Description

SGR520 Torque Transducer – Torque Measurement only

SGR521 Torque Transducer – Torque, Speed & Power Measurement (60 pulses per revolution encoder)

SGR522 Torque Transducer – Torque, Speed/Angle & Power Measurement (360 pulses per revolution incremental encoder)

Operating Principles

The SGR series transducers operate using a four-element strain gauge wheatstone bridge, which is connected to a miniature shaft mounted analog to digital converter and microcontroller. The microcontroller conditions and measures the strain gauge bridge output as close to the gauges as possible, eliminating any possible external noise pick up in the gauge wiring.

The shaft mounted electronic module is wirelessly powered by a radio frequency source which drives a stator coil, the output of which is received by a rotor coil on the shaft thus making the system completely contactless. This eliminates the need for slip rings and their associated wear and noise problems.

The shaft microcontroller outputs a digital serial stream that is transferred back from rotor to stator by modulating the impedance of the rotor coil and detecting the impedance changes at the stator coil. A secondary high-performance microcontroller receives the serial stream from the shaft microcontroller, which then performs calibration and temperature compensation before outputting the results digitally via RS232, CAN bus or USB. A 16-bit digital to analog converter also outputs the sensors data as a fully calibrated and compensated analog voltage or current.

Key Benefits

• Transducer range from 175mNm through to 13,000Nm
• 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 4,000 samples per second
• Speed measurements/Angle/Power computation
• Wide Power Supply range 12-32vDC
• Optional integrated Ethernet allows a transducer to be accessed by multiple users simultaneously, from anywhere on the connected network

TorqSense SGR52x Series transducers offer:

• Digital outputs such as RS232, CANbus, USB and Ethernet for interfacing with modern instrumentation and laptops
• Digital input for configuring transducer via PC
• BIT Self-diagnostics for letting users know data is trustworthy, that the transducer torque or speed ratings have not been exceeded and the transducer’s calibration date
• Transducer configuration software to allow user to changes transducer variables
• 3 analog channels are individually configurable, allowing changes to scaling and data assignment
• Sensors to monitor shaft temperature for better compensation and accuracy
• Simple ‘Sensor Status’ output pin
• Ability to connect up to 10 transducers using USB
• Optional integrated Ethernet provides distributed access and multiple simultaneous user/device use.
• Transducer status LED and simple ‘Sensor Status’ output pin, provides transducer health feedback.

Torque ranges available at any full scale torque: 1Nm to 13,000Nm, with above 13,000Nm on request.

First Annual Re-calibration is included in the purchase price. Units must be returned to Omni Instruments for Re-calibration