Torque Transducer Selection Guide

Choosing the right transducer can give you better measurements and save overall costs

The selection of a torque transducer will be dependent of the following factors:

  • The mechanical space available to mount the torque transducer and the type of driveline it will be mounted in. This can be determined by selecting from the list below which offer a choice of parallel shafts with keyways, flanges and splines.
  • The torque to be measured, and the maximum torque that the transducer will be subject to during start-up, braking and other transient events. This will determine the overall size of the transducer.
  • The accuracy and performance you need from you torque transducer. The Datum range can offer you both high accuracy and high resolution. The majority of the Datum Torque Tranducer range have an accuracy of better than 0.1% of ful scale. Some transducer have a 0.05% option. The resolution of all of the 425 Series is 24bit, so at low sampling rates you will see a noise free resolution of better than 1:250000, at high sample rate up to 4000 sample per second this will reduce to 1:10,000.
  • The output you require, all of the Datum Torque Transducers output serial data that is converted to a choice of Ethernet, USB, Serial RS485/232 or analogues 4-20mA, +/-10Vdc, 0-10Vdc, +/-5Vdc. The use of serial data direct from the transducer makes the system very robust in terms of electrical noise and allows the shaft electronics to be of a higher more stable specification. The interface can then be mounted in a control panel or with the user up to 500 meters away to provide accurate analogue data.
  • The environment the torque transducer is to be used in. This may vary from a clean laboratory, to a test cell with oil and water, an engine room or even underwater. We also need to be aware of the electrical environment in terms of large motors, magnets and other items that may add noise to any data acquisition system.
  • All of Datum Electronics 425 Series Torque Transducers are continuous inductively powered allowing both static and rotary torque reading at all times.

Type or Style of Torque Transducer

If you are designing a transducer to fit a test rig or machine you have the choice of : 

  • a conventional in-line transducer

Type M425 Torque Transducer

  • a flanged in-line transducer

  • a fully non-contact in-line shaft torque transducer

  • a custom torque transducers that are designed to replace an existing shaft section or a shaft spacer


In order to determine the best transducer for you solution please call a member of our technical sales team on +44-1983-282834 or email an outline of your requirements to If you are able to include information regarding the mechanical arrangement, the environment, your output and accuracy requirements and the level of torque or power to be measured and any other special conditions this will assist us in guiding you to th ecorrect product design.


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