VEGA VEGABAR 87 4 … 20 mA_HART - Operating Instructions - Manual (Page 65)

65
11 Supplement
VEGABAR 87 • 4 … 20 mA/HART
45044-EN-131010
Characterstic 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 digital signal output (HART, Profibus PA, Foundation Fieldbus) as well as to the
analogue current output 4 … 20 mA and refers to the set span. Turn down (TD) is the ratio nominal
measuring range/set span.
The specified values correspond to the value F
Kl
in chapter "Calculation of the total deviation".
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
0.1 % < 0.1 % < 0.02 % 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 the
analogue current output 4 … 20 mA and refers to the set span. Turn down (TD) is the ratio nominal
measuring range/set span.
The thermal change of zero signal and output span corresponds to the value F
T
in chapter "Calcu-
lation of the total deviation (according to DIN 16086)".
Ceramic/Metal measuring cell - Standard
Medium or ambient temperature T
-40 … 0 °C (-40 … +32 °F)
< {0.15 % + 0.015 %/K x (-T)} x {0.5+0.5 x TD}
0 … +40 °C (+32 … +104 °F) < {0.0075 %/K x (T - 20 °C)} x {0.5+0.5 x TD}
+40 … +100 °C (+104 … +212 °F) < {0.15 % } x {0.5+0.5 x TD}
+100 … +120 °C (+212 … +248 °F) < {0.15 % + 0.005 %/K x (T - 100 °C)} x {0.5+0.5 x TD}
Ceramic/Metal measuring cell - climate-compensated
Compensated temperature range
0 … +100 °C (+32 … +212 °F)
Non-compensated temperature range -40 … 0 °C (-40 … +32 °F), -100 … 130 °C
(212 … +276 °F)
Nominal measuring range in bar/
kPa
Nominal measuring
range in psig
In the compensated
temperature range
In the non-compen-
sated temperature
range
0 … 10 bar/0 … 1000 kPa 0 … 150 psig
< {0.05 % + 0.1 x
(0.5+0.5 x TD)}
< {0.1 % + 0.15 x
(0.5+0.5 x TD)}
0 … 25 bar/0 … 2500 kPa 0 … 350 psig
0 … 1 bar/0 … 100 kPa 0 … 15 psig
< {0.1 % + 0.2 x
(0.5+0.5 x TD)}
< {0.1 % + 0.3 x
(0.5+0.5 x TD)}
0 … 2.5 bar/0 … 250 kPa 0 … 35 psig
0 … 0.4 bar/0 … 40 kPa 0 … 6 psig < {0.15 % + 0.4 x
(0.5+0.5 x TD)}
< {0.15 % + 0.6 x
(0.5+0.5 x TD)}
Thermal change, current output
Applies also to the analogue 4 … 20 mA current output and refers to the set span.