Reaction Torque Sensor

Model 12328
Model 12328

It is often the case that torque in a rotating shaft can be measured with a stationary, reaction torque sensor at some point in the powertrain. This is due to the existence of an equal and opposite force (torque) necessary to hold the drive and driven equipment in place.

Model 15228
Model 15228

For example, the torque to drive a pump at a constant speed can be measured as the static torque necessary to hold the pump or the motor from rotating (Model 15228). The reaction torque approach is often less costly and because reaction torque sensors have no moving parts, requires no maintenance. Reaction torque sensors are recommended in lieu of rotary torque sensors when steady-state measurements are acceptable.

Teledyne LeCroy Test Services (TLTS) offers a complete line of Reaction Torque Sensors in capacities from 10 in-lb to 250,000 in-lb. All of our sensors utilize strain gages and are maintenance free with no moving parts. Reaction Sensors are used in applications where in-line torque measurements are required and angular motion is limited.


The low-profile HD-REAC series is used in dynamometer applications where axial space is limited and heavy overhung loads are present. These sensors are extremely accurate and temperature stable and come standard with precision male and female pilot diameters to ensure concentric alignment of the dynamometer components. Each unit can be configured with holes or studs on the mating faces per customer requirement. The inner cover is sealed to allow for lubricant flow and options are available to port lubricant through the body of the sensor as required. The HD-REAC series is interchangeable with Honeywell Lebow 2320 series (2320-2K, 2320-5K, 2320-12K, 2320-24K, 2320-36K and 2320-48K).

Mixers -- Dynamometers -- Pumps -- Motors -- Research & Development


Output at Rated Torque 1.5 to 3 mV/V nominal
Calibration Accuracy 0.25% F.S.
Overload Rating 150%
Excitation Maximum dc to 10V
Bridge Resistance 350 ohms
Zero Balance 1% F.S.
Temperature Effect on Zero 0.0025%
Compensated Temperature Range 72°F - 150°F +/- 3°F
Connector MS 3110P-8-4P or equivalent