Micropilot FMR50
Endress+Hauser 43
Installation in stilling well
A0016841
24 Installation in stilling well
1 Marking to align the antenna
• For the horn antenna: align the marking towards the slot.
• Measurements can be performed through an open full bore ball valve without any problems.
• After mounting, the housing can be turned 350 ° in order to facilitate access to the display and the
terminal compartment.
Recommendations for the stilling well
• Metal (no enamel liner; plastic liner on request).
• Constant diameter.
• Stilling well not larger than antenna diameter.
• Difference in diameter between horn antenna and inner diameter of the stilling well as small as
possible.
• Weld seam as smooth as possible and on the same axis as the slot.
• Slot offset by 180° (not 90°).
• Slot width or diameter of holes max. 1/10 of pipe diameter, deburred. The length and number do
not affect the measurement.
• Select a horn antenna that is as big as possible. For intermediate sizes (e.g. 180 mm (7 in)) select
the next biggest antenna and adapt it mechanically (for horn antennas).
• At transition points, e.g. when a ball valve is used or individual pipe segments are joined, any gaps
that occur should not exceed 1 mm (0.04 in).
• The stilling well must be smooth on the inside (average roughness R
a
≤ 6.3 μm (248 μin)). Use an
extruded or parallel-welded metal pipe as the measuring pipe. The pipe can be extended with
welding neck flanges or pipe sleeves. Flush-align the flange and pipe properly on the inside.
• Do not weld through the pipe wall. The inside of the stilling well must remain smooth. If the pipe
is welded through unintentionally, carefully remove and smoothen any weld seams and
unevenness on the inside, as otherwise this will cause strong interference echoes and encourage
material buildup.
• In the case of small nominal diameters, in particular, ensure that the flanges are welded to the
pipe correctly in line with the orientation (marking aligned towards slot).
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