Siemens SITRANS LG250 Operating Instructions Manual page 77

Ʋ Vessel
Ʋ Medium
Ʋ Installation
Sensor parameter adjustment
Typical deviation - Interface measure-
ment
Typical deviation - Total level interface
measurement
Typical deviation - Level measurement
15 mm
(0.591 )
"
2 mm
(0.079
")
0
-2 mm
(-0.079
")
1
-10 mm
(-0.394
")
0,08 m
(3.15 )
"
Fig. 39: Deviation SITRANS LG250 in rod version in water
1 Dead band - no measurement possible in this area
L Probe length
With interface measurement = 2.0
4)
Depending on the installation conditions, deviations can occur which can be rectified by adapting the adjust-
5)
ment or changing the measured value offset in the DTM service mode
The dead bands can be optimized via a false signal suppression.
6)
PBD-51041388
metallic, ø 1 m (3.281 ft), centric installation, process
fitting flush with the vessel ceiling
Water/Oil (dielectric constant ~2.0)
Probe end does not touch the vessel bottom
No gating out of false signals carried out
± 5 mm (0.197 in)
See following diagrams
See following diagrams
5)6)
0,3 m
(11.811 )
"
SITRANS LG250 - Operating Instructions
L
4)
0,02 m
(0.787
")
77