Siemens SITRANS LR120 Modbus Operating Instructions Manual page 20

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Figure 4.3
Inflowing medium
Do not mount the transmitters in or above the filling stream. Make sure that you
detect the medium surface, not the inflowing product.
Figure 4.4
Nozzle
For nozzle mounting, the nozzle should be as short as possible and its end rounded.
This reduces false reflections from the nozzle.
The antenna edge should protrude at least 5 mm (0.2 in) out of the nozzle.
Figure 4.5
If the reflective properties of the medium are good, you can mount SITRANS LR120
Modbus on nozzles longer than the antenna. The nozzle end should be smooth and
burr-free, if possible also rounded.
Note
When mounting on longer nozzles, we recommend carrying out a auto false echo
suppression (see chapter " Parameter adjustment").
You will find recommended values for nozzle heights in the following illustration or
the table. The values come from typical applications. Deviating from the proposed
dimensions, also longer nozzles are possible, however the local conditions must be
taken into account.
SITRANS LR120 Modbus
Operating Instructions, 10/2022, 62709-76-01, A5E49829030
Reference point
Reference point
Mounting of the radar transmitter with inflowing medium
Recommended nozzle mounting of SITRANS LR120 Modbus
Installing/mounting
4.3 Mounting instructions
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