Vega VEGABAR 52 Operating Instructions Manual page 58

10 Supplement
Turn down 1 : 1 up to 5 : 1
-
Turn down > 5 : 1
-
Influence of the product or ambient temperature
Thermal change zero signal and output span
Applies to the digital signal output (HART, Profibus PA, Foundation Fieldbus) as well as to
analogue current output 4 ... 20 mA and refers to the set span. Turn down (TD) is the ratio nominal
measuring range/set span.
Thermal change zero signal and output span, reference temperature 20 °C (68 °F):
In the compensated temperature range
-
0 ... +100 °C (+32 ... +212 °F)
Outside the compensated temperature
-
range
Thermal change zero signal and output span with absolute pressure measuring range 0.1 bar,
reference temperature 20 °C (68 °F):
In the compensated temperature range
-
0 ... +100 °C (+32 ... +212 °F)
Outside the compensated temperature
-
range
Thermal change, current output
Applies also to the analogue 4 ... 20 mA current output and refers to the set span.
Thermal change, current output
Fig. 28: Thermal change, current output
Long-term stability (according to DIN 16086, DINV 19259-1 and IEC 60770-1)
Applies to digital HART interface as well as to analogue current output 4 ... 20 mA under
reference conditions. Specifications refer to the set span. Turn down (TD) is the relation nominal
measuring range/set span.
Long-term drift of the zero signal:
58
0,15 %
-40°C -20°C
-0,15 %
< 0.25 %
< 0.05 % x TD
< (0.05 % + 0.1 % x TD)
< (0.05 % + 0.15 % x TD)
< (0.1 % + 0.1 % x TD)
< (0.15 % + 0.15 % x TD)
< 0.05 %/10 K, max. < 0.15 %, each with
-40 ... +80 °C (-40 ... +176 °F)
40°C 60°C
20°C
VEGABAR 52 • 4 ... 20 mA/HART
80°C