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Datum Electronics RS425 Contactless Torque Transducer
Datum Electronics Size 3 RS425 Torque Transducer rated at 2kNm
RS425 Torque Sensor installed in test rig as featured in Spiralis Energy Case Study testing their Axial Skelter Tidal Hydropower Generation Technology. Image courtesy of Spiralis Energy.
RS425 torque transducer installed in Equipmake’s high‑performance electric motor testing rig.
Rs425 torque sensor size 3 on display
RS425 Contactless Torque Transducer CAD Files and Technical Drawings Available on Request - Speak to Sales
Datum Electronic’s RS425 Contactless Torque Transducer
Datum Electronic’s RS425 Contactless Torque Transducer

Datum RS425
High-Performance Torque Sensor for Dynamic and Static Applications

The RS425 Torque Transducer by Datum Electronics is a high-performance, contactless torque sensor designed for inline installation in drivetrains and test rigs.

With an Accuracy Class of 0.1, bearingless architecture, and strain-gauged shaft, the Datum RS425 delivers friction-free torque data in both static and dynamic applications. Its robust design supports high-speed, high-torque environments while maintaining long-term reliability and minimal maintenance.

Applications

  • Precision torque measurement in test rigs
  • High-speed motor and drivetrain testing
  • Torque measurement in sealed environments
  • Industrial automation with high RPM machinery
  • Automotive component fatigue and durability testing
  • Aerospace actuator and propulsion validation
  • Torque monitoring in electric motor R&D
  • Long-term torque monitoring with minimal maintenance

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Key Features
Benefits
Specifications
Downloads
Case Studies
Technical Drawings & CAD Files
FAQs

Key Features

The Datum RS425 redefines torque measurement with its contactless architecture and precision electronics. By eliminating mechanical contact between rotor and stator, it avoids wear and friction, ensuring long-term reliability. The strain-gauged shaft captures torque data directly, which is digitally amplified on-shaft and transmitted via a high-integrity communication link.

Designed to fit inline with drivetrains and test rigs using either keyway or spline shafts, the Datum RS425 offers a seamless upgrade path for existing systems. Its lightweight rotor preserves system dynamics, and its ability to withstand offset loads ensures consistent performance under demanding conditions.

System Features

  • Accuracy Class 0.1: ±0.1% Non-linearity, ±0.05% Repeatability, ±0.05% Hysteresis
  • Contactless operation: Separate rotor and stator enable frictionless torque measurement
  • Wide torque range: Standard models from 0 Nm to 30 kNm; custom builds up to 500 kNm
  • High-speed capability: Suitable for demanding driveline and motor testing
  • Robust construction: Proven to withstand offset loads and harsh operating conditions
  • Compact, inline design with standard keyway shafts
  • Flexible integration: Fits a wide variety of shaft geometries without redesign
  • Clean data transmission: Calibrated digital output ensures accuracy and reliability
  • Low maintenance: No bearings or moving contact points to wear out
  • Environmental protection: IP67-rated for water resistance and outdoor use
  • Compatible with Datum Link app for iOS, Android, and Windows devices
View RS425 Product Overview Datasheet

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Benefits

The Datum RS425 is a precision-engineered, non-contact torque transducer designed for demanding applications where reliability, speed, and minimal maintenance are critical. Its bearingless architecture and strain-gauged shaft enable frictionless torque measurement, making it ideal for high-speed drivetrains, sealed environments, and long-term testing setups. With flexible shaft compatibility and robust environmental protection, the RS425 delivers consistent performance across a wide range of industrial and R&D scenarios.

  • Zero-Contact Design: Eliminates mechanical wear and friction for extended operational life.
  • High-Speed Ready: Maintains accuracy in fast-rotating systems without compromising signal integrity.
  • Flexible Shaft Integration: Supports keyway and spline configurations for easy retrofitting.
  • Digital Signal Conditioning: On-shaft amplification ensures clean, calibrated data output.
  • Minimal Maintenance: No bearings or moving parts reduce service intervals and downtime.
  • Environmental Resilience: IP67-rated housing protects against moisture, dust, and harsh conditions.
  • Offset Load Tolerance: Engineered to maintain accuracy even under misalignment or side loads.
  • Compact Form Factor: Preserves driveline dynamics and simplifies installation in tight spaces.
  • Remote Monitoring Support: Compatible with Datum Link for real-time data access and logging.

