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Notice
If you want to use the sensor to measure alternating dynamic loads, we advise you to pre-
stress the threads. (see section 7.3). Pre-stressing only serves to protect the thread, which
could be damaged by a long-term, alternating dynamic load in a mounting that has not
been pre-stressed. If only a few alternating loads are to be measured, you can use the sen
sor without pre-stressing without reducing accuracy. There is no need for pre-stressing if
measurements are only in the tensile range or in the compressive range.
7.3
Mounting with pre-stress
If the Z4A are being used long-term to measure alternating dynamic loads (tensile and
compressive forces), we recommend fitting the threaded connector with a pre-stress that
exceeds the greatest force to be measured by at least 10%.
If the force transducer is mounted in this way, its fatigue strength will conform to the
specifications, and both alternating loads and static forces will be detected without
problem.
Force transducers with a nominal (rated) force up to and including 50 kN can be installed
using this method.
S
Screw in the force application part as far as it will go.
S
Tighten the force application part to a defined tightening torque.
We recommend using pliable (cardan) tension/compression bars as force application
parts. The suitable torques can be seen in the table below.
Nominal (rated) force in kN
20
50
Tip
As the transducers can only be pre-stressed up to a nominal (rated) force of 50 kN, we
recommend using a U10M as an alternative for alternating loads and higher nominal
(rated) forces.
7.4
Mounting with knuckle eyes
Knuckle eyes are used in this mounting variant. These mounting aids prevent the applica
tion to the transducer of torsional moments and, where two knuckle eyes are used, bend
ing moments, as well as lateral and oblique loads.
Z4A
MECHANICAL INSTALLATION
Tightening torque M
70
200
in N·m
A
15
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