IFM Electronic LR2050 - Dealing with Heavy Soiling; Managing Foam and Turbulence

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7.2.5 In case of heavy soiling
If the medium is highly polluted, there is the risk that a bridge forms between the
rod and the tank wall or structures in the tank�
► Increase minimum distances depending on the pollution intensity�
7.2.6 Heavy foam build-up and turbulence
Heavy foam build-up and turbulence may lead to incorrect measurements�
To avoid this
► Install the sensor in a steady area�
Examples how to create a steady area:
• Use of a coaxial probe (only for clean, low-viscosity media)
• Installation in metal bypass or metal still pipe (fig� 7-6)
• Separation of the installation location by metal sheets / perforated sheets
(without figure)
Fig. 7-6
d
d
A
B
C
D
d: Minimum diameter (→ 7.2.2)
The upper access to the steady area (A, B) must be above the max� level�
The lower access (C, D) or the area with perforated sheet must be below
the min� level� This ensures that neither foam nor turbulence impact the
sensor zone� When perforated sheets or similar are used, soiling (e�g�
solids in the medium) can also be avoided