Siemens SITRANS LG270 Operating Instructions Manual page 22

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In the control system (DCS) you can correct the measurement results
of the SITRANS LG270 with these values.
The prerequisite is constant temperature and pressure in the vessel.
Automatic correction via the reference distance
The SITRANS LG270 can be equipped optionally with a running time
correction via reference distance. The probe can carry out an auto-
matic running time correction with it.
Probes with reference distance can only be used when mounting in
standpipes or bypass tubes.
The min. length of the probe is 1000 mm (39.4 in).
The reference distance must not be overfilled. The upper dead band
is hence 450 mm (17.7 in).
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Fig. 13: Measuring ranges - SITRANS LG270 with steam compensation
1 Reference plane
2 Probe length L
3 Measuring range
4 Upper dead zone with steam compensation = 450 mm (17.7 in)
5 Lower dead band
6 Reference measurement distance to steam compensation
SITRANS LG270 - Operating Instructions
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PBD-51041066