Siemens SITRANS LG270 Operating Instructions Manual page 65

10 mm (0.394 ")
6 mm (0.236
")
0
-6 mm (-0.236
")
1
-10 mm (-0.394
")
0,1 m (3.937
Fig. 30: Deviation SITRANS LG270 in coax version in oil (measurement length up to 6 m/19.69 ft)
1 Dead zone (no measurement possible in this area)
L Probe length
Non-repeatability
Variables influencing measurement accuracy
Specifications for the digital measured value
Temperature drift - Digital output
Additional deviation through electromag-
netic interference acc. to EN 61326
Specifications apply also to the current output
Temperature drift - Current output
Deviation in the current output due to digital/analogue conversion
Ʋ Non-Ex and Ex-ia version
Ʋ Ex-d-ia version
Additional deviation through electromag-
netic interference acc. to EN 61326
Influence of the superimposed gas and pressure on measurement accuracy
The propagation speed of the radar impulses in gas or vapour above the medium is reduced by
high pressure. This effect depends on the superimposed gas or vapours.
The following table shows the resulting deviation for some typical gases and vapours. The specified
values refer to the distance. Positive values mean that the measured distance is too large, negative
values that the measured distance is too small.
Also for the additional current output (optional).
7)
PBD-51041507
) 0,25 m (9.842 )
" "
≤ ±1 mm
±3 mm/10 K relating to the max. measuring range or
max. 10 mm (0.394 in)
< ±10 mm (< ±0.394 in)
±0.03 %/10 K relating to the 16 mA span or max. ±0.3 %
< ±15 µA
< ±40 µA
< ±150 µA
SITRANS LG270 - Operating Instructions
L
0,1 m
(3.937
7)
1
") 0,05 m
(1.968
")
65