11
4 Mounting
OPTISOUND 3020 C • Two-wire 4 … 20 mA/HART
30507-EN-190318
Make sure that a minimum distance from the reference plane - the
so-called dead zone, in which measurement is not possible - is
maintained. The exact value of the dead zone is stated in chapter
"
Technical data
".
1
2
Fig. 3: Minimum distance to the max. level
1 Dead zone
2 Reference plane
Information:
If the medium reaches the transducer, buildup can form on it and
cause faulty measurements later on.
1
3
2
100%
0%
Fig. 4: Measuring range (operating range) and max. measuring distance
1 full
2 empty (max. measuring distance)
3 Measuring range
Gauge pressure in the vessel does not influence OPTISOUND 3020
C. Low pressure or vacuum does, however, damp the ultrasonic
pulses. This influences the measuring result, particularly if the level
is very low. With pressures under -0.2 bar (-20 kPa) you should use a
different measuring principle, e.g. radar or guided radar (TDR).
Pressure/Vacuum
