VEGA VEGABAR 51 Profibus PA User Manual
Page 47
47
10 Supplement
VEGABAR 51 • Profibus PA
36714-EN-130321
Current value
10 mA, ±0.5 mA
Dynamic behaviour output
Run-up time approx.
10 s
90 %
100 %
10 %
t
t
T
A
t
t
S
2
1
Fig. 26: Sudden change of the process variable, dead time t
T
, rise time t
A
and step response time t
S
1 Process variable
2 Output signal
Dead time
≤ 150 ms
Rise time
≤ 100 ms (10 … 90 %)
Step response time
≤ 250 ms (ti: 0 s, 10 … 90 %)
To this amounts the reaction time of the isolatng system. This time varies from values < 1 s with
compact chemical seals to several seconds with capillary systems.
Example: Flange-type chemical seal DN 80, filling silicone oil KN 2.2, capillary length 10 m, meas-
uring range 1 bar
Process temperature
Reaction time
40 °C
approx. 2 s
20 °C
approx. 3 s
-20 °C
approx. 11 s
Damping (63 % of the input variable)
0 … 999 s, adjustable
Input variable
Adjustment
Adjustment range of the min./max. adjustment relating to the nominal measuring range:
Ʋ Percentage value
-10 … 110 %
Ʋ Pressure value
-20 … 120 %
Adjustment range of the zero/span adjustment relating to the nominal measuring range:
Ʋ zero
-20 … +95 %
Ʋ Span
-120 … +120 %
9)
Ʋ Difference between zero and span
max. 120 % of the nominal range
Adjustment range with measuring ranges from 100 bar, relating to the nominal measuring range:
9)
Values less than -1 bar cannot be set.