Endress+Hauser Levelflex FMP56, Руководство по эксплуатации

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Mounting Levelflex FMP56, FMP57 FOUNDATION Fieldbus
32 Hauser
6.1.5 Securing the probe
Securing rope probes
1
A
C
B
2
A0012609
A Sag of the rope: ≥ 1 cm per 1m of the probe length (0.12 inch per 1 ft of the probe length)
B Reliably grounded end of probe
C Reliably isolated end of probe
1: Mounting and contact with a bolt
2 Mounting kit isolated
• The end of the probe needs to be secured under the following conditions:
– if otherwise the probe sporadically comes into contact with the wall of the vessel, the
outlet cone, internal fittings or other parts of the installation.
– if otherwise the probe sporadically gets close to a concrete wall (minimum distance 0.5
m / 20 inch).
• The end of probe can be secured at its internal thread
– rope 4 mm (1/6"), 316: M 14
– rope 6 mm (1/4"), 316: M 20
– rope 6mm (1/4"), PA>steel: M14
– rope 8mm (1/3"), PA>steel: M20
• Preferably use the 6 mm (1/4") rope probe due to the higher tensile strength when
fixing a rope probe.
• The fixing must be either reliably grounded or reliably insulated. If it is not possible to
mount the probe weight with a reliably insulated connection, it can be secured using an
isolated eyelet, which is available as an accessory.
• In the case of a grounded fixing the search for a positive end-of-probe signal must be
activated. Otherwise an automatic probe length correction is impossible.
Navigation: Expert → Sensor → EOP evaluation → EOP search mode
Setting: Positive EOP option
• In order to prevent an extremely high tensile load (e.g. due to thermal expansion) and
the risk of rope crack, the rope has to be slack. Make the rope longer than the required
measuring range such that there is a sag in the middle of the rope that is ≥ 1cm/(1 m
rope length) [0.12 inch/(1 ft rope length)].
Tensile load limit of rope probes: →  24