The Classifier Assembly allows you to take a sample, remove fines, and classify
your product by the Stokes' parameters of size, shape, and density (moisture).
With vigorous mixing by air flow, opening the valve on the sampler takes a
representative sample in seconds without interrupting the drying process. By
gradually increasing the air flow rate, the operator can selectively remove fines
or the sample which is the first to dry out, since it is less dense.
The Sampler serves as an effective classifier with samples having a broad range
of particle size or bi-modal distribution. It is best to dry the sample before trying to classify.
Mini-Glass Tubs made to fit our Multi-Tub Assembly holds 250 millilitres of
sample and uses a conventional mini-filter bag.
A Multi-Tub Assembly holds four Mini-tubs which are dried simultaneously on the
Fluid Bed Dryer. This is particularly useful for drying 4 samples for further
analysis of particle size, chemical constituents, or for evaluation by tasting
or olfactory panels. Choice of filter bags include:
Nylon - resistant to alkali vapours.
Terylene - resistant to acidic vapours
Polypropylene - chemically resistant to both vapours, but is designed for prolonged
use only, at drying temperatures under 100oC.
Sealed Tub Assemblies are now available in 5 Ltr and 250 millilitre Glass-Tubs.
Samples having a wide (or bi-modal) distribution of particles are difficult to
fluidise without getting some overflow of sample into the filter bag.
Using a Sealed Tub Assembly, the top filter plate seals on a silicon '0' ring,
retaining the sample in the tub. By selecting 5 micron inlet and outlet filters,
we are now able to fluidise and dry down to 5 micron size particles. The filter
size must be specified on ordering to ensure maximum drying capacity.
A Pulse Flow Device can now only be incorporated on the M501 Fluid Bed Dryer
With a PFD you are able to pulse air into the sample and adjust the frequency of
pulsing as well as the duration of alternating between pulsed and normal
continuous flow. Pulsing the flow has been found analogous to providing
external shaking and mixing. Samples which are difficult to fluidise, like long
wet strands of irregular shaped leaves of tobacco or tea are "blown apart" and
mixed by pulsing the flow.
The Sieve Drying Assembly is made to fit the analogue or digital Fluid Bed
Dryer. Single or multiple stacked sieves having a diameter of 8 inches (or 200
mm) can be placed on the dryer and dried within 15 minutes.
Specials ...... Routine "Specials" include putting inlets for thermocouples into 5
litre glass tubs or inlets to accommodate a spray head for coating samples. We
are always receptive to solving problems presented by new applications.
