Installation Micropilot FMR56, FMR57 FOUNDATION Fieldbus
22 Endress+Hauser
FMR57 - Parabolic antenna
Antenna size 200 mm (8 in) 250 mm (10 in)
Beam angle α 4° 3,5°
Measuring distance (D) Beamwidth diameter W
5 m (16 ft) 0.35 m (1.1 ft) 0.30 m (1 ft)
10 m (33 ft) 0.70 m (2.3 ft) 0.61 m (2 ft)
15 m (49 ft) 1.05 m (3.4 ft) 0.92 m (3 ft)
20 m (66 ft) 1.40 m (4.6 ft) 1.22 m (4 ft)
30 m (98 ft) 2.10 m (6.9 ft) 1.83 m (6 ft)
40 m (131 ft) 2.79 m (9.2 ft) 2.44 m (8 ft)
50 m (164 ft) 3.50 m (11 ft) 3.06 m (10 ft)
60 m (197 ft) 4.19 m (14 ft) 3.70 m (12 ft)
70 m (230 ft) 4.90 m (16 ft) 4.28 m (14 ft)
6.2 Measuring conditions
• The measuring range begins, where the beam hits the bottom. Particularly with conical
outlets the level cannot be detected below this point. The maximum measuring range can
be increased in such applications by using an alignment device .
• In case of media with a low dielectric constant (ε
r
= 1.5 to 2.5)
1)
, the bottom can be visible
through the medium at low levels. In order to guarantee the required accuracy in these
cases, it is recommended to position the zero-point at a distance C above the bottom (see
figure).
• In principle it is possible to measure up to the tip of the antenna with Micropilot. However,
due to considerations regarding abrasion and build-up and depending on the orientation of
the product surface (angle of repose), the end of the measuring range should be at a
distance of A (see figure) from the tip of the antenna. If required, and if some conditions
(high DC value, flat angle of repose) are met, shorter distances can be achieved.
1) Dielectric constants of important media commonly used in various industries are summarized in the DC manual
(CP01076F) and in the Endress+Hauser "DC Values App" (available for Android and iOS).
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