Micropilot FMR51, FMR52 PROFIBUS PA Installation
Endress+Hauser 19
• In case of media with a low dielectric constant (ε
r
= 1.5 to 4)
2)
the tank bottom can be
visible through the medium at low levels (low height C). Reduced accuracy has to be
expected in this range. If this is not acceptable, we recommend positioning the zero point at
a distance C (see figure) above the tank bottom in these applications.
• In principle it is possible to measure up to the tip of the antenna with FMR51, FMR53 and
FMR54. However, due to considerations regarding corrosion and build-up, the end of the
measuring range should not be chosen any closer than A (see figure) to the tip of the
antenna.
• When using FMR54 with planar antenna, especially for media with low dielectric constants,
the end of the measuring range should not be closer than A: 1 m (3.28 ft) to the flange.
• The smallest possible measuring range B depends on the antenna version (see figure).
• The tank height should be at least H (see table).
A0018872
Device A [mm (in)] B [m (ft)] C [mm (in)] H [m (ft)]
FMR51 50(1.97)
> 0.2 (0.7) 50 to 250 (1.97 to 9.84) > 0.3 (1.0)
FMR52 200(7.87)
2) 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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