How to Select the Right Rotating Torque?

The torque sensor guarantees the right measurement and is identical to the mechanical fuse in design. To prevent the mechanical failure, it is essential to select the ideal torque sensor as it is the weakest part of the driveline. Simultaneously, the uncertainty of the torque data an impacts the accuracy of the torque sensor as well. Consider all the electrical equipment of the torque sensor to get the right one. If you want to invest in load cell displays or are interested to know more about load cell signal conditioning, feel free to get in touch with us today.

Reaction torque sensor

Reaction torque sensors don’t rotate and works similar to that of a load cell and a lever arm without needing anything.


  1. Less considerations as it doesn’t rotate
  2. Inexpensive to use
  3. No changes needed for the rotating shaft


  1. The sensors have less dynamic response time because of the mass of the dynamometer
  2. They don’t measure accurate torque in the shaft

Circular Shaft – Slip Ring-Style Torque Sensor

This features graphite brushes that are in touch with silver alloy slip rings.


  1. Low torque at reasonable price
  2. Low inertia
  3. High response times
  4. AC or DC excitation
  5. Mounting options.


  1. Too noisy
  2. Brush needs maintenance and is prone to errors
  3. Bears maintenance
  4. RPM cons
  5. Stiff
  6. Backlash or key imbalance.

Circular Shaft – Rotary Transformers

The mechanism of the circular shaft is identical to the slip ring sensor. But they use the rotary transformers instead of the brushes and slip rings. One transformer excites the torque sensor and other take the data back.


  1. Higher RPM rating than the slip rings
  2. Mounting options
  3. Low torque at affordable price
  4. Low inertia
  5. Non-contact data transmission.


  1. Sensitive to vibration
  2. Use of the AC excitation source
  3. Stiff
  4. Backlash and key imbalance
  5. Too noisy
  6. Needs maintenance and prone to errors
  7. Low response time
  8. RPM limits.

Circular shaft – clamp-on style torque sensors

They are used when an in line torque sensor requires to be installed without breaking away the shaft.


  1. Higher RPM ratings
  2. Low torque capacity ranges
  3. Low cost for high torque ranges


  1. Needs mathematical calculations
  2. Hard to repeat
  3. Low accuracy or high uncertainty

Analog telemetry torque sensor

It is an accurate and affordable sensor that is available since the early 1990s.


  1. Weight and length
  2. Low electrical noise
  3. High RPM ratings
  4. Low or virtually no backlash
  5. Stiffness
  6. Non-contact data transmission

Comments are closed.