VEGA VEGAFLEX 86 Foundation Fieldbus Coax probe - Manual (Page 18)

18
4 Mounting
VEGAFLEX 86 • Foundation Fieldbus
44230-EN-130910
Corrective value in the process control system
In the technical data under "Influence of superimposed gas and pres-
sure on accuracy" you can find a table with deviation values in some
typical gases or in steam.
In the control system (DCS) you can correct the measurement results
of the VEGAFLEX 86 with these values.
The prerequisite is constant temperature and pressure in the vessel.
Automatic correction via the reference distance
The VEGAFLEX 86 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.
The reference point must hence not be overfilled. The upper dead
band is hence 450 mm (17.7 in).
2
6
7
3
4
5
1
Fig. 9: Measuring ranges - VEGAFLEX 86 with steam compensation
1 Reference plane
2 Probe length L
3 Measuring range
4 Upper dead band
5 Lower dead band
6 Additional upper dead band by steam compensation
7 Reference measurement distance to steam compensation