Stockists

Specifications

RS425 ModelRated Load*Max Rotational Speed (RPM)*Rotor Mass (kg)Stator Mass (kg)
S1AL-3Nm3 N⋅m
2.2 lbf·ft		10,0000.4011.057
S1A-10Nm10 N⋅m
7.4 lbf·ft		10,0000.4011.057
S1B-20Nm20 N⋅m
14.8 lbf·ft		10,0000.4211.057
S1C-50Nm50 N⋅m
36.9 lbf·ft		10,0000.4621.057
S1D-100Nm100 N⋅m
73.8 lbf·ft		10,0000.5601.057
S2A-250Nm250 N⋅m
184.4 lbf·ft		10,0001.2011.057
S2B-500Nm500 N⋅m
368.8 lbf·ft		10,0001.2761.057
S3A-1kNm1,000 N⋅m
737.6 lbf·ft		6,0001.6681.057
S3B-2kNm2,000 N⋅m
1,475.1 lbf·ft		6,0002.1491.057
S4A-5kNm5,000 N⋅m
3,687.8 lbf·ft		5,0006.1121.152
S4B-10kNm10,000 N⋅m
7,375.7 lbf·ft		5,00012.1621.152
S5A-15kNm15,000 N⋅m
11,063.4 lbf·ft		2,00020.4992.138
S5B-20kNm20,000 N⋅m
14,751.2 lbf·ft		2,00022.3182.138
S5C-25kNm25,000 N⋅m
18,439.1 lbf·ft		2,00034.6082.138
S5D-30kNm30,000 N⋅m
22,126.9 lbf·ft		2,00040.9692.138
*Speak with our team for bespoke requirements.

Downloads

RS425 Contactless Torque Transducer Datasheet Thumbnail

RS425 Contactless Torque Transducer: Product Overview Datasheet

Technical overview of the RS425 Contactless Torque Transducer by Datum Electronics.

1 file(s) 932 KB
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Datum Link User Manual Thumbnail

Datum Link - User Manual

User manual for Datum Link software, covering app features, installation, connectivity, troubleshooting, operation and more.

1 file(s) 7.37 MB
Download

Case Studies

UPC ecoRacing case study thumbnail Datum Electronics

Case Study: Using Torque Sensors to Evaluate and Optimise Gearbox Efficiency

In this case study read how UPC ecoRacing used Datum Electronics torque sensors to measure and optimise gearbox efficiency in their Formula Student electric racecar

1 file(s) 1.58 MB
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Case Study: Condition Monitoring for Gypsum Mixers: Torque-Based Viscosity Control and Equipment Protection

Case Study: Condition Monitoring for Gypsum Mixers: Torque-Based Viscosity Control and Equipment Protection

Datum Electronics was approached by a gypsum manufacturer seeking a solution to monitor the viscosity of gypsum slurry in their mixing tanks during production. With a torque transducer, the client aimed to monitor the torque applied to the motors, enabling them to infer the viscosity of the gypsum slurry.

1 file(s) 392 KB
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RS425 torque transducer installed in Equipmake’s high‑performance electric motor testing rig.

Case Study: Improving High‑Performance Motor Testing Accuracy with the RS425 Torque Transducer

Learn how Equipmake improved high‑performance electric motor testing accuracy by integrating the RS425 contactless torque transducer, eliminating load‑cell errors and delivering reliable torque and power measurement during prototype development.

1 file(s) 943 KB
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FAQs

  • The RS425 Torque Transducer from Datum Electronics has a torque measurement range from 0-10 N·m up to 30,000 N·m as standard, with higher ratings available on request.

  • The Datum RS425 Torque Sensor is designed to fit in-line with any drive train or test rig, using a spline or a key-way shaft.  It offers zero bearing friction and is suitable for both high speed and high torque installation.

  • The RS425 Torque Transducer by Datum Electronics delivers ±0.1% accuracy, with non-linearity of ±0.1% FSD and non-repeatability of ±0.05% FSD.

  • Datum Electronics Ltd can work with the customer to calculate the expected torque using known measurement principle and suggest an appropriate torque sensor for you like our M425`

  • Datum Electronics torque sensors have a safety factor built into them for 150% overload protection. Our technical sales team will be happy to work with you to help you choose the right sensor

  • Our standard RS425 Size 1-Al is a 0-3Nm transducer which will give an accuracy of better than 0.1% of the full scale allowing for measurement in the Ncm range.

Technical Drawings & CAD Files

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RS425 Torque Transducer: STEP Files

STEP files are available on request. Please contact our sales team.

1 file(s) 0.00 KB
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RS425 Torque Transducer: Technical Drawings

Drawing packs are available on request. Please contact our sales team.

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