ATF326 Reaction Torque Sensor

Flange Mounted Motor Torque Transducer

About the ATF326 Reaction Torque Sensor

The ATF326 fits between a motor and its mounting structure acting as a low profile coupling or adaptor plate. The motor shaft passes through the centre of the ATF326, the resultant torque reaction on the motor stator is equal and opposite to the shaft torque. Torque is transmitted from the motor stator through the ATF326 transducer to the earth structure or chassis.

This makes the ATF326 suitable for many process applications, examples are:

  • Bulk powder handling - mass flow measurement
  • Rheology - liquid viscosity measurement
  • Mechanical handling - conveyor belt drive torque

ATF326 transducers can be designed for most motor drive applications where the motor itself is static.


Key features ATF326

• Measurement range 0 - 20 Nm
• Non-linearity 0.1 % RT
• Output signal 2.1 mV/V or rationalised 2.0 mV/V ±0.5 %
• Supply voltage 10 VDC, max. 20 VDC


Rated torque
20 Nm
Non-linearity, terminal
±0.1 % RT
±0.4 % RT
Creep, 20 min
±0.1 % AT
±0.05 % RT
Rated output, nominal
2.1 mV/V
Rated output, rationalised
2 mV/V ±0.5 % RT
Zero load output
±4 % RT
Temperature effect on rated output
±0.005 % AT/K
Temperature effect on zero load output
±0.005 % RT/K
Compensated temperature range
-10 - +50 °C
Operating temperature range
-10 - +80 °C
Supply voltage, recommended
10 V
Supply voltage, max.
20 V
Bridge resistance
700 Ohm
Insulation resistance, minimum at 50 VDC
500 MOhm
Structural stiffness
Range dependant
Environmental sealing
Dust proof
Weight (excl. cable)
approx. 8.5 kg
Notes: 1. RT = rated torque 2. AT = applied torque 3. Temperature coefficients apply over the compensated range. 4. The motor mass can create an initial zero change and is replicated during our calibration.
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