VEGA VEGAFLEX 81 4 … 20 mA_HART two-wire Coax probe User Manual
Page 76
76
11 Supplement
VEGAFLEX 81 • 4 … 20 mA/HART two-wire
42279-EN-130612
Ʋ Vessel
metallic, ø 1 m (3.281 ft), centric installation, process
fitting flush with the vessel ceiling
Ʋ Medium
Water/Oil (dielectric constant ~2.0)
5)
Ʋ Installation
Probe end does not touch the vessel bottom
Sensor parameter adjustment
No gating out of false signals carried out
Typical deviation - Interface measure-
ment
± 5 mm (0.197 in)
Typical deviation - Total level interface
measurement
± 5 mm (0.197 in)
Typical deviation - Level measurement
6)7)
See following diagrams
Max. deviation - Version with reference
distance
± 10 mm (0.39 in)
Deviating upper dead band - Version with
reference distance
450 mm (17.7 in)
L
0
-2 mm (-0.079
")
2 mm (0.079
")
-10 mm (0.394
")
5 mm (0.197
")
0,15 m (5.906
"
)
0,03 m (1.181
"
)
0,05 m
(1.969
")
1
Fig. 41: Deviation VEGAFLEX 81 in coax version in water
1 Dead band - no measurement possible in this area
L Probe length
5)
With interface measurement = 2.0
6)
Depending on the installation conditions, there can be deviations which can be rectified with an adaptation of
the adjustment or a change of the measured value offset in the DTM service mode
7)
The dead bands can be optimizes by a false signal suppression.