Operating Instructions

43
14 Supplement
VEGAPULS C 21 • Two-wire 4 … 20 mA/HART
58341-EN-191014
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. 28: Deviation under reference conditions
1 Antennaedge,referenceplane
2 Recommended measuring range
Variablesinuencingmeasurementaccuracy
Specicationsapplytothedigitalmeasuredvalue
Temperature drift - Digital output < 3 mm/10 K, max. 10 mm
Specications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
6)
≤250ms
Step response time
7)
≤3s
Beam angle
8)
8°
Emitted HF power (depending on the parameter setting)
9)
Ʋ Average spectral transmission power
density
-3 dBm/MHz EIRP
Ʋ Max. spectral transmission power
density
+34 dBm/50 MHz EIRP
Ʋ Max. power density at a distance of
1 m
< 3 µW/cm²
6)
With operating voltage U
B
≥24VDC
7)
 Timespanafterasuddendistancechangefrom1mto5muntiltheoutputsignalreaches90%ofthenal
valueforthersttime(IEC61298-2).ValidwithoperatingvoltageU
B
≥24VDC.
8)
 Outsidethespeciedbeamangle,theenergyleveloftheradarsignalis50%(-3dB)less.
9)
EIRP: Equivalent Isotropic Radiated Power