Structure And Mode Of Operation; Transducer; Sg Covering Agent - HBM C10 Montageanleitung

Structure and mode of operation

4 Structure and mode of operation
4.1

Transducer

The measuring body is a loaded member made of steel (for nominal (rated)
forces from 25 kN) or high-strength aluminum (for nominal (rated) forces up to
2.5 kN, 5 kN and 10 kN), on which strain gages (SG) are installed. The
influence of a force deforms the measuring body, so there is deformation in
places where the strain gages are installed. For each measuring circuit
(measuring bridge), the strain gages are attached so that four are stretched
and four are compressed. The strain gages are wired to form a Wheatstone
bridge circuit. They change their ohmic resistance in proportion to their change
in length and so unbalance the Wheatstone bridge. If there is an excitation
voltage, the circuit produces an output signal proportional to the change in
resistance and thus also proportional to the applied force. The strain gage
arrangement is chosen to compensate, as much as possible, for parasitic
forces and moments (e.g. lateral forces and torques), as well as the effects of
temperature.
4.2

SG covering agent

To protect the SG, the force transducers have thin cover plates that are welded
(steel versions) or glued (aluminum versions) top and bottom. In combination
with the integrated cable, the steel versions achieve protection class IP68.
Both variants offer good protection against environmental influences in general.
In order to retain the protective effect, these plates must not be removed or
damaged in any way.
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A04036_01_YI0_03 HBM: public
C10