Vega VEGAPULS 67 Operating Instructions Manual page 72

11 Supplement
10 mm (0.394 in)
2 mm (0.079 in)
0
- 2 mm (- 0.079 in)
- 10 mm (- 0.394 in)
1 2
Fig. 47: Deviation under reference conditions
1 Reference plane
2 Antenna edge
3 Recommended measuring range
Repeatability
Deviation with bulk solids
Deviation under EMC influence
Variables influencing measurement accuracy
Specifications apply to the digital measured value
Temperature drift - Digital output
Additional deviation through electromag-
netic interference acc. to EN 61326
Specifications apply also to the current output
Temperature drift - Current output
Deviation on the current output through
analogue/digital conversion
Deviation in the current output due to
strong, high-frequency electromagnetic
fields acc. to EN 61326
Characteristics and performance data
Measuring frequency
Measuring cycle time approx.
Step response time
2)
Beam angle
3)
Emitted HF power (depending on the parameter adjustment)
Ʋ Average spectral transmission power
density
Time span after a sudden measuring distance change by max. 0.5 m in liquid applications, max 2 m with bulk
2)
solids applications, until the output signal has taken for the first time 90 % of the final value (IEC 61298-2).
Outside the specified beam angle, the energy level of the radar signal is 50% (-3 dB) less.
3)
EIRP: Equivalent Isotropic Radiated Power.
4)
72
1,0 m
(3.280 ft)
≤ ±1 mm
The values depend to a great extent on the application.
Binding specifications are thus not possible.
≤ ±30 mm
±3 mm/10 K, max. 10 mm
< ±50 mm
±0.03 %/10 K relating to the 16 mA span max. ±0.3 %
< ±15 µA
< ±150 µA
K-band (26 GHz technology)
700 ms
≤ 3 s
10°
-14 dBm/MHz EIRP
4)
VEGAPULS 67 • 4 ... 20 mA/HART - four-wire
3