Securing The Probe - Endress+Hauser Levelflex FMP56 Operating Instructions Manual

Levelflex FMP56, FMP57 FOUNDATION Fieldbus
Endress+Hauser
6.1.5

Securing the probe

Securing rope probes
C
2
A Rope sag: ≥ 10 mm/(1 m probe length) [0.12 in/(1 ft probe length)]
B Reliably grounded end of probe
C Reliably insulated end of probe
1 Fastener in female thread of probe end weight
2 Insulated fastening kit
• The end of the rope probe must be secured (fixed down) under the following conditions:
• If the probe would otherwise temporarily come into contact with the vessel wall, the
cone, internal fittings/beams or another part of the installation
• If the probe would otherwise get closer than 0.5 m (1.6 ft) to a concrete wall.
• A female thread is provided in the probe weight to secure the end of the probe:
• Rope 4 mm (1/6"), 316: M 14
• Rope 6 mm (1/4"), 316: M 20
• Rope 6 mm (1/4"), PA>steel: M14
• Rope 8mm (1/3"), PA>steel: M20
• Far higher tensile loads occur on the probe when it is secured (fixed down). Therefore,
preferably use the 6 mm (1/4") rope probe.
• When fixed down, the end of the probe must be either reliably grounded or reliably
insulated. Use an insulated fastening kit if it is not otherwise possible to secure the
probe with a reliably insulated connection.
• If grounded fastening is used, the search for a positive probe end echo must be activated.
Otherwise, automatic probe length correction is not possible.
Navigation: Expert → Sensor → EOP evaluation → EOP search mode
Setting: Positive EOP option
• To prevent an extremely high tensile load (e.g. due to thermal expansion) and the risk of
the rope breaking, the rope must be slack. Required sag: ≥ 10 mm/(1 m rope length)
[ 0.12 in/(1 ft rope length)].
Pay attention to the tensile loading capacity of rope probes.
B
1
Mounting
A0012609
27