VEGA VEGABAR 83 Modbus and Levelmaster protocol - Operating Instructions - Manual (Page 61)

61
10 Supplement
VEGABAR 83 • Modbus and Levelmaster protocol
46295-EN-131107
90 %
100 %
10 %
t
t
T A
t
t
S
2 1
Fig. 32: Behaviour in case of sudden change of the process variable. t
T
: dead time; t
A
: rise time; t
S
: jump response
time
1 Process variable
2 Output signal
Dead time < 45 ms
Rise time > 35 ms (10 … 90 %)
Step response time > 80 ms (ti: 0 s, 10 … 90 %)
Damping (63 % of the input variable) 0 … 999 s, adjustable
Reference conditions and actuating variables (according to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
Ʋ Temperature +18 … +30 °C (+64 … +86 °F)
Ʋ Relative humidity 45 … 75 %
Ʋ Air pressure 860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psi)
Determination of characteristics Limit point adjustment according to IEC 61298-2
Characterstic curve Linear
Reference installation position upright, diaphragm points downward
Influence of the installation position
Ʋ Piezoresistive/strain gauge measur-
ing cell
depending on the process fitting and the chemical seal
Ʋ METEC ® measuring cell < 5 mbar/0.5 kPa (0.07 psig)
Deviation (according to IEC 60770)
Specifications refer to the set span. Turn down (TD) is the ratio: nominal measuring range/set span.
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
0.075 % < 0.075 % < 0.015 % x TD
0.1 % < 0.1 % < 0.02 % x TD
0.2 % < 0.2 % < 0.04 % x TD
Influence of the product or ambient temperature
Thermal change zero signal and output span