Installation In Stilling Well - Endress+Hauser Micropilot FMR51 Technical Information

Micropilot FMR51, FMR52

Installation in stilling well

Endress+Hauser
1)
Antenna
BO: Horn 50mm/2"
BP: Horn 80mm/3"
1) Feature 070 of the product structure
Please contact Endress+Hauser for applications with higher nozzle.
• For flanges with PTFE cladding: Observe the notes on the mounting of cladded flanges
→  41.
• Usually, the PTFE flange cladding also serves as a seal between the nozzle and the device
flange.
 15 Installation in stilling well
1 Marking for antenna alignment
• For horn antenna: Align the marking towards the slots of the stilling well.
• 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 coating; plastic on request).
• Constant diameter.
• Diameter of stilling well not larger than antenna diameter.
• Diameter difference 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 slots.
• Slots offset 180° (not 90°).
• Slot width or diameter of holes max. 1/10 of pipe diameter, de-burred. Length and number do not
have any influence on the measurement.
• Select horn antenna as big as possible. For intermedaite sizes (e.g. 180 mm (7 in)) select next
larger antenna and adapt it mechanically (for horn antennas)
• At any transition (i.e. when using a ball valve or mending pipe segments), no gap may be left
exceeding 1 mm (0.04 in).
• The stilling well must be smooth on the inside (average roughness R
extruded or parallel welded metal pipe. An extension of the pipe is possible with welded flanges or
pipe sleeves. Flange and pipe have to be properly aligned at the inside.
• Do not weld through the pipe wall. The inside of the stilling well must remain smooth. In case of
unintentional welding through the pipe, the weld seam and any unevenness on the inside need to
be carefully removed and smoothened. Otherwise, strong interference echoes will be generated
and material build-up will be promoted.
• In the case of smaller nominal widths flanges must be welded to the pipe such that they allow for a
correct orientation (marker aligned toward slots).
Maximum nozzle height H
max
500 mm (19.7 in)
500 mm (19.7 in)
1
A0016841
≤ 6.3 μm (248 μin)). Use
z
45