VEGA VEGAPULS 61 (≥ 2.0.0 - ≤ 3.8) Foundation Fieldbus - Manual (Page 55)

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Channel 1 Primary value
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Channel 2 Secondary value 1
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Channel 3 Secondary value 2
Transmission rate 31.25 Kbit/s
Current value 10 mA, ±0.5 mA
Resolution, digital > 1 mm (0.039 in)
Input variable
Measured variable distance between process fitting and product sur-
face
Min. distance from antenna end 50 mm (1.969 in) 6)
Recommended measuring range, encapsu-
lated antenna system up to 10 m (32.81 ft)
Recommended measuring range plastic horn
antenna up to 20 m (65.62 ft)
Reference conditions to measuring accuracy (similar to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
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Temperature +18 … +30 °C (+64 … +86 °F)
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Relative humidity 45 … 75 %
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Air pressure 860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Other reference conditions
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Reflector ideal reflector, e.g. metal plate 2 x 2 m
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False reflections Largest false echo 20 dB smaller than the useful
echo
Characteristics and performance data
Frequency K-band (26 GHz technology)
Meas. interval approx. 1 s
Beam angle -3 dB 7)
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Encapsulated antenna system 22°
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Plastic horn antenna 10°
Step response or adjustment time 8) < 1 s (dependent on the parameter settings)
Max. level change Adjustable up to 1 m/min. (dependent on the
parameter settings)
Max. emitted HF power of the antenna system
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Pulse peak power < 2 mW
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.
VEGAPULS 61 • Foundation Fieldbus 55
10 Supplement
28449
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EN
-100426