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Rotork Controls uses Torqsense transducers from Sensor Technology for the performance testing of its valve actuators, which are used in applications within power generation, water and sewage, industrial processes, subsea, marine, HVAC, incinerators and cement plants.

Sensor Technology supplies Rotork Controls with its Torqsense transducers for the performance testing of its valve actuators, which are built around motorised gearboxes.

Rotork, manufactures a range of electric, pneumatic and hydraulic valve actuators and control systems, valve gearboxes and valve accessories, which can be used under extremes of temperature. Due to the high cost of downtime, testing to ensure reliability is highly important.

The non-contact transducers operate using surface acoustic wave principles — an alternating current passed across the terminals produces surface waves that are then converted into an electric signal by a receiving array.

Key benefits of product application

  • As the sensor can provide digital and analogue outputs, one output can be used to verify the other.
  • Additionally, each output can be used to perform a separate test.

Sensor Technology

Sensor Technology are manufacturers of TORQSENSE Transducers, the world’s first low cost non-contact rotary torque transducers designed for OEM applications. Rotary torque measurement has always been difficult and expensive.

The patented method uses a surface acoustic wave device as a frequency dependent strain gauge and measures the change in resonant frequency caused by the applied strain in the shaft.

The signal is transmitted via an RF couple from the rotating shaft to a fixed pick-up.

By using a frequency-based device, the signal bandwidth is increased, and the problem of electronic interference common with analogue signals is eliminated. The torque sensors are designed to operate direct from a PLC or a PC.

They require minimum length of shaft, have low inertia, no physical contact between shaft and housing, wide bandwidth, high resolution and accuracy resolution to better than one part in a million, and excellent noise immunity.

The technology lends itself to design of OEM transducers for specific customer applications. Applications include automotive, manufacturing machines, condition monitoring where knowledge of torque is critical, torque control of tightening procedures, and monitoring of viscosity during mixing where consistency is required. The technology replaces existing types of rotary torque sensors by providing better performance at a lower price.

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