Specifications

METTLER TOLEDO Weigh Module Systems Handbook
(12/99)
5-6
Structural Support
Guidelines
The following guidelines provide information that can help you install a scale’s
structural supports properly.
Support Deflection
Because load cells deflect only about 0.01 to 0.03 inch at rated capacity, they
must be sensitive to very small movements. Even deflections in a tank scale’s
structural support system can affect the weight indicated by the scale. Excessive
or non-uniform deflection will introduce unwanted non-vertical forces at the load
cells, reducing a system’s accuracy and repeatability. When designing a weigh
module support structure, you should follow these three guidelines:
• The support brackets for the weigh modules should not deflect more than 1/2
degree out of level at full capacity.
• The base support structure for the weigh modules should not twist or deflect
more than 1/2 degree out of level at full capacity.
• The base support structure for the weigh modules should deflect uniformly.
The following three figures show how support deflection affects a weigh module.
Figure 5-8a Figure 5-8b Figure 5-8c
• Figure 5-8a: Support bracket is out of level, applying side forces to the load cell.
• Figure 5-8b: Support bracket and support structure are aligned properly.
Support Bracket
is Not Level
Support
Structure
is Not Level
Tank
Wall
½°
Maximum
½°
Maximum