VEGA VEGAFLEX 81 Foundation Fieldbus Coax probe - Manual (Page 69)

69
11 Supplement
VEGAFLEX 81 • Foundation Fieldbus
44215-EN-130910
Ʋ Channel 9 Count rate
Transmission rate 31.25 Kbit/s
Current value
Ʋ Non-Ex and Ex ia instrument 10 mA, ±0.5 mA
Ʋ Ex-d instruments 16 mA, ±0.5 mA
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) 2)
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 3)4) 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)
2) With interface measurement = 2.0
3) 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
4) The dead bands can be optimizes by a false signal suppression.