SGR520/521/522 Advanced Digital Rotary Torque Transducer

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Key features

• Transducers from 175mNm to 13000 Nm.
• Large fully functional overrange capability of 250%
• Minimal side and end load errors
• Low linearity deviation of ± 0.05 % FSD
• Low hysteresis error of ± 0.05 % FSD
• Zero variation in torque signal with rotation (cyclic variation)
• Non contact signal transmission, no slip rings to wear out
• High digital sample rate of 4000 samples per second
• Adjustable torque data smoothness, low pass filter
• Speed measurement / Angle / Power computation
• Wide power supply range 12-32 VDC
• Optional integrated Ethernet allows a transducer to beaccessed by multiple users simultaneously, from anywhere the connected network reaches.

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About the SGR Advanced Digital Rotary Torque Transducer

Torqsense Digital rotary strain gaug series (SGR) Transducers use non contact technology eliminating the need for noisy slip rings. They are suitable for torque measuring, testing, feedback control of drive mechanisms and process control applications.

The SGR series transducers use modern strain gauge
signal conditioning techniques to provide a high bandwidth
low cost torque measuring solution with high
overrange and overload capabilities.

TorqSense SGR520/521/522 transducers offer:

• SGR520 - Torque measurement only
• SGR521 - Torque, speed & power measurement
  (60 pulses per revolution encoder)
• SGR522 - Torque, speed/angle & power measurement (360 pulses per revolution incremental encodr)
  
• BIT Self-diagnostics - Diagnostic system checks internal
  systems and operational conditions for faults,
  and monitors torque, speed and temperature for
  overscale conditions.
• Transducer status LED and simple “Sensor status” output pin, provide transducer health feedback.
• Sensors to monitor shaft temperature for better compensation and accuracy.
• Digital outputs - RS232 and USB (standard), CAN
  Bus and Ethernet (optional).
• Transducer Control configuration software is provided
  to setup and configure the transducer.
• 3 analog channels are individually configurable, allowing changes to scaling and data assignment
• Ability to connect up to 10 transducers using USB.
  
• Optional integrated Ethernet provides distributed
  access and multiple simultaneous user/device use.

Technology

The SGR series torque transducers use a full four element
strain gauge bridge to measure the torsion present on a shaft. The full bridge helps to diminish errors from any off-axis forces that are sometimes unintentionally applied to the transducer in some test setups. The full bridge also increases the sensitivity and the temperature performance of strain measurement.

A rotor mounted ultra-miniature microcontroller measures the strain gauge bridge and transfers the information back to the stator digitally eliminating any noise pickup usually associated with slip ring and other analog methods of transferring torque data from rotor to stator. External noise pickup into the gauge wiring is virtually eliminated due to the short distance between the strain gauge elements and the rotors measuring circuits.

A multipoint calibration method reduces any linearity errors within the sensor. A large functional overrange capability allows the peaks of a torque signal to be captured more faithfully without any clipping when operating the sensor close to its full scale rating.

All this combined with a mechanical overload capability of over 400% make the SGR series torque sensors a very robust and accurate torque measuring solution.

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