Structure And Mode Of Operation; Transducer; Sg Cover - HBM U10M Montageanleitung

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Structure and mode of operation

3.1 Transducer

The measuring element is a steel loaded member made of steel (for nominal
(rated) forces from 12.5 kN) or high-strength aluminum (for nominal (rated)
forces up to 5 kN) to which strain gages (SG) are applied. The SG are ar-
ranged in each measuring circuit so that four are stretched and the other four
compressed when a force acts on the transducer. Each strain gauge changes
its ohmic resistance in proportion to its change in length and so misaligns the
Wheatstone bridge. If there is an excitation voltage, the circuit produces an
output signal proportional to the change in resistance and thus also propor-
tional to the applied force. The arrangement of the SGs is selected so that
parasitic forces or torques and temperature influences are essentially com-
pensated for.

3.2 SG cover

To protect the SG, the force transducers have thin cover plates that are
welded (steel versions) or glued (aluminum versions) top and bottom. This
procedure offers the SG a high protection against environmental influences. In
order to retain the protective effect, these plates must not be damaged in any
way.
HBM
U10M, U10S
A1385−6.0 en/de/fr