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Les langues disponibles
5
STRUCTURE AND MODE OF OPERATION
5.1
Force transducer operation
The measuring body is a steel spring element to which strain gages are applied. The
strain gages for each measuring circuit are installed so that four extend and four shorten
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 exci
tation voltage is present, the circuit produces an output signal proportional to the change
in resistance and therefore also proportional to the applied force. The strain gages are
arranged such that parasitic forces or torques and temperature effects are compensated
as much as possible. The Z4A transducer has a spherical threaded pin at the top for
applying tensile forces (also suitable for introducing compressive forces) and a threaded
hole at the bottom.
5.2
Strain gage covering agent
To protect the strain gage, the housing with the integrated range spring system is hermet
ically sealed on its top and bottom by metallic membranes so that no moisture can dam
age the sensitive application. This method provides the strain gages with a high degree
of protection against environmental influences. In order to retain their protective effect,
the metallic membranes must not be damaged in any way.
5
Fig. 5.1
Strain gage covering agent
10
4
2
6
2
3
1 Measuring body
2 Closure membranes
3 Strain gage
4 Threaded pin
5 Cable box
6 Threaded hole
STRUCTURE AND MODE OF OPERATION
1
Z4A
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