Siemens SIWAREX WL230 Operating Instructions Manual page 21

To ensure that no force components occur in the measuring direction, you must install guide
elements at precise right angles to the effective direction of the load cells.
Three guide elements are sufficient to statically fix a weighing platform or container.
Note
Weighing errors
With four guide elements, there is a risk of the guide elements mutually tensioning, which in
turn induces weighing errors. If you nevertheless want to use four guide elements, the guide
elements must be installed with a sufficient amount of play.
Guide elements are critical in conjunction with elastomeric bearings. Guide elements must
be installed exactly horizontal so that they do not affect the weighing result. This cannot be
guaranteed across the weighing range with soft elastomeric bearings.
Ensure that the guide elements to be used comply with the principles applicable to weighing
technology.
SB-S SA
Operating Instructions, 03/2013, A5E31529044A-01
Application planning
4.5 Guide elements
21