VEGA VEGABAR 55 Foundation Fieldbus User Manual
Page 49
49
10 Supplement
VEGABAR 55 • Foundation Fieldbus
36736-EN-130321
Deviation determined according to the limit point method according to IEC 60770
10)
Applies to the digital signal output (HART, Profibus PA, Foundation Fieldbus) as well as to ana-
logue current output 4 … 20 mA and refers to the set span. Turn down (TD) is the ratio nominal
measuring range/set span.
Deviation with version 0.075 %
Ʋ Turn down 1 : 1 up to 5 : 1
< 0.075 %
Ʋ Turn down > 5 : 1
< 0.015 % x TD
Deviation with version 0.1 %
Ʋ Turn down 1 : 1 up to 5 : 1
< 0.1 %
Ʋ Turn down > 5 : 1
< 0.02 % x TD
Deviation with version 0.2 %
Ʋ Turn down 1 : 1 up to 5 : 1
< 0.2 %
Ʋ Turn down > 5 : 1
< 0.04 % x TD
Deviation with absolute pressure measuring range 0.1 bar
Ʋ Turn down 1 : 1 up to 5 : 1
< 0.25 %
Ʋ Turn down > 5 : 1
< 0.05 % x TD
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 ana-
logue 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):
Ʋ In the compensated temperature
range 0 … +100 °C (+32 … +212 °F)
< (0.05 % + 0.1 % x TD)
Ʋ Outside the compensated tempera-
ture range
< (0.05 % + 0.15 % x TD)
Thermal change, current output
Applies also to the analogue 4 … 20 mA current output and refers to the set span.
Thermal change, current output
< 0.05 %/10 K, max. < 0.15 %, each with -40 … +80 °C
(-40 … +176 °F)
0,15 %
-0,15 %
-40°C
-20°C
20°C
40°C
60°C
80°C
Fig. 27: Thermal change, current output
10)
Incl. non-linearity, hysteresis and non-repeatability.