VEGA VEGABAR 81 Modbus and Levelmaster protocol - Operating Instructions - Manual (Page 58)

58
10 Supplement
VEGABAR 81 • Modbus and Levelmaster protocol
46293-EN-131107
90 %
100 %
10 %
t
t
T A
t
t
S
2 1
Fig. 32: 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 depending on the chemical seal version
Deviation (according to IEC 60770)
Turn down (TD) is the relation nominal measuring range/adjusted 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
0.2 % < 0.2 % < 0.04 % 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.
Average temperature coefficient,
zero signal
In the compensated tem-
perature range 10 … +70 °C
(+50 … +158 °F)
Outside the compensated tem-
perature range
Turn down 1 : 1 < 0.05 %/10 K typ. < 0.05 %/10 K