Vega VEGABAR 86 Operating Instructions Manual page 55

Fig. 24: Behaviour in case of sudden change of the process variable. t
time
1 Process variable
2 Output signal
Dead time
Rise time
Step response time
Damping (63 % of the input variable)
Reference conditions and influencing variables (according to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
Ʋ Temperature
Ʋ Relative humidity
Ʋ Air pressure
Determination of characteristics
Characteristic curve
Reference installation position
Influence of the installation position
Deviation in the current output due to
strong, high-frequency electromagnetic
fields acc. to EN 61326-1
Deviation (according to IEC 60770-1)
Applies to the digital signal output (HART, Profibus PA, Foundation Fieldbus) as well as to the ana-
logue current output 4 ... 20 mA and refers to the set span. Turn down (TD) is the ratio "nominal
measuring range/set span".
The specified values correspond to the value F
Accuracy class
0.1 %
VEGABAR 86 • 4 ... 20 mA
100 %
90 %
1
10 %
t
T
Non-linearity, hysteresis and repeata-
bility with TD 1 : 1 up to 5 : 1
< 0.1 %
2
t
A
t
S
: dead time; t
T
≤ 50 ms
≤ 150 ms
≤ 200 ms (ti: 0 s, 10 ... 90 %)
0 ... 999 s, adjustable via menu item " Damping"
+15 ... +25 °C (+59 ... +77 °F)
45 ... 75 %
860 ... 1060 mbar/86 ... 106 kPa (12.5 ... 15.4 psig)
Limit point adjustment according to IEC 61298-2
Linear
upright, diaphragm points downward
< 0.2 mbar/20 Pa (0.003 psig)
< ±150 µA
in chapter " Calculation of the total deviation".
Kl
Non-linearity, hysteresis and repeata-
bility with 5 : 1
< 0.02 % x TD
11 Supplement
t
: rise time; t : jump response
A S
55