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MCR 702 TwinDrive: High Performance in CMT, SMT and Counter Rotation

Relevant for: MCR 702 TwinDrive

Introduction

Low torque measurements on rotational rheometers have always been challenging as the instrument is pushed to its limits during these tests. In the past, the minimum torque resolution has been an intrinsic limit of the instrument due to the residual friction of the bearing. In today’s rheometer generation the technology has improved significantly that environmental factors surrounding the instrument like open windows, running ACs, people traffic in and around the lab or changing temperature conditions cause only smallest disturbances which are measured by the rheometer and influence the low torque performance.

Quiet and temperature stable conditions are therefore required once the instrument should be pushed to its limits. A snow flake landing on the tip of a stretched arm produces a torque at the shoulder of about 4 nNm. In comparison to the sensitivity of a state-of-the-art rheometer such as the MCR 702 this is four times higher for example.

Another important factor in low torque measurements is the averaging used for data point generation or the potential averaging of several measured curves. To verify the low torque performance of MCR rheometers, measurement durations as the may occur in the laboratory were chosen. Therefore typical measurements do not last longer than one hour and data point averaging is also chosen in a reasonable time window. Averaging of several measurements is not allowed as internal standard when displaying performance data.

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