VEGA VEGABAR 87 Profibus PA - Operating Instructions User Manual
Page 59
59
11 Supplement
VEGABAR 87 • Profibus PA
45047-EN-131107
90 %
100 %
10 %
t
t
T
A
t
t
S
2
1
Fig. 33: 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, Foundation Fieldbus and
Modbus
Range
-60 … +150 °C (-76 … +302 °F)
Resolution
< 0.2 K
Accuracy
Ʋ in the range of 0 … +100 °C
(+32 … +212 °F)
±2 K
Ʋ In the range of -60 … 0 °C
(-76 … +32 °F) and +100 … +150 °C
(+212 … +302 °F)
typ. ±4 K
Reference conditions and actuating variables (according to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
Ʋ Temperature
+15 … +25 °C (+59 … +77 °F)
Ʋ Relative humidity
45 … 75 %
Ʋ Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
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
< 0.2 mbar/20 Pa (0.003 psig)