KROHNE BM 702 A EN - Manual (Page 19)

INSTALLATION
3
19
BM 702 A
www.krohne.com 09/2009 - 4000643301 - MA BM 702 A R01 en
3.6.2 Installation in stilling wells
Use a stilling well if:
• There is highly conductive foam in the tank.
• The liquid is very turbulent or agitated.
• There are too many other obstacles near to the area where you want to install the device.
• There is an applications with a tank with a floating roof.
Figure 3-6: Installation recommendations for stilling wells
1 Basic requirements for a stilling well
2 Recommendations for tanks that have no foam
3 Air circulation hole (max. Ø10 mm / 0.4")
4 Maximum level of the liquid
5 Liquid circulation holes (max. Ø10 mm / 0.4")
6 Distance between holes ≥ 50 mm / 2"
7 Clearance between the antenna and the wall of the stilling well ≤ 5 mm / 0.2"
8 Sudden change in well diameter ≤ 1 mm / 0.04"
CAUTION!
Installation requirements
• The stilling well must be electrically conductive.
• The inside diameter of the stilling well must not be more than 10 mm / 0.4" over the diameter
of the antenna.
• The stilling well must be straight.
• The stilling well must have a surface roughness of ±≤0.1 mm / 0.004" or better.
• There must be no sudden changes in internal diameter greater than 1 mm / 0.04".
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