VEGA VEGAPULS 67 (≥ 2.0.0 - ≥ 4.0.0) Profibus PA User Manual
Page 63
63
11 Supplement
VEGAPULS 67 • Profibus PA
36533-EN-121011
Ʋ Min. distance to installations
> 200 mm (7.874 in)
Ʋ Reflector
Plane plate reflector
Ʋ False reflections
Largest false echo 20 dB smaller than the useful echo
Deviation with liquids
See following diagrams
10 mm (0.394 in)
- 10 mm (- 0.394 in)
2 mm (0.079 in)
- 2 mm (- 0.079 in)
0
1 2
3
1,0 m
(3.280 ft)
Fig. 53: Deviation under reference conditions
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.
Deviation under EMC influence
≤ ±30 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.
700 ms
Step response time
1)
≤ 3 s
Tracking speed of the measuring window
max.
1 m/min
Beam angle
2)
10°
Emitted HF power (depending on the parameter adjustment)
3)
Ʋ Average spectral transmission power
density
-14 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