Electronic dynamometer

TGA/DSC Delaminations Contamination Dispersion Dynamometer tests SAE J661, FAST, full scale Chemical composition as needed Pyrolytic gas chromatography Infrared analysis X-ray diffraction TGA/DSC Electron microprobe analysis (EMPA) SEM... 

Parameters such as impeller speed and shaft power (in a stirred bioreactor) and fluid velocity are indicators of the degree of mixing and thus play an important role in the control of mass transfer. Impeller speed is easily monitored with a tachometer (electronic or mechanical) [39], but the measurement of shaft power input is not as straightforward. The most common method utilizes a torsion dynamometer attached to the impeller drive however, this technique includes losses due to friction in the drive shaft. Better data can be obtained from balanced strain gauges mounted on the impeller [37]. On-line measurement of the liquid velocity in a flowing or stirred system can be obtained by a heat-pulse method in which a resistance thermometer is used to measure a brief temperature increase caused by an upstream pair of electrodes [43]. Use of this sensor system has been limited to laboratory applications. 

In the newly developed units, the dynamometer is mounted together with the high-precision electronic torque-measuring unit on a stable and distortion-free base plate. The torque of the linear dynamometer is measured directly using a load cell without any intermediate member, thereby increasing the overall reliability of the torque rheometer. 

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