45
13 Supplement
VEGABAR 28 • Three-wire 1 x transistor or 4 … 20 mA
57534-EN-220826
Reaction time transistor output with
switching relevant change of the process
variable total
≤ 10 ms
Damping (63 % of the input variable)
0 … 9 s, adjustable
Reference conditions and influencing 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
Characteristic curve
Linear
Reference installation position
upright, diaphragm points downward
Influence of the installation position
< 0.2 mbar/20 Pa (0.003 psig)
Deviation (according to IEC 60770)
Applies to the 4 … 20 mA current output and refers to the adjusted span. 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
0.3 %
< 0.3 %
< 0.06 % x TD
Influence of the medium or ambient temperature
Average temperature coefficient of the zero signal
Ʋ In the compensated temperature
range
8)
< 0.15 %/10 K
Ʋ Outside the compensated tempera-
ture range typ.
0.3 %/10 K
20°C
-40°C
100°C
1,5 %
1,2 %
-1,5 %
-1,2 %
Fig. 28: Temperature error with TD 1 : 1
8) 0 … +100 °C (+32 … +212 °F)