VEGA VEGABAR 51 4 … 20 mA - Manual (Page 42)

42
10 Supplement
VEGABAR 51 • 4 … 20 mA
36712-EN-130321
Failure signal output current mA value unchanged 20.5 mA, 22 mA, < 3.6 mA (adjust-
able)
Max. output current 22 mA
Load see load diagram under Power supply
Met NAMUR recommendation NE 43
Dynamic behaviour output
Run-up time approx.
10 s
90 %
100 %
10 %
t
t
T A
t
t
S
2 1
Fig. 18: 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 %