See the latest Datum M425 case study Read More
Image of an M425 Inline Rotary Torque Sensor by Datum Electronics. Ideal Keyway Shaft Torque Transducer for Torque Measurement.
M425 Torque Transducer by Datum Electronics, as featured in Plextek's case study on Independent Torque Measurement for Back‑to‑Back Motor Controller Testing. Image courtesy of Pletek.
Testbed for Kawasaki Ninja ZX-6R Dynamometer featuring a Datum Electronics M425 Torque Transducer. Image courtesy of EUFS.
Image of a Datum Electronics Inline Digital Torque Reader as deatured in Stannah case study Using A Digital Torque Sensor To Measure Motor Efficiency. Image courtesy of Stannah.
Image of a Datum M425 Torque Transducer used in a custom dynamometer to test an electric motor as featured in Motivity Ltd case study. Image Courtesy of Motivity Ltd.
Image of a Datum M425 Torque Sensor testing Measuring Pump-as-Turbine (PAT) Efficiency in Micro Hydropower (MHP). Image courtesy of Dŵr Uisce and Trinity College Dublin.
Image of an M425 Torque Sensor Installed in a Custom Gear Motor Test Bench from Mellor Electrics case study. Image courtesy of Mellor Electrics.

Datum M425
High-Accuracy Torque Measurement for Rotating Machinery

The M425 Torque Transducer by Datum Electronics is a high-precision dynamic torque sensor designed for inline torque, speed, and power measurement in rotating systems. Built with a non-contact signal transmission system and available in a wide range of torque capacities, it’s ideal for motor, gearbox, pump, and drivetrain testing.

With an Accuracy Class of 0.1 and a variety of digital or analogue outputs, the Datum M425 delivers reliable, repeatable data for R&D, test rigs, dynamometers, and other industrial applications. Its robust, compact design and flexible output options make it easy to integrate into demanding environments.

Applications

  • Ideal for motors, gearboxes, pumps, and rotating machinery
  • Compact design for easy integration into test rigs or drivetrains
  • Pump and compressor performance monitoring
  • Industrial mixer and agitator torque analysis
  • Automated machinery diagnostics and control
  • Electric vehicle drivetrain development
  • Energy efficiency testing in rotating systems
  • Torque validation in production and QA environments
M425 Datasheet

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

Key Features

The Datum M425 is a rotary torque sensor designed for inline installation in rotating systems. It provides precise, real-time measurement of torque, speed, and power, making it ideal for test benches, R&D environments, and industrial monitoring.

With a wide torque range of 0-10 N·m to 30,000 N·m in standard variants, and higher ratings available on request, the Datum M425 is suitable for everything from small electric motors to large industrial drives. Its non-contact signal transmission eliminates wear and ensures long-term reliability, even in high-speed or high-vibration environments.

System Features:

  • Accuracy Class 0.1: ±0.1% Non-linearity, ±0.05% Repeatability, ±0.05% Hysteresis
  • Optional speed and power outputs
  • Digital sample rate 100 SPS as standard (upgradable to 4,000 SPS please enquire)
  • Analogue sample rates from 20-100 SPS
  • Compact, inline design with standard keyway shafts
  • Custom shaft, mounting options, and mechanical interfaces available
  • Robust construction for continuous use in industrial test setups
  • Easy integration into motors, gearboxes, pumps, and drivetrains
  • Compatible with Datum Link app for iOS, Android, and Windows devices

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Benefits

The Datum M425 offers a compact, non-contact solution for capturing torque, speed, and power data in rotating systems. Designed for seamless integration into motors, gearboxes, pumps, and drivetrains, it delivers high-accuracy measurements with minimal setup complexity. Its robust construction and flexible output options make it ideal for both industrial environments and precision test rigs.

  • Inline Installation: Easily fits into existing drive systems without requiring major modifications.
  • Non-Contact Signal Transmission: Reduces wear and ensures long-term reliability in high-speed or high-vibration setups.
  • Flexible Output Options: Supports both analogue and digital formats, including RS232, RS485, ±10V, and 4–20mA.
  • Wide Torque Range: Available from 0–10 Nm up to 30,000 N·m, with custom variants for larger applications.
  • Compact Form Factor: Ideal for space-constrained setups like test benches and prototype rigs.
  • Real-Time Monitoring: Enables dynamic torque and power analysis for performance optimization.
  • Custom Shaft & Mounting Options: Tailored to fit a variety of mechanical configurations.
  • Compatible with Datum Link: Streamlines data acquisition and integration with existing systems.

