VEGA VEGABAR 86 4 … 20 mA - Operating Instructions - Manual (Page 58)

58
11 Supplement
VEGABAR 86 • 4 … 20 mA
45506-EN-131010
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)
The thermal change of the current output corresponds to the value F
a
in chapter "Calculation of the
total deviation (according to DIN 16086)".
0,15 %
-0,15 %
-40°C -20°C
20°C
40°C 60°C 80°C
Fig. 26: Thermal change, current output
Long-term stability (according to DIN 16086 and IEC 60770-1)
Applies to the digital signal output (HART, Profibus PA, Foundation Fieldbus) as well as to the
analogue current output 4 … 20 mA under reference conditions. The specifications refer to the set
span. Turn down (TD) is the ratio nominal measuring range/set span.
The long-term drift of the zero signal corresponds to the value F
Stab
in chapter "Calculation of the
total deviation (according to DIN 16086)".
Long-term drift of the zero signal
Time period All measuring ranges Measuring range
0 … +0.025 bar/0 … +2.5 kPa
One year < 0.05 % x TD < 0.1 % x TD
Five years < 0.1 % x TD < 0.2 % x TD
Ten years < 0.2 % x TD < 0.4 % x TD
Long-term drift of the zero signal - Version climate-compensated
Nominal measuring range in bar/kPa Nominal measuring range
in psig
Long-term drift of the ze-
ro signal
0 … 10 bar/0 … 1000 kPa 0 … 150 psig
< (0.1 % x TD)/year
0 … 25 bar/0 … 2500 kPa 0 … 350 psig
0 … 1 bar/0 … 100 kPa 0 … 15 psig
< (0.25 % x TD)/year
0 … 2.5 bar/0 … 250 kPa 0 … 35 psig
0 … 0.4 bar/0 … 40 kPa 0 … 6 psig < (1 % x TD)/year