Maintenance; Maintenance Procedures For Pvc Etc - Techne IFB-201 Bedienungsanleitung

1) The aluminium oxide fluidising medium, not being degradable, will only require replacement when
losses occur due to attrition and spillage, or contamination with inert pigments, fillers or acidic by
products from the cleaning process. Fluidising medium lost through entrainment in the exhaust may
be collected in a cyclone trap.
Should the fluidised bath be stored for long periods of time under damp or humid conditions,
moisture may be absorbed by the alumina which is hydroscopic. To avoid violent fluidisation which
occurs when damp alumina is heated above 100°C, operate the bath for a period of approximately
8 hours at 90°C prior to operation at elevated temperatures.
NEVER ADD COLD OR DAMP ALUMINA TO A HOT BATH AS THIS WILL ALSO CAUSE VIOLENT
FLUIDISATION WHICH CAN BE DANGEROUS.
Allow the bath to cool then add the fresh alumina. If this fresh alumina is a large proportion of the
charge then dry the whole charge as above.
2) On a daily basis at least, the bed should be cleaned of floating residues by means of a wire mesh
hand scoop. This procedure removes carbon char which impairs fluidisation and acts as an
absorbent.
3) The air line filter supplied with the fluidised bath is self draining. However, it should be kept in good
condition by inspection at two weekly intervals and by cleaning the bowls and washing or replacing
the filter elements as necessary. With exceptionally dirty or wet air supplies this frequency may have
to be increased. Free water or water vapour in the air supply is a notorious source for the production
of hydrochloric acid in the bed when PVC is being processed.
B13 regulator Filters
On automatic-drain models no adjustments are necessary. Clean filter element and automatic-drain
protective screen regularly. If required automatic-drain models can be manually tripped by pushing
a blunt ended rod up through the bottom of the mechanism to completely purge the bowl.
To remove the filter element shut off the air supply (bleed off pressure from unit unless exhaust type
Shut-Off Valve fitted) and unplug filter from the Unidaptor. Replace with standby unit and service
filter at workbench.
Unscrew the bowl anti-clockwise, unscrew the baffle from the stacked rod and withdraw the
element, gasket, louvre and 'O' ring.
Wash element in paraffin and blow out thoroughly with compressed air. Clean plastic bowl in SOAPY
WATER.
The filter element 6009248, may be replaced if heavily contaminated.
F51 Filters
Unscrew bowl, complete with gasket/'O' ring, and the main element by hand. Remove prefilter
element. On F51 models this pre-filter element is retained by a nut and incorporates a spacer. Partial
cleaning of the pre-filter element can be achieved by washing in warm water and detergent, and
drying with compressed air - renew if heavily contaminated. Fit new main element gasket/ 'O' ring
and replace main element and pre-filter element. The main element 6009247 may need renewing
after two years service or if pressure drop becomes excessive. It is not designed to be cleaned.
In addition, oil vapours in the air supply which reach the porous plate are carbonised within the
pores of the plate, quickly causing blockage and consequent poor fluidisation, local overheating,
premature heater failure and possible distortion of the inner container.

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