VEGA VEGABAR 61 4 … 20 mA_HART - Manual (Page 56)

S ignal resolution 1.6 µA
F
ailure signal current output (adjustable) mA-value unchanged 20.5 mA, 22 mA, < 3.6 mA
M ax. output current 22 mA
L oad see load diagram under Power supply
F ulfilled NAMUR recommendations NE 43
Dynamic behaviour output
R un-up time approx. 10 s
90 %
100 %
10 %
t
t
T A
t
t
S
2 1
Fig. 29: 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
D ead time ≤ 150 ms
R ise time
≤ 100 ms (10 … 90 %)
S tep response time ≤ 250 ms (ti: 0 s, 10 … 90 %)
T o 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.
E xample: 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
D amping (63 % of the input variable) 0 … 999 s, adjustable
Input variable
Adjustment
56 VEGABAR 61 • 4 … 20 mA/HART
10 S upplement
27519
-EN
-081209