)
100%
1
0,8
0,6
0,4
0,2
0
h(0) h(1) h(2) h(3) h(4) h(5) h(6) h(7) h(8) h(9) h(10) h(1
1)
h(12) h(13) h(14) h(15) h(16) h(17) h(18) h(19) h(20) h(21) h(22) h(23) h(24) h(25) h(26) h(27) h(28) h(29)
90%
80%
70%
60%
50%
40%
30%
20%
10%
50%
60%
100%
90%
80%
70%
40% 30%
20%
10%
10% 20% 50% 60% 70% 80% 90% 30% 40% 100%