HBM RTN Mounting Instructions page 12

Mounting instructions
S The optional cable with outer braided wire sheath is intended for use when
there is increased mechanical stress (e.g. damage caused by gnawing
rodents). If this cable is used, the outer braided wire is connected to
potential equalization at least once, to avoid accidental energization. This
outer braided wire is not used to shield the load cell. Instead, the inner
braided wire of the load cell cable (also see section 5.5 "EMC protection",
page 15) is used for shielding.
Notice
Load cells are precision measuring elements and need to be handled carefully.
Dropping or knocking the transducer may cause permanent damage. Make
sure that the transducer cannot be overloaded, including while it is being
mounted.
Preparations for mounting
S The installation space or foundations must be level and horizontal.
S The base plate of the load cell has to satisfy certain special requirements:
Thermal expansion coefficient of 11·10
roughness Ra 3.2; hardness more than 40 HRC.
S For correct function, always use the original HBM base plate. This is
included with the VEN and VPN installation accessory from HBM.
Mechanical sources of error
Lateral forces
S Load acts on the load cell from other directions than the measurement
direction, due to incorrect mounting or insufficient bending stiffness of the
construction.
During operation, lateral forces may occur in the following conditions:
1. Braking forces of a vehicle on a weighbridge
2. Deflections in the construction
3. Expansion in the construction due to raised temperatures
10
A01153_03_Y00_01 HBM: public
-6
/K; flatness less than 0.05 mm;
RTN