Micropilot FMR60
28 V. 4, Rev. 2, 19-03-2018 Endress+Hauser
Measuring through plastic tank ceilings or dielectric windows
• Dielectric constant of the medium: ε
r
≥ 10
• The distance from the lower edge of the antenna to the tank ceiling or window should be about
100 mm (4 in).
• If possible, avoid mounting locations where condensation or build-up might occur.
• In case of outdoor mounting, the space between antenna and vessel has to be protected from the
elements.
• Do not mount any potential reflectors (e.g. pipes) outside the tank in the signal beam.
Suitable thickness of the tank ceiling or dielectric window
Material PE PTFE PP Perspex
DK (= ε
r
) 2.3 2.1 2.3 3.1
Optimum thickness 1.25 mm
(0.049 in)
1)
1.3 mm (0.051)
1)
1.25 mm
(0.049 in)
1)
1.07 mm
(0.042 in)
1)
1) or an integer multiple of this value; however, take into account that the microwave transparency is
significantly reduced when increasing the thickness of the window.
Installation: Drip-off
antenna PTFE 50 mm / 2"
Aligning the antenna axis
Align the antenna vertically to the product surface.
Attention:
The maximum reach of the antenna can be reduced if it is not installed perpendicular to the
product.
Radial alignment of the antenna
Based on the directional characteristic, radial alignment of the antenna is not necessary.
Information concerning nozzles
The maximum nozzle length H
max
depends on the nozzle diameter D:
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