VEGA VEGAPULS 67 (≥ 2.0.0 - ≤ 3.8) Foundation Fieldbus - Manual (Page 54)

Input variable
Measured variable distance between process fitting and product sur-
face
Min. distance from antenna end 50 mm (1.969 in) 6)
Measuring range up to 15 m (49.21 ft)
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 Largest false echo 20 dB smaller than the useful
echo
Characteristics and performance data
Frequency K-band
Interval approx. 1 s
Beam angle -3 dB 7) 10°
Step response or adjustment time 8) > 1 s (dependent on the parameter setting)
Max. level change Adjustable up to 1 m/min. (dependent on the
parameter settings)
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
Measuring accuracy
Resolution, general max. 1 mm (0.039 in)
Deviation 9) see diagrams
6) In products with low dielectric value up to 50 cm (19.69 in).
7) Corresponds to the range with 50 % of the emitted power
8) Time to output the correct level (with max. 10 % deviation) after a sudden
level change.
9) Incl. non-linearity, hysteresis and non-repeatability.
54 VEGAPULS 67 • Foundation Fieldbus
10 Supplement
32941
-EN
-100514