50
10 Supplement
VEGAPULS 61 • Profibus PA
28444-EN-141215
Input variable
Measured variable
distance between process fitting and product surface
Min. distance from antenna end
50 mm (1.969 in)
6)
Recommended measuring range, encap-
sulated 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 (according to DIN EN 60770-1)
Reference conditions according to DIN EN 61298-1
Ʋ Temperature
+18 … +30 °C (+64 … +86 °F)
Ʋ Relative humidity
45 … 75 %
Ʋ Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Other reference conditions
Ʋ Reflector
ideal reflector, e.g. metal plate 2 x 2 m
Ʋ False reflections
Biggest false signal, 20 dB smaller than the useful signal
Characteristics and performance data
Measuring frequency
K-band (26 GHz technology)
Meas. interval approx.
1 s
Beam angle -3 dB
7)
Ʋ Encapsulated antenna system
22°
Ʋ 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
Ʋ Pulse peak power
< 2 mW
Ʋ Pulse duration
< 2 ns
Ʋ Average power
< 5 µW
Ʋ Average power with 1 m distance
< 200 nW/cm
2
Max. emitted HF power of the antenna system - Version with increased sensitivity
Ʋ Pulse peak power
< 10 mW
Ʋ Pulse duration
< 2 ns
Ʋ Average power
< 25 µW
Ʋ Average power with 1 m distance
< 1 µW/cm
2
Measuring accuracy
Resolution, general
< 1 mm (0.039 in)
Deviation
9)
see diagrams
6)
For products with low dielectric figure 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.