54
10 Supplement
VEGABAR 87 • Modbus and Levelmaster protocol
46297-EN-220624
Ʋ Relative humidity
45 … 75 %
Ʋ Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
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 in the current output due to
strong, high-frequency electromagnetic
fields acc. to EN 61326-1
< ±150 µA
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
0.1 %
< 0.1 %
< 0.02 % x TD
Influence of the product temperature
Thermal change zero signal and output span
Turn down (TD) is the relation nominal measuring range/adjusted span.
Ceramic/Metal measuring cell - Standard
(
-12
Fig. 27: 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.
