Vega VEGABAR 82, Руководство по эксплуатации

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67
11 Supplement
VEGABAR 82 • Profibus PA
45031-EN-220624
Determination of characteristics Limit point adjustment according to IEC 61298-2
Characteristic 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 60770-1)
Specifications refer to the set span. Turn down (TD) is the ratio: nominal measuring range/set span.
Accuracy class Non-linearity, hysteresis and repeata-
bility with TD 1 : 1 up to 5 : 1
Non-linearity, hysteresis and repeata-
bility with 5 : 1
0.05 % < 0.05 % < 0.01 % x TD
0.1 % < 0.1 % < 0.02 % x TD
0.2 % < 0.2 % < 0.04 % x TD
Influence of the product temperature
Thermal change zero signal and output span through product temperature
Applies to the digital signal output (HART, Profibus PA, Foundation Fieldbus) as well as to the ana-
logue 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 the zero signal and output span corresponds to the temperature error F
T
in
chapter " Calculation of the total deviation (according to DIN 16086) ".
Basic temperature error F
T
(
F
TBasi
s
Fig. 43: Basic temperature error F
TBasis
at TD 1 : 1
The basic temperature error in % from the above graphic can increase due to the additional factors,
depending on the measuring cell version (factor FMZ) and the Turn Down (factor FTD). The ad-
ditional factors are listed in the following tables.
Additional factor through measuring cell version
Measuring cell version
Measuring cell standard, depending on the accuracy class
0.05 %, 0.1 % 0.2 % (with measuring
range 0.1 bar
abs
)
0.2 %
0.05 %, 0.1 % with meas-
uring range 25 mbar
Factor FMZ 1 2 3