KROHNE BM 70 A_P EN - Manual (Page 19)

Installation and operating instructions BM 70 A/P Page: 19 11/00
B) Stilling well or Wave-Guide
A stilling well or Wave-Guide may be mounted in any position on the tank.
(For design layout: see also Section 6.1.4; for block distance: see Section 3.3).
Stilling well application In a side vessel BM 70 A Wave-Guide
6.1.3 Mounting on tank fitting
A) Horn antenna
Should be mounted on the tank fitting as close to the horizontal as possible (deviation < ± 2°).
Exception: if product surface is not horizontal, (e.g. particulate materials) the flange can be aligned
roughly parallel to it.
The antenna should project out of the fitting:
Tank nozzle
D
L
A stilling well or Wave-Guide
is positively recommended for
horizontal cylindrical tanks
(to avoid multiple reflections):
Antenna Diameter D Length l*
Type 4 200 mm (8”) 335 mm (13.2”)
Type 3 140 mm (5.5”) 223 mm (8.8”)
* Hastelloy: + 30 mm (1.2”)
(subject to change without notice)