VEGA VEGABAR 86 4 … 20 mA_HART - Operating Instructions - Manual (Page 64)

64
11 Supplement
VEGABAR 86 • 4 … 20 mA/HART
45039-EN-131010
Ʋ Second HART value (SV) Physical unit of the application
Ʋ Third HART value (TV) Measuring cell temperature
Ʋ Fourth HART value (QV) Electronics temperature
Output variable - Second current output
For details on the operating voltage see chapter "Voltage supply"
Output signal
4 … 20 mA (passive)
Range of the output signal 3.8 … 20.5 mA (default setting)
Signal resolution 0.3 µA
Failure signal current output (adjustable) Last valid measured value, ≥ 21 mA, ≤ 3.6 mA
Max. output current
21.5 mA
Starting current ≤ 10 mA for 5 ms after switching on, ≤ 3.6 mA
Load Load resistor, see chapter "Voltage supply"
Damping (63 % of the input variable),
adjustable
0 … 999 s
Dynamic behaviour output
Run-up time approx.
10 s
Dynamic characteristics, depending on medium, temperature and, if applicable, chemical seal
90 %
100 %
10 %
t
t
T A
t
t
S
2 1
Fig. 37: Behaviour in case of sudden change of the process variable. t
T
: dead time; t
A
: rise time; t
S
: jump response
time
1 Process variable
2 Output signal
Dead time > 45 ms
Rise time > 35 ms (10 … 90 %)
Step response time > 80 ms (ti: 0 s, 10 … 90 %)
Damping (63 % of the input variable) 0 … 999 s, adjustable
Additional output parameter - temperature
Processing is made via output signal HART multidrop, Profibus PA and Foundation Fieldbus
Range
-60 … +150 °C (-76 … +302 °F)