Micropilot FMR60B PROFINET with Ethernet-APL
6 Endress+Hauser
D = (c ∆t) / 2
where c is the speed of propagation of the wave.
In summary, D can be calculated from the measured difference frequency Δf. D is then used to
determine the content of the tank or silo.
Input
Measured variable
The measured variable is the distance between the reference point and the product surface. The level
is calculated based on "E", the empty distance entered.
Measuring range
The measuring range starts at the point where the beam hits the tank floor. Levels below this point
cannot be measured, particularly in the case of spherical bases or conical outlets.
Maximum measuring range
The maximum measuring range depends on the antenna size and design.
Antenna Maximum measuring range
Encapsulated, PVDF, 40 mm (1.5 in) 40 m (131 ft)
Drip-off, PTFE, 50 mm (2 in) 50 m (164 ft)
Integrated, PEEK, 20 mm (0.75 in) 10 m (32.8 ft)
Integrated, PEEK, 40 mm (1.5 in) 22 m (72 ft)
Usable measuring range
The usable measuring range depends on the antenna size, the medium's reflective properties, the
installation position and any possible interference reflections.
In principle, measurement is possible up to the tip of the antenna.
To avoid any material damage from corrosive or aggressive media or deposit buildup on the antenna,
the end of the measuring range should be selected 10 mm (0.4 in) before the tip of the antenna.
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