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

Structure and mode of operation

5 Structure and mode of operation
5.1

Transducer

The measuring element is a 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 arranged in each
measuring circuit so that four are extended and the other four shortened when
a force acts on the transducer. Each strain gage changes its ohmic resistance
in proportion to its change in length and so misaligns the Wheatstone bridge. If
bridge excitation
voltage is present, the circuit produces an output signal proportional to the
change in resistance and thus also proportional to the applied force. The ar­
rangement of the SGs is selected so that parasitic forces or torques and tem­
perature effects are compensated as much as
possible.
5.2

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. This procedure offers the SG a high level
of protection against environmental influences. In order to retain the protective
effect, these plates must not be damaged in any way.
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A01385_06_YIC_06 HBM: public
U10M/U10S