Endress+Hauser Levelflex FMP56 Manual page 25

Levelflex FMP56, FMP57
Endress+Hauser
Securing rod probes
• Rod probes must be supported if there is a horizontal flow (e.g. from an agitator) or in the case of strong
vibrations.
• Rod probes may only be supported at the end of the probe.
NOTICE
Poor grounding of the end of probe may cause measuring errors.
Apply a narrow sleeve which has good electrical contact to the probe.
►
NOTICE
Welding may damage the electronics.
Before welding: Ground the probe and dismount electronics.
►
Securing rope probes
C
2
A Sag of the rope: ³ 1 cm per 1m of the probe length (0.12 inch per 1 ft of the probe length)
B: Mounting and contact with a bolt
C
Mounting kit isolated (® ä 49)
1 Reliably grounded end of probe
2 Reliably isolated end of probe
• 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
– for 4 mm (1/6") rope: M 14
– for 6 mm (1/4") rope: M 20
• 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 (® ä 49).
• 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: (® ä 21)
B
1
A0012609
25