Levelflex M FMP40
34 Endress+Hauser
Probe selection (→ ä 6)
• For interface measurement, ideally coax probes or rod probes are used in the bypass/stilling well.
• Coax probes are suited to liquids with viscosities of up to approx. 500 cst. Coax probes can measure most
liquefied gases, as of a dielectric constant of 1.4. Moreover, installation conditions, such as nozzles, tank
internal fittings etc., have no effect on the measurement when a coax probe is used. A coax probe offers
maximum EMC safety when used in plastic tanks.
• Rod or rope probes for free installation in the tank available on request. Rope probes for free installation in
the tank must always be used with a rod weight in accordance with special products MVTFN0203 or
MVT6N0186. Rope probes may not be used in the bypass/stilling well since the end weight always causes
interference reflection which can be misinterpreted during interface measurement.
Special information on
interface measurement
Installation in horizontal cylindrical, upright and underground tanks
• Use coax probes or rod probes in the bypass/stilling well. A separable probe is available as a special version
for longer measuring ranges.
• Any distance from the wall is possible for coax probes or rod probes in the stilling well. In the case of rod
probes, it must be ensured that the probe does not come into contact with the wall.
L00-FMP4xIxx-17-00-00-xx-002
Installation in stilling well or bypass
• A rod probe can be used for pipe diameters bigger
than 40 mm.
• Rod probe installation can take place up to a
diameter size of 100 mm. In the event of larger
diameters, a coax probe is recommended.
• Welded joints that protrude up to approx. 5 mm
inwards do not influence measurement.
• The pipe may not exhibit any steps in diameter.
• If a rod probe is used, the probe length must be
100 mm longer than the lower disposal.
• In the case of rod probes, it must be ensured that
the probe does not come into contact with the wall.
If necessary, use a centering disk at the end of the
probe.
Note!
A plastic centering disk has to be used for interface
measurement (→ ä 65, "Accessories").
L00-FMP4xIxx-17-00-00-xx-003
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