42
13 Supplement
VEGABAR 29 • Two-wire 4 … 20 mA
57087-EN-210301
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
Characteristic curve
Linear
Reference installation position
upright, diaphragm points downward
Influence of the installation position
≤ 5 mbar/0.5 kPa (0.073 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
7)
< 0.15 %/10 K
Ʋ
Outside the compensated tempera-
ture range typ.
0.3 %/10 K
20°C
-40°C
100°C
1,2 %
-1,2 %
Fig. 27: Temperature error with TD 1 : 1
Long-term stability (according to DIN 16086)
Specifications refer to the set span. Turn down (TD) is the ratio: nominal measuring range/set span.
Time period
Long-term drift zero signal and output span
One year
< 0.1 % x TD
Two years
< 0.15 % x TD
Five years
< 0.2 % x TD
7)
0 … +100 °C (+32 … +212 °F)