56
10 Supplement
VEGAPULS 66 • 4 … 20 mA/HART - two-wire
28438-EN-170927
HART output values
Ʋ 1. HART value (Primary Value)
Distance to the level
Ʋ 2. HART value (Secondary Value)
Distance to the level - scaled (for example hl, %)
Resolution, digital
> 1 mm (0.039 in)
Input variable
Measured variable
distance between process fitting and product surface
Min. distance from antenna end
100 mm (4 in)
Measuring range
up to 35 m (114.83 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
C-band (6 GHz technology)
Meas. interval approx.
1 s
Beam angle -3 dB
9)
dependent on the antenna system
Ʋ without horn antenna
38°
Ʋ ø 75 mm (2.953 in)
38°
Ʋ ø 96 mm (3.78 in)
30°
Ʋ ø 146 mm (5.748 in)
20°
Ʋ ø 196 mm (7.717 in)
17°
Ʋ ø 242 mm (9.528 in)
14°
Step response or adjustment time
10)
> 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
Ʋ Pulse peak power approx.
0.1 mW
Ʋ Pulse duration
< 2 ns
Ʋ SAR value
11)
0.471 mW/kg
Measuring accuracy
Resolution, general
max. 1 mm (0.039 in)
9)
Corresponds to the range with 50 % of the emitted power
10)
Time to output the correct level (with max. 10 % deviation) after a sudden level change.
11)
At the aperture of a horn antenna with ø 150 mm
