HBM KMR Mounting Instructions page 11

KMR
F
meas
F
P
A2114-1.1_en/de
S Monitoring working loads with bolted connections
When using the KMR in a bolted connection to monitor
working loads (e.g. pressure increase in a value, press
forces), you have to take into account the stress diagram
for bolted connections.
The KMR measures the change in the screw preload. If
you want to deduce the working load from the force
F , then the actual stiffness of the screw and of the
meas
screwed parts must be considered.
F = changed preload due to the working load
meas
F = Screw preload
P
F = Working load
W
Change in length
Fig. 6.2 Stress diagram
F
meas
F
W
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