Mounting With Direct Bolted Connection; Mounting With Knuckle Eyes - HBM S9M Montageanleitung

Nominal (rated) force in kN
20
50
Notice
When locking, the tightening torque must not be shunted through the transducer.
Mounting with initial stress is preferable to mounting with a defined tightening torque.
7.3.2

Mounting with direct bolted connection

In this mounting variant, the transducer is mounted directly on an existing construction
element and can then measure in the tensile and compressive directions. Alternating
loads are also correctly recorded if the transducer is mounted without axial play. For dy­
namic alternating loads, the tightening torque for the screws must be selected so that the
screws are pre-stressed to above the maximum operating load of the transducer. Comply
with the tightening torques and information provided in Section 7.3.1 when mounting us­
ing torque.
7.3.3

Mounting with knuckle eyes

Knuckle eyes prevent the application of torsional moments on the transducer and also,
when two knuckle eyes are used, bending moments, together with lateral and oblique
loadings. They are suitable for use with quasi-static loading (load cycles v10 Hz). Pliable
tension/compression bars should be used for dynamic loads with higher frequencies
(see Section 7.3.1).
1. Installation of knuckle eyes and locking with initial stress (recommended mounting
variant):
- Unscrew the locknut up to the eye
- Screw the knuckle eye into the transducer (note permissible thread reach)
- Unscrew the knuckle eye 1 to 2 threads, and align it
- Load the knuckle eye at 110% of the operating load in the tensile direction
- Hand-tighten the locknut
- Unload the transducer
2. Installation of knuckle eye and locking with torque:
- Unscrew the locknut up to the eye
- Screw the knuckle eye into the transducer (note permissible thread reach)
- Align the knuckle eye
- Tighten the locknut to the following torques
S9M
MECHANICAL INSTALLATION
Thread on transducer
M24X2
M24X2
Tightening torque in NVm
200
500
15