HBM HBK S2M, Mounting Instructions, Page: 16 / 124

S2M
MECHANICAL INSTALLATION
14
7.3 Mounting the S2M
7.3.1 Mounting with tension/compression bars
In this mounting variant, the transducer is mounted with tension/compression bars on a
construction element and can then be measured in the tensile and compressive
directions. Alternating loads are also correctly recorded if the transducer is mounted
without axial play. For dynamic alternating loads, the upper and lower threaded
connectors must be pre‐stressed to above the maximum operating load and then locked
in place.
1. Installation and locking with initial stress:
S
Screw in the threaded connector
S
Pre‐stress transducer to 110% operating load in tensile direction
S
Hand‐tighten locknut
S
Relieve load on transducer
The transducer itself can be used to measure the initial stress.
2. Installation and locking with torque
S
Screw in the threaded connector
S
Tighten locknut with a torque of 15Nm.
Notice
When locking, the tightening torque must not be shunted through the transducer.
7.3.2 Mounting with direct 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
dynamic alternating loads, the screw connected to the rigid force transfer must be
tightened with a torque of 15Nm.
7.3.3 Mounting with knuckle eyes
Knuckle eyes prevent the application of torsional moments on the transducer and also,
when 2 knuckle eyes are used, bending moments, together with lateral and oblique
loadings. Although if two knuckle eyes are used, only tensile forces can be measured.
Knuckle eyes are suitable for use with quasi‐static loading (load cycles
v
10 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:
S
Rotate the locknut back to the eye.