VEGA VEGAPULS 62 (≥ 2.0.0 - ≥ 4.0.0) Modbus and Levelmaster protocol User Manual
Page 62
62
10 Supplement
VEGAPULS 62 • Modbus and Levelmaster protocol
41362-EN-121011
Ʋ Protocols
Modbus RTU, Modbus ASCII, Levelmaster
Max. transmission rate
9.6 Kbit/s
Accuracy (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 Min. distance to installations
> 200 mm (7.874 in)
Ʋ Reflector
Plane plate reflector
Ʋ False reflections
Largest false echo 20 dB smaller than the useful echo
Deviation with liquids
See following diagrams
0,5 m (1.6 ft)
10 mm (0.394 in)
2 mm (0.079 in)
- 2 mm (- 0.079 in)
- 10 mm (- 0.394 in)
0
1 2
3
Fig. 53: Deviation under reference conditions
1 Reference plane
2 Antenna edge
3 Recommended measuring range
Reproducibility
≤ ±1 mm
Deviation with bulk solids
The values depend to a great extent on the application.
Binding specifications are thus not possible.
Variables influencing measurement accuracy
Temperature drift - Digital output
±3 mm/10 K relating to the max. measuring range or
max. 10 mm
Additional deviation through strong, high
frequency electromagnetic fields acc. to
EN 61326
< ±50 mm
Influence of the superimposed gas and pressure to the accuracy
The propagation speed of the radar impulses in gas or vapour above the medium is reduced by
high pressure. This effect depends on the superimposed gas or vapour and is especially large at
low temperatures.
The following table shows the resulting deviation for some typical gases and vapours. The specified
values refer to the distance. Positive values mean that the measured distance is too large, negative
values that the measured distance is too small.