VEGA VEGABAR 61 Foundation Fieldbus User Manual
Page 54
Channel Numbers
-
Channel 1
Primary Value
-
Channel 2
Secondary Value 1
-
Channel 3
Secondary Value 2
-
Channel 4
Temperature Value
Transmission rate
31.25 Kbit/s
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. 28: 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 isolating diaphragms up to several seconds with capillary systems.
Example: Flange isolating diaphragm DN 80, filling silicone oil KN 2.2, capillary length 10 m,
measuring 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
54
VEGABAR
61 • Foundation Fieldbus
10 Supplement
28258
-EN
-081209