VEGA VEGAPULS WL 61 Profibus PA - Manual (Page 38)

38
9 Supplement
VEGAPULS WL 61 • Profibus PA
38062-EN-121011
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)
- 10 mm (- 0.394 in)
2 mm (0.079 in)
- 2 mm (- 0.079 in)
0
1 2 3
Fig. 41: Deviation under reference conditions
1 Reference plane
2 Antenna edge
3 Recommended measuring range
Reproducibility ≤ ±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 strong, high
frequency electromagnetic fields acc. to
EN 61326
< ±50 mm
Characteristics and performance data
Measuring frequency
K-band (26 GHz technology)
Measuring cycle time approx. 450 ms
Step response time 1) ≤ 3 s
Tracking speed of the measuring window
max.
1 m/min
Beam angle 2) 10°
Emitted HF power 3)
Ʋ Average spectral transmission power
density
-34 dBm/MHz EIRP
Ʋ Max. spectral transmission power
density
+6 dBm/50 MHz EIRP
Ʋ Max. power density in a distance of
1 m
< 1 µW/cm²
1) Time span after a sudden distance change of max. 0.5 m until the output signal reaches 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