VEGA VEGAPULS 65 (≥ 2.0.0 - ≥ 4.0.0) 4 … 20 mA_HART - four-wire User Manual
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11 Supplement
VEGAPULS 65 • 4 … 20 mA/HART - four-wire
36516-EN-121011
Ʋ Air pressure
860 … 1060 mbar/86 … 106 kPa (12.5 … 15.4 psig)
Installation reference conditions
Ʋ Min. distance to installations
> 200 mm (7.874 in)
Ʋ Reflector
Plane plate reflector
Ʋ False reflections
Largest false echo 20 dB smaller than the useful echo
Deviation with liquids
See following diagrams
1,0 m (3.28 ft)
20 mm (0.788 in)
8 mm (0.315 in)
- 8 mm (- 0.315 in)
- 20 mm (- 0.788 in)
0
1
2
3
Fig. 40: Deviation under reference conditions
1 Reference plane
2 Antenna edge
3 Recommended measuring range
Reproducibility
≤ ±1 mm
Variables influencing measurement accuracy
Specifications apply to the HART signal and the current output
Temperature drift - Digital output
±3 mm/10 K relating to the max. measuring range or
max. 10 mm
Additional deviation through strong, high
frequency electromagnetic fields acc. to
EN 61326
< ±50 mm
Specifications apply also to the current output
Temperature drift - Current output
±0.03 %/10 K relating to the 16 mA span max. ±0.3 %
Deviation on the current output by ana-
logue/digital conversion
< ±15 µA
Deviation on the current output due to
strong, high frequency electromagnetic
fields acc. to EN 61326
< ±150 µA
Characteristics and performance data
Measuring frequency
C-band (6 GHz technology)
Measuring cycle time approx.
350 ms
Step response time
1)
≤ 3 s
1)
Time span after a sudden measuring distance change by max. 0.5 m in liquid applications, max 2 m with bulk
solids applications, until the output signal has taken for the first time 90 % of the final value (IEC 61298-2).