HBM U9B, Mounting Instructions, Page: 15 / 68

15
U9B
A0137-7.0 en/de/fr HBM
with the tightening torques and information provided in section 5.3 when
mounting.
NOTE
When locking, the tightening torque must not be shunted through the trans­
ducer. Also note the limit values for bending moments and lateral forces.
5.5 Installation with knuckle eyes
Knuckle eyes prevent the application of torsional moments and, where two
knuckle eyes are used, bending moments, together with lateral and oblique
loads in the transducer. They are suitable for use with quasi‐static loads (load
cycles
v
10 Hz). Pliable tension/compression bars should be used for dy­
namic loads with higher frequencies (see section 5.3).
5.5.1 Installation and locking with initial stress
(recommended installation variant)
1. Screw the transducer locknut fully into the threaded connector.
2. Screw the knuckle eye as far as possible onto the transducer.
3. Unscrew the knuckle eye again 1 to 2 threads and align.
4. Pre‐stress the transducer to 110% operating load in tensile direction.
5. Tighten the locknut by hand.
6. Relieve the transducer.
5.5.2 Installation and locking with tightening torque
1. Screw the transducer locknut fully into the threaded connector.
2. Screw the knuckle eye as far as possible onto the transducer.
3. Unscrew the knuckle eye again 1 to 2 threads and align.
4. Tighten the locknut with the torque specified in the following table.
Nominal (rated)
force
Tightening torque
(N
⋅
m)
50N
…
1kN 8
2
…
20 kN 40
50kN 200
NOTE
When locking, the tightening torque must not be shunted through the trans­
ducer. Also note the limit values for bending moments and lateral forces.