VEGA VEGABAR 86 Modbus and Levelmaster protocol - Operating Instructions - Manual (Page 57)

57
10 Supplement
VEGABAR 86 • Modbus and Levelmaster protocol
46296-EN-131107
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
Turn down (TD) is the relation nominal measuring range/adjusted span.
Ceramic 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 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)}
>>>Long-term stability (according to DIN 16086 and IEC 60770-1)
Specifications refer to the set span. Turn down (TD) is the ratio: nominal measuring range/set span.
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