47
14 Supplement
VEGAPULS C 23 • Modbus and Levelmaster protocol
58349-EN-200806
Ʋ False reflections
Biggest false signal, 20 dB smaller than the useful signal
Deviation with liquids
≤ 2 mm (meas. distance > 0.25 m/0.8202 ft)
Non-repeatability
7)
≤ 2 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)
2 mm (0.0787 in)
- 2 mm (- 0.0787 in)
0
1
2
Fig. 27: Deviation under reference conditions
8)
1 Antenna edge, reference plane
2 Recommended measuring range
Variables influencing measurement accuracy
9)
Specifications apply to the digital measured value
Temperature drift - Digital output
< 3 mm/10 K, max. 5 mm
Specifications apply also to the current output
Temperature drift - Current output
< 0.03 %/10 K or max. 0.3 % relating to the 16.7 mA
span
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
≤ 250 ms
Step response time
10)
≤ 3 s
7)
Already included in the meas. deviation
8)
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.
9)
Determination of the temperature drift acc. to the limit point method
10)
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.
