HBK HBM RTN Montageanleitung Seite 11

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.
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The base plate of the load cell has to satisfy certain special requirements: Thermal
expansion coefficient of 11·10
hardness more than 40 HRC.
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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
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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
4. Wind forces when installed outdoors
5. Drive motors/mixers
If the lateral forces remain below the values specified in the data sheet, measurement
errors may occur but the load cell will not suffer any lasting damage.
If there is a risk that the permissible lateral forces may be exceeded, suitable measures
such as stay rods or buffers must be provided.
If the load cell is subjected to normal force, greater lateral forces dependent on the nor­
mal force may be transferred due to base plate friction.
If high lateral forces can be expected in your application, we recommend the use of pen­
dulum bearings from HBM to minimize the lateral forces dependent on the normal force
that acts on the load cell.
Also see section 1 "Safety instructions" on page 3.
RTN
MOUNTING INSTRUCTIONS
-6
/K; flatness less than 0.05 mm; roughness Ra 3.2;
9