VEGA VEGAPULS 68 (≥ 2.0.0 - ≤ 3.8) Profibus PA - Manual (Page 55)

Current value 10 mA, ±0.5 mA
Damping (63 % of the input variable) 0 … 999 s, adjustable
Input variable
Measured value distance between process fitting and product sur-
face
Max. measuring range 70 m (229.7 ft)
Min. distance from antenna end 400 mm (15.75 in)
Reference conditions to measuring accuracy (similar to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
-
Temperature + 18 … +30 °C (+64 … +86 °F)
-
Relative humidity 45 … 75 %
-
Air pressure 860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Other reference conditions
-
Reflector ideal reflector, e.g. metal plate 2 x 2 m
-
False reflections Biggest false echo, 20 dB smaller than the useful
echo
Characteristics and performance data
Frequency K-band
Interval approx. 1 s
Beam angle -3 dB with horn antenna, depending on antenna diameter
-
ø 40 mm (1.575 in) 22°
-
ø 48 mm (1.89 in) 18°
-
ø 75 mm (2.953 in) 10°
-
ø 95 mm (3.74 in) 8°
Beam angle -3 dB with parabolic antenna 4°
Step response or adjustment time 6) > 1 s (dependent on the parameter setting)
Max. level change Adjustable up to 1 m/min. (dependent on the
parameter adjustment)
Max. emitted HF power of the antenna system
-
Pulse peak power < 10 mW
-
Pulse duration < 2 ns
-
Average power < 25 µW
-
Average power with 1 m distance < 1 µW/cm 2
6) Time to output the correct level (with max. 10 % deviation) after a sudden
level change.
VEGAPULS 68 • Profibus PA 55
10 Supplement
29263
-EN
-090305