VEGA VEGAFLEX 83 4 … 20 mA_HART - four-wire PFA insulated - Manual (Page 68)

68
11 Supplement
VEGAFLEX 83 • 4 … 20 mA/HART - four-wire
41835-EN-130314
Max. output current 22 mA
Starting current ≤ 3.6 mA
Load (4 … 20 mA/HART - active) < 500 Ω
Damping (63 % of the input variable) 0 … 999 s, adjustable
HART output values according to HART 7 (default setting) 1)
Ʋ First HART value (PV) Linearised percentage value, level
Ʋ Second HART value (SV) Distance to the level
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
1) The output values can be assigned individually
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.