Discovery Hybrid Rheometer
The Discovery Hybrid Rheometer (DHR) features powerful new technologies from the world leader in rheological measurements. Our new hybrid technology combines a patented magnetic bearing, drag cup motor, force rebalance transducer (FRT), new patent-pending optical encoder dual-reader, and True Position Sensor (TPS) into a single-head rheometer.
The DHR has improved every performance specification and delivers unrivaled true strain, strain rate, stress control, and normal force accuracy. The DHR also features our most popular TA innovations including patented Smart Swap™ geometries and Smart Swap™ temperature systems.
The next Generation of strain measurements
Optical Encoder Dual-ReaderAll DHR systems feature optical encoders for high resolution displacement measurements. The HR-3 features a patent-pending optical encoder with dual reader. This new technology provides ultra high displacement resolution of two nanoradians, reduces noise, and enhances phase angle measurements. The benefit is better data and higher sensitivity when running challenging materials over a range of conditions, or even extreme conditions.
Normal Force Rebalance Transducer (FRT)
The TA Instruments ARES-G2 force rebalance technology has long been the industry standard for normal force measurements. This FRT technology is now part of the Discovery Hybrid Rheometer. Competitive strain gauge and capacitive sensors rely on physical movement of the device to sense a force. This can result in measurement error. An FRT provides the most accurate normal force measurement because the linear motor is driven to maintain zero deflection.
Second Generation Magnetic Thrust Bearing
The DHR is the only commercial rheometer with a magnetic thrust bearing and our second generation patented design offers improved low torque performance and mapping stability. The low-end torque performance of any rheometer depends on bearing friction which results in residual torques. The DHR magnetic bearing has a gap 250 times larger than competitive air-bearing designs, and thus no drag from pressurized air flow. The result is 70% less friction enabling the DHR motor to measure 0.5 nN.m of torque. The magnetic bearing design is inherently robust and not susceptible to contamination. (Patent #’s 7, 137, 290 and 7, 017, 393)
New True Position Sensor (TPS)
The DHR includes a patent-pending True Position Sensor (TPS) for true gap accuracy. The TPS is a high resolution linear position sensor that ensures the most accurate data, by measuring and compensating for the effects of thermal expansion, in real time. Unlike competitive devices, the TPS eliminates thermal expansion errors without the need for special high inertia iron core geometries and environmental systems.The TPS works with all Smart Swap™ geometries and Smart Swap™ environmental systems.