Micropilot FMR53, FMR54 HART Installation
Endress+Hauser 27
6.4.3 Planar antenna (FMR54)
The planar antenna is only suited for stilling well applications . It can not be used for free
space applications.
6.5 Installation in stilling well
A0016841
7 Installation in stilling well
1 Marking for antenna alignment
• For horn antenna: Align the marking towards the slots of the stilling well.
• No alignment is required for planar antennas.
• 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 → 29.
6.5.1 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).
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