Vega VEGAPULS 63 - 11 Supplement: Accuracy and Deviations; Accuracy, Installation Conditions & Deviations

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11 Supplement
VEGAPULS 63 • Modbus and Levelmaster protocol
41364-EN-170711
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
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 internal 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 See following diagrams
0,5 m (1.6 ft)
10 mm (0.394 in)
- 10 mm (- 0.394 in)
0
2 mm (0.079 in)
- 2 mm (- 0.079 in)
1 2
3
Fig. 48: Deviation under reference conditions
1 Reference plane
2 Antenna edge
3 Recommended measuring range
Repeatability ≤±1mm
Variablesinuencingmeasurementaccuracy
Temperature drift - Digital output ±3mm/10K,max.10mm
Additional deviation through electromag-
netic interference acc. to EN 61326
<±50mm
Inuenceofthesuperimposedgasandpressureonmeasurementaccuracy
The propagation speed of the radar impulses in gas or vapour above the medium is reduced by
highpressure.Thiseectdependsonthetypeof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specied
values refer to the distance. Positive values mean that the measured distance is too large, negative
values that the measured distance is too small.