Endress+Hauser Levelflex FMP51 Modbus Technical Information page 38

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• Pipe diameter: > 40 mm (1.6") for rod probes
• Rod probe installation can take place up to a diameter size of 150 mm (6 in). In the event of larger
diameters, a coax probe is recommended.
• Side disposals, holes or slits and welded joints that protrude up to approx. 5 mm (0.2") inwards do
not influence the measurement.
• The pipe may not exhibit any steps in diameter.
• The probe must be 100 mm longer than the lower disposal.
• Within the measuring range, the probe must not get into contact with the pipe wall. If necessary,
secure the probe by retaining or tensioning. All rope probes are prepared for tensioning in
containers (tensioning weight with anchor hole).
• If a metallic center washer is mounted at the end of the probe, it enables a reliable recognition of
the end-of-probe signal (see feature 610 of the product structure).
Note: For interface measurements only use the nonmetallic centering star made of PEEK or PFA
(feature 610, options OD or OE).
• Coax probes can always be applied if there is enough mounting space.
For bypasses with condensate formation (water) and a medium with low dielectric constant
(e.g. hydrocarbons):
In the course of time the bypass is filled with condensate up to the lower disposal and for low
levels the the level echo is superimposed by the condensate echo. Thus in this range the
condensate level is measured instead of the correct level. Only higher levels are measured
correctly. To prevent this, position the lower disposal 100 mm (4 in) below the lowest level to
be measured and apply a metallic centering disk at the height of the lower edge of the lower
disposal.
With heat insulated tanks the bypass should also be insulated in order to prevent condensate
formation.
Levelflex FMP51 Modbus
Endress+Hauser