VEGA VEGAFLEX 86 4 … 20 mA_HART two-wire Coax probe - Manual (Page 77)

77
11 Supplement
VEGAFLEX 86 • 4 … 20 mA/HART two-wire
42284-EN-130612
Ʋ Displayed value 1 Filling height Level
Ʋ Displayed value 2 Electronics temperature
Resolution, digital < 1 mm (0.039 in)
Accuracy (according to DIN EN 60770-1)
Process reference conditions according to DIN EN 61298-1
Ʋ Temperature +18 … +30 °C (+64 … +86 °F)
Ʋ Relative humidity 45 … 75 %
Ʋ Air pressure +860 … +1060 mbar/+86 … +106 kPa
(+12.5 … +15.4 psig)
Installation reference conditions
Ʋ Min. distance to installations > 500 mm (19.69 in)
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) 4)
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
See following diagrams
Typical deviation - Level measurement 5)6) 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 ")
-5 mm (-0.197 ")
0,15 m (5.906 " )
0,03 m (1.18 " ) 0,1 m
(3.937 ")
1
Fig. 42: Deviation VEGAFLEX 86 in coax version in water
1 Dead band - no measurement possible in this area
L Probe length
4) With interface measurement = 2.0
5) 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
6) The dead bands can be optimizes by a false signal suppression.