Users Manual Part 2

Electronic level sensor LW2720
31
A
C
E
m
0
mV
0.5
1.0
1.5
2.0
2.5
3.0
0 150 300 450 600 750 900
D
B
Fig.16: Upper blind zone/ detection threshold
A: upper blind zone
B: disturbing echo of object
C: 100% (20 mA) of the analogue range
D: detection threshold
E: medium surface echo
Nozzles or other objects close to the antenna may cause disturbing reflections. Such reflections
can be blocked out by configuring an upper blind zone (A).
Note:
In the upper blind zone, the level is not or not reliably detected.
u Make sure that the maximum level is limited, e.g. by using an overflow or by throttling the inlet.
8.4 System commands
Start simulation Starts the simulation mode. The level set under the parameter [S.Lvl] is
simulated.
Stop simulation Stops the simulation.
Reset to factory settings Restores the factory settings (all parameters)
For further information, please refer to the IODD description www.ifm.com or to the context-specific
parameter descriptions of the used parameter setting software.
8.5 Example parameter setting
• The unit is to monitor the level in an 8 m high tank.
• The unit is mounted in a nozzle (nozzle height: 150mm).
• No tank offset is to be used.
• The medium is aqueous (beer or milk).
• The unit to be used is [m].
• Output OUT2 is to be configured as an analogue output.
u Reset the unit to factory settings:
Execute the system command [Factory reset].
w This serves to avoid incorrect settings and establish a defined start situation.
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