45
13 Supplement
VEGAPULS C 11 • Two-wire 4 … 20 mA
58340-EN-200806
Ʋ Reflector
Flat plate reflector
Ʋ False reflections
Biggest false signal, 20 dB smaller than the useful signal
Deviation with liquids
≤ 5 mm (meas. distance > 0.25 m/0.8202 ft)
Non-repeatability
8)
≤ 5 mm
Deviation with bulk solids
The values depend to a great extent on the application.
Binding specifications are thus not possible.
0,25 m (0.8202 ft)
10 mm (0.3937 in)
- 10 mm (- 0.3937 in)
5 mm (0.1969 in)
- 5 mm (- 0.1969 in)
0
1
2
Fig. 24: Deviation under reference conditions
9)
1 Antenna edge, reference plane
2 Recommended measuring range
Variables influencing measurement accuracy
Temperature drift - Current output
< 0.03 %/10 K relating to the 16 mA span or ≤ 0.3 %
Deviation in the current output due to
digital/analogue conversion
< 15 µA
Additional deviation through electromagnetic interference
Ʋ According to NAMUR NE 21
< 80 µA
Ʋ According to EN 61326-1
None
Ʋ According to IACS E10 (shipbuilding)/
IEC 60945
< 250 µA
Characteristics and performance data
Measuring frequency
W-band (80 GHz technology)
Measuring cycle time
10)
≤ 250 ms
Step response time
11)
≤ 3 s
Beam angle
12)
8°
8)
Already included in the meas. deviation.
9)
In case of deviations from reference conditions, the offset due to installation can be up to +/- 4 mm. This offset
can be compensated by the adjustment.
10)
With operating voltage U
B
≥ 24 V DC
11)
Time span after a sudden distance change from 1 m to 5 m until the output signal reaches 90 % of the final
value for the first time (IEC 61298-2). Valid with operating voltage U
B
≥ 24 V DC.
12)
Outside the specified beam angle, the energy level of the radar signal is 50% (-3 dB) less.
