How can I measure accurate power in my test rig when there is no room to add an inline transducer?

You can use existing components to become an accurate inline torque transducer, Datum Electronics FF425 transducers are a range of flanged coupling spacer transducers that can replace your existing coupling spacers and give you real time accurate Torque, Speed and Power data from our standard range. Our specialist team can even work with you and the existing spacers that you have and turn these into Torque Transducers. With Datum Connect you can use your smart phone or smart device to wireless view and log accurate Torque, Speed and Power seamlessly.

How can I work out the Torque for my test, I only have the Motor Speed and power?

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`

What if I don’t know my maximum torque measurement load?

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

What is the smallest torque that you can measure?

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.

FF425 Non Contact Flange Torque Sensor

Datum Electronics FF425 Flanged Torque Transducer

Datum Electronics FF425 Torque Transducer S4B 10kNm in Calibration

Datum FF425
High Accuracy Inline Flange-to-Flange Torque Measurement

The FF425 Torque Transducer by Datum Electronics is a fully contactless flange-to-flange torque sensor designed for inline installation in drivetrains and test rigs. With flange couplings at either end it offers seamless integration into existing setups, delivering accurate Torque, RPM, and Shaft Power data across a wide range of applications.

Whether you’re measuring rotary torque in high-speed systems or validating power output in industrial machinery, the Datum FF425 offers a reliable, drop-in solution.

Overview

Flange-mounted motor and drivetrain testing
High-precision torque monitoring in test rigs
Torque validation in production and QA systems
Industrial automation with minimal maintenance
Electric motor and actuator performance analysis
Torque measurement in sealed or clean environments

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Key Features

Benefits

Specifications

Downloads

Technical Drawings & CAD Files

FAQs

Key Features

The Datum FF425 combines a strain-gauged shaft with rotating on-shaft electronics to deliver accurate, contactless torque measurement. Digital signals are transmitted to the stator for clean, reliable data acquisition. With selectable sample rates and high-resolution output, the FF425 is ideal for dynamic testing environments where precision and repeatability are critical.

Its flange-to-flange design allows for easy installation using standard DIN couplings, making it a versatile choice for both OEMs and retrofit projects. The sensor is available in 11 standard torque ranges, with bespoke models reaching up to 16 MNm for heavy-duty applications.

System Features

Accuracy Class 0.1: ±0.1% Non-linearity, ±0.05% Repeatability, ±0.05% Hysteresis
Fully contactless transmission: No mechanical wear or friction
Digital output: RS-485, Wi-Fi, USB, LabVIEW compatible
Selectable analogue outputs: 0–10V, ±10V, 4–20mA, 12±8mA
Sample rate: 1–100 sps standard; up to 1000 sps upgradeable
Environmental protection: IP54 standard; IP67 available for marine use
Operating temperature: –10°C to +70°C
Power supply: 10–24 VDC, 250 mA
High torsional stiffness: Maintains system dynamics under load
Easy integration: Matches standard DIN flange dimensions
Compatible with Datum Link app for iOS, Android, and Windows devices

View FF425 Product Overview Datasheet

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Benefits

The FF425 is a flange-mounted, non-contact torque transducer built for precision and durability in rotary systems. Designed to integrate seamlessly into drivetrains and test rigs using standard DIN couplings, it offers high-resolution torque, speed, and power data without mechanical wear. Its robust telemetry system and selectable output formats make it ideal for dynamic testing, industrial automation, and OEM integration — especially where space, reliability, and repeatability are critical.

Drop-In DIN Compatibility: Easily replaces standard flange couplings for fast installation.
Contactless Operation: Eliminates friction and wear, extending service life and reducing maintenance.
High-Resolution Data: Supports both analogue and digital outputs for flexible integration.
Dynamic Testing Ready: Sample rates up to 1000 sps enable real-time performance analysis.
Environmental Versatility: IP67 option available for marine and sealed environments.
Wide Torque Range: Standard models up to 30 kNm; bespoke options reach 16 MNm.
Compact & Rigid Design: Maintains torsional stiffness for accurate load transmission.
Remote Connectivity: Compatible with Datum Link for wireless data access and logging.
OEM & Retrofit Friendly: Ideal for both new builds and upgrades in industrial systems.

Stockists

Specifications

FF425 Model	Rated Load	Max Rotational Speed (RPM)*	Rotor Mass (kg)	Stator Mass (kg)
S1-100Nm	100 N·m 73.8 lbf·ft	10,000	0.560	1.057

S2A-250Nm	250 N·m 184.4 lbf·ft	10,000	1.201	1.057
S2B-500Nm	500 N·m 368.8 lbf·ft	10,000	1.276	1.057

S3A-1kNm	1,000 N·m 737.6 lbf·ft	10,000	1.668	1.057
S3B-2kNm	2,000 N·m 1,475.1 lbf·ft	10,000	2.149	1.057

S4A-5kNm	5,000 N·m 3,687.8 lbf·ft	8,000	6.112	1.152
S4A-10kNm	10,000 N·m 7,375.7 lbf·ft	8,000	12.162	1.152

S5A-15kNm	15,000 N·m 11,063.4 lbf·ft	6,000	20.499	2.138
S5B-20kNm	20,000 N·m 14,751.2 lbf·ft	6,000	22.318	2.138
S5C-25kNm	25,000 N·m 18,439.1 lbf·ft	6,000	34.608	2.138
S5D-30kNm	30,000 N·m 22,126.9 lbf·ft	6,000	40.969	2.138
*Speak with our team for bespoke requirements.

Downloads

FF425 Flanged Torque Transducer: Product Overview Datasheet

Technical overview of the FF425 Flanged Torque Transducer by Datum Electronics.

1 file(s) 3.36 MB

Download

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

FAQs

How can I measure accurate power in my test rig when there is no room to add an inline transducer?
You can use existing components to become an accurate inline torque transducer, Datum Electronics FF425 transducers are a range of flanged coupling spacer transducers that can replace your existing coupling spacers and give you real time accurate Torque, Speed and Power data from our standard range. Our specialist team can even work with you and the existing spacers that you have and turn these into Torque Transducers. With Datum Connect you can use your smart phone or smart device to wireless view and log accurate Torque, Speed and Power seamlessly.

How can I work out the Torque for my test, I only have the Motor Speed and power?
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`
What if I don’t know my maximum torque measurement load?
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
What is the smallest torque that you can measure?
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.