35
9 Supplement
VEGAPULS WL 61 • Profibus PA
38062-EN-140801
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
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. 36: 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
K-band (26 GHz technology)
Measuring cycle time approx.
450 ms
Step response time
1)
≤ 3 s
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
