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| STEP®-Technology and Measuring principle | ||||
| Demixing phenomena, like
sedimentation, flotation or consolidation are directly measured by
the LUMiReader®, LUMiFuge® or LUMiSizer®
due to the patented cutting-edge STEP®-Technology.
This permits to obtain Space- and Time-resolved Extinction Profiles over the entire sample length of up to 12 different samples simultaneously. Parallel light (I0) illuminates the entire sample cell and the transmitted light I is detected by thousands of sensors arranged linearly across your whole sample from top to bottom with a microscale resolution. Transmission is converted into extinction by lg I/I0 and particle concentration may be calculated. The unique STEP®-Technology gives high flexibility to use different cells to match specific sample properties. |
 Measurement scheme of the multisample analytical photocentrifuge and principle of STEP®-Technology. (to see full size, click on the image) |
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| By means of the comprehensive
database based PC-software SEPView
the light intensity can be adjusted to the corresponding sample turbidity.
Transmission profils are recorded as fast as each second or with time
intervalls up to hours, displayed as a sequence on the screen. Transmission date are automatically stored in a special designed database, together with all instrument settings and actual calibration data. The speed of the centrifuge can be set at a constant value or programmed to change during the measurement in the range from 200 rpm to 4000 rpm. These rpm-values correspond to relative centrifugal forces (RCF) at the bottom of the cell of 5 to 2300 (RCF = centrifugal acceleration/earth gravity). Built-in temperature control covers all present and future applications. |
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| Evaluation Features: The
evolution of the transmission profiles contains the complete information
on the kinetics of any concentration changes due to creaming, sedimentation,
flocculation, coalescence or phase separation. Based on these space- and time-resolved extinction profiles (STEP®-Technology) demixing phenomena are quantified regarding clarification velocity, sedimentation and flotation velocity of particles, residual turbidity, separated phase volume (liquid or solid), sediment consolidation or dewaterability. Furthermore, comprehensive infomation is obtained with respect to the multimodality or polydispersity of dispersed particles. |
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