Stockists

Specifications

M425 ModelRated Load*Standard RPM Range*Pulse Per RevOverall LengthBody LengthBody Diameter
S1-10Nm10 N⋅m
7.4 lbf·ft		1-10,00030184 mm
7.24 in		130 mm
5.19 in		66 mm
2.59 in
S1-20Nm20 N⋅m
14.8 lbf·ft		1-10,00030184 mm
7.24 in		130 mm
5.19 in		66 mm
2.59 in
S1-50Nm50 N⋅m
36.9 lbf·ft		1-10,00030184 mm
7.24 in		130 mm
5.19 in		66 mm
2.59 in
S1-100Nm100 N⋅m
73.8 lbf·ft		1-10,00030184 mm
7.24 in		130 mm
5.19 in		66 mm
2.59 in
S2-250Nm250 N⋅m
184.4 lbf·ft		1-8,00030240 mm
9.45 in		150 mm
5.91 in		85 mm
3.35 in
S2-500Nm500 N⋅m
368.8 lbf·ft		1-8,00030240 mm
9.45 in		150 mm
5.91 in		85 mm
3.35 in
S3-1kNm1,000 N⋅m
737.6 lbf·ft		1-6,00030315 mm
12.40 in		150 mm
5.91 in		112 mm
4.41 in
S3-2kNm2,000 N⋅m
1,475.1 lbf·ft		1-6,00030315 mm
12.40 in		150 mm
5.91 in		112 mm
4.41 in
S4-5kNm5,000 N⋅m
3,687.8 lbf·ft		1-5,00015425 mm
16.73 in		150 mm
5.91 in		137 mm
5.39 in
S4-10kNm10,000 N⋅m
7375.7 lbf·ft		1-5,00015425 mm
16.73 in		150 mm
5.91 in		137 mm
5.39 in
S5-15kNm15,000 N⋅m
11,063.4 lbf·ft		1-2,00015416 mm
16.38 in		168 mm
6.61 in		172 mm
6.77 in
S5-20kNm20,000 N⋅m
14,751.2 lbf·ft		1-2,00015416 mm
16.38 in		168 mm
6.61 in		172 mm
6.77 in
S5-25kNm25,000 N⋅m
18,439.1 lbf·ft		1-2,00015416 mm
16.38 in		168 mm
6.61 in		172 mm
6.77 in
S5-30kNm30,000 N⋅m
22,126.9 lbf·ft		1-2,00015416 mm
16.38 in		168 mm
6.61 in		172 mm
6.77 in
*Speak with our team for bespoke requirements.

Downloads

Datum M425 Torque Transducer Datasheet Thumbnail

M425 Torque Transducer: Product Overview Datasheet

Technical overview of the M425 Torque Transducer by Datum Electronics.

1 file(s) 2.51 MB
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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

M425 Torque Transducer by Datum Electronics, as featured in Plextek's case study on Independent Torque Measurement for Back‑to‑Back Motor Controller Testing. Image courtesy of Pletek.

Case Study: Independent Torque Measurement for Back‑to‑Back Motor Controller Testing

Read how specialist technology consultancy Plektek used a Datum M425 Torque Transducer to independently measure torque in back-to-back motor testing for advanced controller development.

1 file(s) 847 KB
Download

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
Download

Image of a Datum M425 Torque Sensor testing Measuring Pump-as-Turbine (PAT) Efficiency in Micro Hydropower (MHP). Image courtesy of Dŵr Uisce and Trinity College Dublin.

Case Study: Measuring Pump-as-Turbine (PAT) Efficiency in Micro Hydropower (MHP) with Torque Sensors

Learn how Dŵr Uisce investigated the use of Pump as Turbine (PAT) as a low cost and low maintenance solution for distributed energy generation within water networks.

1 file(s) 551 KB
Download

case study measuring torque to improve motor performance and efficiency

Case Study: Optimising ROV Motor Control: How Torque Measurement Validates VSD Efficiency Algorithms

Discover how Remove Operated Vehicle (ROV) specialists Sperre AS enhanced the performance and efficiency of their ROV's Variable Speed Drives (VSD) and achieved Maximum Torque per Ampere (MTPA).

1 file(s) 778 KB
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Case Study: Testing Pump Motor Efficiency & Heat Generation

Case Study: Testing Pump Motor Efficiency & Heat Generation

Learn how Kawak Aviation Technologies tested pump motor performance and heat generation using the Datum M425 Torque Sensor. See how accurate power measurement helped optimize helicopter refill systems for aerial firefighting.

1 file(s) 633 KB
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FAQs

  • The M425 Torque Transducer by Datum Electronics delivers ±0.1% accuracy, with non-linearity of ±0.1% FSD and non-repeatability of ±0.05% FSD.

  • The M425 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 M425 Torque Transducer by Datum Electronics is deployed in a wide variety of settings and applications. Popular uses include motor, gearbox, drivetrain, and pump torque testing, R&D and product development, electronic vehicles, research, performance diagnostics and a range of industrial rotating machinery.

  • The M425 Torque Transducer by Datum Electronics can provide digital sample rates from 1-100 samples per second (SPS) with higher rates available on request. Analogue output from 20-100 SPS.

Technical Drawings & CAD Files

Datum Electronics STEP File generic icon

M425 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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M425 Torque Transducer: Technical Drawings

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

1 file(s) 0.00 KB
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