VEGA VEGAFLEX 86 Modbus and Levelmaster protocol Coax probe - Manual (Page 66)

66
11 Supplement
VEGAFLEX 86 • Modbus and Levelmaster protocol
42288-EN-130314
Output variable
Output
Ʋ Physical layer Digital output signal according to standard EIA-485
Ʋ Bus specifications Modbus Application Protocol V1.1b, Modbus over serial
line V1.02
Ʋ Protocols Modbus RTU, Modbus ASCII, Levelmaster
Max. transmission rate 9.6 Kbit/s
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
Max. deviation - Version with reference
distance
± 10 mm (0.39 in)
Deviating upper dead band - Version with
reference distance
450 mm (17.7 in)
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.