Micropilot FMR53, FMR54
44 Endress+Hauser
• 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).
The performance of the FMR54 with a planar antenna is independent of the orientation and
geometry of common stilling wells. Special orientation is not required. However, ensure that
the planar antenna is mounted at a right angle to the stilling well axis.
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