VEGA VEGABAR 81 Profibus PA - Operating Instructions User Manual
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11 Supplement
VEGABAR 81 • Profibus PA
45020-EN-131107
Current value
Ʋ Non-Ex and Ex ia instrument
10 mA, ±0.5 mA
Ʋ Ex-d instruments
16 mA, ±0.5 mA
Resolution, digital
< 1 mm (0.039 in)
Dynamic behaviour output
Run-up time approx.
10 s
90 %
100 %
10 %
t
t
T
A
t
t
S
2
1
Fig. 37: 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
Reference conditions and actuating variables (according to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
Ʋ Temperature
+18 … +30 °C (+64 … +86 °F)
Ʋ Relative humidity
45 … 75 %
Ʋ Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psi)
Determination of characteristics
Limit point adjustment according to IEC 61298-2
Characterstic curve
Linear
Reference installation position
upright, diaphragm points downward
Influence of the installation position
depending on the chemical seal version
Deviation (according to IEC 60770)
Turn down (TD) is the relation nominal measuring range/adjusted span.
Accuracy class
Non-linearity, hysteresis and re-
peatability with TD 1 : 1 up to 5 : 1
Non-linearity, hysteresis and re-
peatability with 5 : 1
0.2 %
< 0.2 %
< 0.04 % x TD