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Static Torque Sensors – Precise Reaction Torque Measurement Without Rotation
A static torque sensor (reaction torque sensor) measures torque in stationary or slowly moving systems where no shaft rotation occurs. Unlike rotating (dynamic) torque sensors, a static sensor is fixed to the test object and directly captures the so-called reaction torque. These sensors are ideal for applications where there is no continuous rotation, but where the force acting on a shaft or another stationary component needs to be measured.
What characterizes a Reaction Torque Sensor?
- No rotation required
The sensor measures force transmission when the component is stationary or moving very slowly. It is typically connected to the test object via a rigid coupling or flange. - Strain gauge (SG) technology
High-precision measurements are usually based on bonded strain gauges, which convert mechanical deformation into electrical signals through linear resistance changes. - Simple signal transmission
Power supply and signal output are transmitted via cables—no complex telemetry systems are required.
How to choose the right Reaction Torque Sensor
- Measurement range & accuracy class
Typical ranges extend from a few Nm up to tens of thousands of Nm, with accuracies as high as ±0.05% FS. - Design & mounting
Options include flange or square drive designs with high torsional stiffness and compact form factors (e.g., torque flange sensors). - Environmental conditions
Consider protection ratings (e.g., IP class for moisture), temperature influences, and external disturbances such as bending moments or lateral forces. - Signal output & interfaces
Options include mV/V output or integrated amplifiers, as well as digital interfaces like USB or EtherCAT if required. - Calibration & maintenance
For long-term accuracy, regular calibration (e.g., DAkkS-accredited) is recommended—typically on an annual basis.
Difference Between Static and Dynamic Torque Sensors
- Feature
- Static (Non-Rotating)
- Dynamic (Rotating)
Measurement
- Reaction torque, no rotation
- Torque in rotating systems (real-time)
Signal transmission
- Wired
- Slip rings or contactless telemetry
Applications
- Test benches, torque tools, calibration
- Motors, machinery, rotating systems
Measurement range
- High static torque
- High speed and varying loads
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Simple & ruggedMeasurement as a reaction torque – without rotating signal transmission (no telemetry or slip rings).
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Compact & rigidSpace-saving integration with high mechanical stability and reproducible measurement results.
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Ideal for testing and calibration tasksReliable for holding and clamping applications, tool inspection and test set-ups.
Advantages of a Reaction Torque Sensor
- Highest accuracy during slow or stationary conditions: Particularly suitable for testing and calibration scenarios
- Robust, simple installation: No slip rings or complex components; often flange-mounted for shaft support
- Low maintenance & long service life: No wear caused by moving parts; high resistance to harsh environments
- Flexible scaling: Measurement ranges from sub-Nm to 50 kNm achievable, with customised solutions
Common applications
- Test benches and calibration facilities: Reliable determination of tightening torques, reaction torques or screw force tests
- Quality assurance for screwdriving tools: Correctly set tightening torque prevents errors or damage
- Research & development: Precise data for drive or material tests, including in laboratory environments
- Automotive, aerospace and mechanical engineering: Where slow force application with high precision is required
A reaction torque sensor is the first choice when reaction torque needs to be measured precisely in non-rotating or slowly varying systems. Thanks to its robust design, high-precision strain gauge technology and simple installation, it can be used flexibly – from trade applications to high-tech industries. For applications in your test bench, laboratory or assembly process, Althen offers suitable standard and customised solutions with comprehensive consultancy and calibration services.
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Frequently asked questions about reaction torque sensors
Answers to the most important technical Questions
What measuring ranges are available for static torque sensors?
Depending on the design, static torque sensors cover measuring ranges from very small torque values up to high industrial and test-bench loads. Althen specifies measuring ranges from the sub-Nm range up to 50 kNm. This makes static torque sensors suitable for fine measurement tasks in research, development, calibration and torque-tool testing, as well as for robust applications in mechanical engineering, test benches, quality assurance and high reaction torques. The appropriate measuring range should always be selected with sufficient reserve relative to the maximum expected load. In addition to the rated torque, overload reserve, accuracy, sensor design, mounting, force introduction, environmental conditions, output signal and calibration should also be considered. For special requirements, Althen also offers custom solutions and complete measurement chains.
What should be considered when measuring static torque?
Proper mechanical integration is essential for static torque measurement. The sensor must be selected to match the expected torque range and mounted so that the reaction torque is introduced directly and reproducibly into the sensing element. Influences such as bending, side loads, misalignment, tilting or non-aligned connections should be minimised because they can affect measurement accuracy. The measuring range, accuracy class, sensor design and mounting method are also important. Althen static torque sensors are typically integrated using flange or square-drive connections and are suitable for stationary or slowly changing torques. Depending on the application, measuring ranges from the sub-Nm range up to 50 kNm and custom solutions are available. Since static torque sensors do not rotate, signal transmission is cable-based. Depending on the design, mV/V outputs, integrated amplifiers or digital interfaces such as USB or EtherCAT are available. For long-term measurement accuracy, environmental conditions such as temperature, humidity, protection rating and electrical interference should be considered. For test benches, calibration tasks, torque-tool testing or quality-critical measurements, regular calibration of the complete measurement chain is recommended. Althen can support the selection of the appropriate static torque sensor, signal conditioning and calibration for the specific application.