The Kitorq sensor family by Kistler Instruments (Switzerland) has been extended by devices ranging 100, 200, and 5 000 Nm. The stator part is optionally available with a CANopen interface transmitting the measurements to other devices. The sensors feature an accuracy class of 0,05 %.
THE TORQUE-MEASURING UNITS COMPRISE a rotor and a stator part. Besides the recently introduced measurement ranges, the Swiss company offers sensors for 500, 1 000, 2 000, and 3 000 Nm. The sensors are designed for test benches for internal combustion engines, electric motors, transmissions, and drive trains. A speed measurement of 60 pulses per revolution is integrated in the standard system. The rotors of different sizes can be combined with the same ring-less stator, which allows different items to be tested without the complete reconstruction of the test stand. This minimizes also hardware investment as one stator may be used with rotors of differing ranges for different applications. According to the provider, the ring-less stator design speeds up the installation, protects against damage during assembly operations and facilitates visual observation during the test process.
The stator comes with an optional CANopen interface. When needed, the rotor's original measuring range may be overridden to allow the full output signal to be available over a defined range. A second, freely selectable measuring range may also be defined at each output. The lack of an antenna ring has not reduced the precision of the sensor, which has an excellent signal bandwidth of 10 kHz and accuracy of better than 0,05 %.
The solid measuring flange is robust and has been tested to EN 60068-2-27 for mechanical shock, EN 60068-2-6 for triaxial vibration loading and EN 61326-1 for interference immunity. The torque measurement system is supplied with the Sensortool configuration and diagnostic software, and calibration certificates. Several calibration options are available for the configurable output signal. When replacing an individual rotor or stator, the notional calibration values are calculated to avoid a recalibration by the manufacturer.
Established in Winterthur (Switzerland) in 1957, the Kistler Group now has a worldwide presence with 25 group companies and 30 distributors. With a staff of more than 1200, the company claims to be one of the world's leading providers of dynamic measuring instrumentation with a turnover of 235 million Swiss Francs in the 2011 financial year. Company’s core competence is the development, production and use of sensors for measuring pressure, force and acceleration. Investments in research and development (15 % of staff worldwide) have generated a number of innovations using piezoelectric, piezoresistive and capacitive techniques to provide solutions to force, pressure and acceleration measuring problems. These innovations include the world's first commercial quartz sensor, two-wire constant current technology to integrate sensors with microelectronic circuitry, high-temperature pressure sensors for use up to 400 °C, and three-component force measuring sensors.
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