Vega VEGAPULS 65, Руководство по эксплуатации

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11 Supplement
VEGAPULS 65 • Foundation Fieldbus
36518-EN-140209
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 Biggest false signal, 20 dB smaller than the useful signal
Deviation with liquids See following diagrams
1,0 m (3.28 ft)
20 mm (0.788 in)
8 mm (0.315 in)
- 8 mm (- 0.315 in)
- 20 mm (- 0.788 in)
0
1 2 3
Fig. 31: Deviation under reference conditions
1 Reference plane
2 Antenna edge
3 Recommended measuring range
Repeatability ≤ ±1 mm
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 electromag -
netic interference acc. to EN 61326
< ±50 mm
Characteristics and performance data
Measuring frequency C-band (6 GHz technology)
Measuring cycle time approx. 350 ms
Step response time
1)
≤ 3 s
Beam angle
2)
24°
Emitted HF power (depending on the parameter adjustment)
3)
Ʋ Average spectral transmission power
density
-31 dBm/MHz EIRP
1)
Time span after a sudden measuring distance change by max. 0.5 m in liquid applications, max 2 m with bulk
solids applications, until the output signal has taken for the first time 90 % of the final value (IEC 61298-2).
2)
Outside the specified beam angle, the energy of the radar signal has a level which is reduced by 50 % (-3 dB)
3)
EIRP: Equivalent Isotropic Radiated Power