FF425 Non Contact Flange Torque Sensor

Contactless Torque Transducers with flange couplings at either end with measuring ranges from 0-100Nm up to 30kNm as standard (bespoke sensors up to 16MNm) for a variety of in line static and rotary torque measurement applications.

Series FF425 Non Contact Flange Torque Sensors and Series FF410 Static/Reaction Torque Sensor

The Datum Electronics Series FF425 non contact flange torque sensor and FF410 torque sensors have been designed to fit easily inline with any drive train or test rig using standard DIN size couplings. With Flange couplings at either end of the torque transducer, it has many advantages over other torque measurement systems on the market.

FF-425-Torque-Transducer-Range-Flange to Flange Torque Sensors
FF425 Torque Sensor 200Nm                                
FF425 Torque Transducer 10000Nm                               FF425 Torque Sensor 60000Nm  

The FF425 rotary torque transducer utilises a strain gauged shaft for accurate and reliable torque measurement and a set of rotating on shaft conditioning electronics. The digital signals are transmitted to the non-rotating part of the system or stator providing a reliable and highly accurate torque measurement solution.

Using our revolutionary new electronics as used in our industry standard, our M425 inline rotary torque sensor,  the FF425 gives customers higher resolution with up to 24bit resolution and the ability to choose their sample rates from 1 up to 4000sps.

FF425 Flange Torque Sensor Features

The FF425 non-contact rotary flange to flange torque sensor has 11 standard torque ranges. The torque sensor offers very high accuracy, operational stability, high signal resolution and wide range of signal outputs across the whole range of torque from 0-100Nm and up to 30,000Nm.

  • Fully Non-Contact Transmission and Hardware
  • Accuracy: 0.1%
  • Non-Linearity: 0.1%
  • Repeatability: 0.05%
  • Sample Rate: 1 to 4000 samples per second
  • Serial Torque Outputs: SCADA outputs, including RS485, RS232, Ethernet, Modbus UPD, USB Logging
  • Analogue Torque Outputs: 4-20mA configured 4-20mA (4-12-20mA): +/-10Vdc, +/-5Vdc, 0-10Vdc or 0-5Vdc
  • Operating Range: -10 to +70˚C
  • Environmental Protection: IP54 (see RS425 Torque Sensor for IP67/68)
  • Power Supply: 10-24Vdc 250mA


I just wanted to thank you for the excellent service. The torque flange has arrived to our facility. If I could get such service and lead times from the rest of the supply chain, it would make life easier.

Benjamin, Dolphin N2

FF425 Non Contact Torque Sensor Range


FF425 Torque Sensor Measurement Range
Torque Sensor Size12345
Torque Sensor Range: A 0-100Nm0-250Nm0-1,000Nm0-5,000Nm15,000Nm
Torque Sensor Range: B0-500Nm0-2,000Nm0-10,000Nm20,000Nm
Torque Sensor Range: C 0-25,000Nm
Torque Sensor Range: D 0-30,000Nm
Max Shaft Speed (rpm)0-10,0000-10,0000-10,0000-8,0000-6,000

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The FF410 Static/Reaction Torque Sensor Range

If you’re looking to measure static torque? Then the Datum Electronics Series FF410 Reaction torque sensor with standard DIN flanges will be an ideal and cost-effective choice. This static torque sensor was based on our FF425 series of rotary torque transducers and is used to measure torque with no rotation or angular acceleration. As in the FF425 Flange to Flange Torque Sensor range, FF410 Reaction transducer design uses the same basic shaft components and cutting-edge strain gauge technology, allowing us to keep the reaction torque transducer competitively priced with a high torsional stiffness included.

Easy Fit into Drive Train

The 410 Static Non-Contact Torque Transducer and FF425 Flange to Flange Rotational Torque Sensors easily fit into your existing test rig, test bench or drive train. Using standard DIN flanges, fitting and coupling, the FF 425 dynamic torque sensors and FF110 static torque transducers are made more efficient than other options available. The minimum operating envelope of the Datum flange to flange torque meters starts from 100mm and will increase depending upon torque measurement requirements.


Contact Team

      FF425 Rotary Torque Transducer Datasheet
      FF425 Flanged Torque Sensor User Guide

      FF425 Non-Contact Flange Torque Sensor Dimensions


      Torque Sensor SizeRated Load
      Rated Load
      (lb ft)
      Speed (RPM)
      Shaft Length Face to FaceBody WidthFlange
      Male/Female Flange Coupling extrusion/
      flange coupling
      Ø H7/
      h6 TOL (mm)
      (ISO 286)
      Flange ThicknessBase lengthOverall
      fixing slot.
      to centre
      Size 10-1000-1000-10,00097.5501002.5578220143.5188
      Size 2 – A0-2500-2000-10,00097.5501002.5578220143.5188
      Size 2 – B0-5000-4000-10,00097.5501002.5578220143.5188
      Size 3 – A0-1,0000-7500-10,00097.5501202.5758220143.5188
      Size 3 – B0-2,0000-1,5000-10,000107.5501202.5758220143.5188
      Size 4 – A0-5,0000-4,0000-8,00013750180311012220172.5188
      Size 4 – B0-10,0000-8,0000-8,00015760185311015220172.5188
      Size 5 – A0-15,0000-12,0000-6,000216602505.514020300212.5266
      Size 5 – B0-20,0000-15,0000-6,000216602505.514020300212.5266
      Size 5 – C0-25,0000-20,0000-6,00021660285617520300212.5266
      Size 5 – D0-30,0000-25,0000-6,00021660315619022300212.5266

      *For more information please refer to the FF425 Torque Transducer Datasheet in the Technical Documentation section.

      FF425 Torque Sensor Size1 STEP Drawing
      FF425 Torque Sensor Size 2A STEP Drawing
      FF425 Torque Sensor Size 2B STEP Drawing
      FF425 Torque Sensor Size 3A STEP Drawing
      FF425 Torque Sensor Size 4A STEP Drawing
      FF425 Torque Sensor Size 4B STEP Drawing



      • Datum HQ Headquarters
      • Castle Street
      • East Cowes
      • United Kingdom
      • PO32 6EZ
      • +44 (0) 1983 28 28 34


      FF425 Rotary Torque Transducer Datasheet
      FF425 Flanged Torque Sensor User Guide


      • High accuracy with up to 24bit resolution
      • Selectable sample rates up to 4000sps
      • Rotary Speeds up to 20,000rpm
      • Matches standard DIN Flanges
      • Ideal design for easy fitting
      • High torsional stiffness model
      • Standard range from 250Nm-10,000Nm
      • Bespoke Range to 20 MNm
      • Analogue Output available
      • Compatible with LABVIEW software
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