MYTOS
TWISTER

Particle sizing in real-time with laser diffraction for dry and even cohesive powders ranging from 0.25 µm to 1,750 µm in the process line

Together with the representative sampler TWISTER, the laser diffraction sensor MYTOS forms a complete, perfectly coordinated and robust in-line process analysis system, which is directly integrated in the process line. Thanks to the use of the integrated RODOS dry dispersion, even finest, cohesive or magnetic powders can be reliably dispersed and measured. The interplay between sampling, dispersion and laser diffraction sensing enables continuous real-time analyses of dry powders and granules with particle sizes ranging from 0.25 µm to 1,750 µm in process lines with diameters from 80 mm to 200 mm and mass flow rates from 1 kg/h to over 100 t/h. The representative, continuous recording of measured values under process conditions enables integrated quality inspection and optimised process control.

For reliable in-line particle size analysis, representative and continuous sampling is just as much a prerequisite as the full dispersion of the primary particles. The dynamic sampler TWISTER scans the entire pipe cross-section on a spiral path and ensures that all regions are sampled with equal weighting. The representative subsample is dispersed with compressed air in the downstream RODOS injector and measured in the measuring zone of the MYTOS laser diffraction system in the free aerosol jet. The sample material is then fed back to the product stream in the process line. The information gained in real-time about the particle size distribution can be provided via standard communication interfaces to a process control system for process monitoring or for process control.

In order to adjust the sampling to the product and to the process conditions, calibres of 4 mm, 6 mm and 10 mm are available for the sampling tip and for the dispersing line. The mechanical system of the TWISTER is fully encapsulated against the product stream, so no particles come into contact with moving parts or gaskets. Since the sample never leaves the process line, it is also possible to measure highly reactive or potentially explosive products and toxic substances under a protective atmosphere. For cleaning of the sampler and the dispersing line, an integrated blow-back device can be used optionally after every measurement. In addition, sheath flow and air purge ensure that the optical components are kept clean. The measuring system is virtually maintenance-free as a result. Regular reference measurements and the autofocusing of the detector combine to provide a system that is always ready to perform.

The system can be switched into standby mode, in which it is hermetically sealed against the process and against unnecessary particle ingress. This means that the optical components can easily be cleaned without downtime, if required.