Low torque performance not previously obtained in commercial rheometers...the AR-G2 from TA Instruments

摘要

TA Instruments new rheometer,the AR-G2,was launched in February 2005.For this instrument we have introduced two features that combine to provide a low torque performance never previously obtainable on a commercial rheometer.The AR-G2 is a combined motor and transducer(CMT)instrument,with controlled stress measurements as its native mode.The lower component of the measuring system is fixed,the upper component is attached to a shaft,that can be rotated by a torque produced by an induction motor.The constraint on the low torque performance of such an instrument is the friction between the rotating and the stationary components.