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Model 501 Fluid Bed Dryer


By forcing enough air through a bed of particles, the particle bed may assume a fluid-like state (resembling a boiling liquid). Heating the incoming air and managing air flow rate through the sample, the Model 501 Fluid Bed Dryer provides thorough mixing and maximum contact of solid with moving air.

The result - a process producing more even and much quicker drying than conventional methods


Delivering up to 2.5m3 per minute of air, the Model 501 Fluid Bed Dryer can break up wet samples and ensure vigorous mixing and rapid moisture removal.
5kg of wet "ideal" sample (80% moisture) can be dried in 15-20 minutes (5 Litre tub)


Air separated particles prevents lumps and caking, both of which make other drying processes much slower.MILD High air flow rate gives:

  • high moisture removal rates at relatively low temperatures
  • thorough mixing, so no wet spots requiring extra thermal energy to penetrate
  • an air cushion between particles to reduce abrasion and particle size alteration


Static drying methods leave evaporation residues at the sample surface giving a heterogeneous sample. Fluid Bed Drying achieves the opposite. Mixing during Fluid Bed Drying gives homogeneous samples, making an ideal method of representative sample preparation for subsequent material analyses.


Microprocessor control of air flow, inlet air temperature and drying period coupled with fluid bed action gives highly reproducible experiments and finished samples. After preliminary experiments, a known moisture content in the final sample (ideal for tablet forming) or removal of external (surface) moisture only, may be achieved. Drying times to required moisture content may be optimised and drying patterns studied to aid scale-up and plant design.
Without a PC connected the Model 501 Fluid Bed Dryer can run one stored program of up to 16 steps (previously downloaded from a PC), or may be used as a conventional (manually controlled) Fluid Bed Dryer. Additional features of this advanced in-lab dryer technology include:

  • Precise air flow feed-back control
  • Membrane sealed controls to prevent ingress of particles into the instrument
  • Reduced operating noise

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