VEGA VEGAFLEX 83 Modbus and Levelmaster protocol PFA insulated - Manual (Page 68)

68
11 Supplement
VEGAFLEX 83 • Modbus and Levelmaster protocol
41838-EN-130314
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) 1)
Ʋ Installation Probe end does not touch the vessel bottom
Sensor parameter adjustment 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 2)3) See following diagrams
0,2 m
(7.874")
0,1 m
(3.937")
0,04 m
(1.575")
1
L
0
-2 mm
(-0.079")
2 mm
(0.079")
15 mm
(0.591")
-15 mm
(-0.591")
Fig. 35: Deviation VEGAFLEX 83 in rod version (coated) in water
1 Dead band - no measurement possible in this area
L Probe length
Deviation - level measurement from 6 m
probe length
0.5 % of the probe length
1) with interface measurement = 2.0
2) 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
3) The dead bands can be optimizes by a false signal suppression.