Endress+Hauser Levelflex FMP56 Operating Instructions Manual page 18

Installation
18
• Product structure, feature 600 "Probe design":
• Version MB "Remote sensor, 3 m cable"
• Version MC "Remote sensor, 6 m cable"
• Version MD "Remote sensor, 9 m cable"
• The connecting cable is included in the delivery with these versions.
Minimum bending radius: 100 mm (4 inch)
• The mounting bracket for the electronics housing is included in the delivery with these
versions. Mounting options:
• Wall mounting
• Mounting on DN32 to DN50 (1¼ to 2 inch) post or pipe
• The connecting cable has one straight plug and one plug angled at 90 °. Depending on
the local conditions the angled plug can be connected at the probe or at the electronics
housing.
The probe, electronics and connection cable are mutually compatible and bear a
common serial number. Only components with the same serial number may be
connected to one another.
6.1.3 Notes on the mechanical load of the probe
Tensile load
Bulk solids exert tensile forces on rope probes which increase with:
• The probe length, i.e. the maximum cover
• The bulk density of the product
• The silo diameter and
• The diameter of the probe rope
As the tensile forces also depend greatly on the flowability of the product, a higher safety
factor is necessary for highly viscous products and if there is a risk of cornice buildup. In
critical cases it is better to use a 6 mm (0.24 in) rope instead of a 4 mm (0.16 in) one.
The same forces also act on the silo ceiling. The tensile forces on a fixed rope are always
greater, but cannot be calculated. Observe the tensile loading capacity of the probes.
Ways to reduce the tensile forces:
• Shorten the probe.
• If the maximum tensile load is exceeded, check whether it would be possible to use a
non-contact ultrasonic or level radar device.
The following diagrams show typical loads for common bulk solids as reference values. The
calculation was performed for the following conditions:
• Calculation according to DIN 1055, Part 6 for the cylindrical part of the silo
• Suspended probe (probe end not fixed at the bottom)
• Free-flowing bulk solid, i.e. mass flow. A calculation for core flow is not possible. In the
event of collapsing cornices, considerably higher loads can occur.
• The specification for tensile forces contains safety factor 2 (in addition to the safety
factors already contained in DIN 1055), which compensates for the normal fluctuation
range in pourable bulk solids.
Levelflex FMP56, FMP57 HART
Endress+Hauser