VEGA VEGAPULS 65 (≥ 2.0.0 - ≥ 4.0.0) HART and accumulator pack - Manual (Page 54)

54
11 Supplement
VEGAPULS 65 • HART and accumulator pack
40932-EN-121011
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. 38: 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
Tracking speed of the measuring window
max.
1 m/min
Beam angle 2) 24°
Emitted HF power (depending on the parameter adjustment) 3)
Ʋ Average spectral transmission power
density
-31 dBm/MHz EIRP
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).
2) Outside the specified beam angle, the energy of the radar signal has a level which is reduced by 50 % (-3 dB)
3) EIRP: Equivalent Isotropic Radiated Power