VEGA VEGAFLEX 81 4 … 20 mA_HART - four-wire User Manual
Page 74
74
11 Supplement
VEGAFLEX 81 • 4 … 20 mA/HART - four-wire
41825-EN-130314
Ʋ Third HART value (TV)
Measurement certainty, level
Ʋ Fourth HART value (QV)
Electronics temperature
Indication value - DIsplay and adjustment module
2)
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)
3)
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
4)5)
See following diagrams
2)
The indication values can be assigned individually
3)
with interface measurement = 2.0
4)
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
5)
The dead bands can be optimizes by a false signal suppression.