Sensor Technology 2016
Page 4
RWT3745V (Rev 2)
Mechanical Installation
To obtain the best measurements from your torque transducer it is essential that it is
correctly installed.
To avoid damaging the transducer during the installation process it is highly recommended
that it is electrically connected and working so that any torque overloads applied due to
handling can be monitored.
For Transducers above 1Nm or 10lbf.in.
it is recommended that the body of the
transducer is restrained from rotation using a strap or straps connected to the tapped holes
in the end plates and that it is not rigidly mounted. Couplings should be used to allow for
angular misalignment while the transducer shaft takes up any parallel misalignment. Care
should be taken not to induce any end loads or bending moments to the shaft, see below,
as these may induce inaccuracies to the torque measurement and in extreme cases
damage the transducer.
Should rapid variations in torque need to be measured in detail e.g.
torque fluctuations in gearboxes or multi vane pumps then it is
recommended using torsionally rigid couplings fitted at both ends of
the transducer shaft such as single membrane couplings and that
these are
correctly selected for the transducer rating and speed
.
An undersized coupling will not transmit the torque while the high
inertia of an oversized coupling can result in instantaneous peak
torques far in excess of the measured torque. Alternatively, for lower
bandwidth applications where it is more important to measure the
‘average’ torque rather than fast torque fluctuations then couplings
with a degree of compliance would be more appropriate.
Never use a solid coupling to connect a RWT series transducers
Torque Transducer
For Transducers below
1Nm or 10lbf.in
or if the application
requires the body to be
rigidly mounted
then it is recommended that
double couplings should be used at each end to compensate for any
misalignment of the input/output shafts and the system designed to
eliminate any end loads on the transducer shaft. For applications
where
end loads cannot be avoided
please consult the sales
department for advice
prior to ordering.
When using a pulley or pulleys it is recommended a bearing block or
blocks should be used to ensure bending loads are not transmitted to
the transducer.
Lastly, consider using a guard over the transducer and couplings
Single membrane
coupling
(Flexible mounting)
Double membrane
coupling
(Rigid mounting)
Summary of Contents for RWT420
Page 23: ......
Page 31: ...Transducer Control 5 User Manual Revision 5 December 2016...
