Vega VEGAPULS C 21 - Page 46

46
14 Supplement
VEGAPULS C 21 • Modbus and Levelmaster protocol
58343-EN-200806
2
1
Fig. 26: Data of the input variable
1 Reference plane
2 Measuredvariable,max.measuringrange
Max. measuring range
5)
15 m (49.21 ft)
Recommended measuring range
6)
up to 10 m (32.81 ft)
blocking distance
7)
Ʋ Modes 1, 2, 4 0 mm (0 in)
Ʋ Mode 3 ≥250mm(9.843in)
Switch-on phase
Start-up time with operating voltage U
B
< 10 s
Output variable
Output
Ʋ Physical layer Digital output signal according to standard EIA-485
Ʋ Busspecications Modbus Application Protocol V1.1b3, Modbus over se-
rial line V1.02
Ʋ Data protocols Modbus RTU, Modbus ASCII, Levelmaster
Max. transmission rate
57.6 Kbit/s
Deviation (according to DIN EN 60770-1)
Process 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 psig)
Installation reference conditions
Ʋ Distance to installations > 200 mm (7.874 in)
Ʋ Reector Flatplatereector
Ʋ Falsereections Biggest false signal, 20 dB smaller than the useful signal
Deviation with liquids ≤2mm(meas.distance>0.25m/0.8202ft)
Non-repeatability
8)
≤2mm
5)
Depending on application and medium
6)
With bulk solids
7)
Depending on the operating conditions
8)
Already included in the meas. deviation