At Stand 5-345, Anton Paar is introducing the MCR 702 with modular TwinDrive^™ technology - the first rheometer to cover all rheological applications. The rheometer has an accuracy of 1 nNm and features like the IsoLign Piezo flange, offering measuring gap control down to an unprecedented size of 10 nm. The company’s TwinDrive technology combines two powerful synchronous EC (electrically commutated) motor units in a modular setup: the upper EC motor in the rheometer is permanent; the lower EC motor can be extracted and integrated at will. Due to the EC motor's renowned dynamism and precision, users have several options of how to employ these motor units to fit their specific requirements. MCR 702 can be operated in several test modes.

2EC Mode

In this mode, the rheometer employs both EC motors as drive units and torque transducers, optionally rotating in opposite or parallel directions. Doubled EC motors extend the scope of testing options, e.g. with optional counter-rotation for enhanced rheo-microscopy. MCR 702 TwinDrive can be operated with both motors’ maximum shear rates combined and is optionally employed for extensional rheology applications or tests with parallel rotation at different speeds. The 2EC mode also enables users to employ the motors in a more synchronized fashion, making “different demands” on each of them. Because of the EC motors’ outstanding precision, one motor is easily brought to a standstill and operated solely as a torque transducer, while the other motor is used as a drive unit only.

EC Mode

In the EC mode, the lower motor unit is easily removed in accordance with individual application needs. This procedure is fully supported by ToolmasterTM, the MCR’s automatic tool recognition and configuration system. After the extraction of the lower motor, the instrument can be operated as a single-drive rheometer, making the most of the single EC motor’s TruStrainTM capability and enabling “classic” stress-controlled tests. The EC mode opens MCR 702 up to the wide variety of custom-tailored temperature devices and application-specific accessories the MCR series is known for.