VEGA VEGAPULS 61 (≥ 2.0.0 - ≥ 4.0.0) Foundation Fieldbus - Manual (Page 64)

64
11 Supplement
VEGAPULS 61 • Foundation Fieldbus
36502-EN-121011
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. 56: Deviation under reference conditions - plastic horn antenna
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
Characteristics and performance data
Measuring frequency
K-band (26 GHz technology)
Measuring cycle time
Ʋ Standard electronics approx. 450 ms
Ʋ Electronics with increased sensitivity
approx.
700 ms
Step response time 1) ≤ 3 s
Tracking speed of the measuring window
max.
1 m/min
Beam angle 2)
Ʋ Encapsulated antenna system 22°
Ʋ Plastic horn antenna 10°
Emitted HF power (depending on the parameter adjustment) 3)
Ʋ Average spectral transmission power
density
-14 dBm/MHz EIRP
Ʋ Max. spectral transmission power
density
+43 dBm/50 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