Vega VEGABAR 87 Operating Instructions Manual page 64

11 Supplement
Influence of the installation position
Deviation in the current output due to
strong, high-frequency electromagnetic
fields acc. to EN 61326-1
Deviation (according to IEC 60770-1)
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 specified values correspond to the value F
Accuracy class
0.1 %
Influence of the medium or ambient 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 value F
Calculation of the total deviation (according to DIN 16086)".
Ceramic/Metal measuring cell - Standard
-12
Fig. 38: Basic temperature error F
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.
64
< 0.2 mbar/20 Pa (0.003 psig)
< ±150 µA
Non-linearity, hysteresis and repeata-
bility with TD 1 : 1 up to 5 : 1
< 0.1 %
at TD 1 : 1
TBasis
in chapter " Calculation of the total deviation".
Kl
Non-linearity, hysteresis and repeata-
bility with 5 : 1
< 0.02 % x TD
in chapter "
T
VEGABAR 87 • 4 ... 20 mA/HART