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7.3
Mounting with pre-stress
If the U15 are being used to measure alternating dynamic loads (tensile and compressive
forces) over the long term, we recommend mounting the threaded connector with a pre-
stress that exceeds the greatest force to be measured by at least 10%.
There are two ways to do this:
1. Pre-stressing with defined tightening torque
This method can be applied to all sensors up to a nominal (rated) force of 50 kN.
u
Screw the force application part onto the upper load application bolt as far as the re
tainer, or into the lower internal thread of the adapter.
u
Unscrew the force application parts two revolutions.
u
Pre-stress the force application part with defined tightening torque.
Nominal (rated)
force in kN
2.5
5
10
25
50
2. Pre-stressing with tensile forces
Force transducers with any nominal (rated) force can be mounted using this method. The
procedure should always be used in dynamic sustained loading for force transducers
from 100 kN, as the torsional moments required for the locknut would be too high in
method 1.
u
Screw the locknuts onto the load application part, for connection to the internal thread
in the lower adapter, or to the load application bolt on the upper side of the U15.
Screw the load application part in as far as possible (up to the retainer).
u
Unscrew the force application part two revolutions.
u
Load the force transducer in the tensile direction to no more than 120% of the maxi
mum operating force. The following table shows the tensile forces to be applied when
the transducer is subsequently loaded with the nominal (rated) force. Correspondingly
smaller tensile forces can be used for applications in small force ranges. The force
transducer that is being mounted can be used to measure the pre-stress force.
U15
MECHANICAL INSTALLATION
Tightening torque
M
in N·m
A
17
35
68
135
135
Depth of engagement in the internal
thread of the adapter in mm
26.4
26.4
26.4
26.4
26.4
17
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