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The following guide has been prepared to help you get your fluidised bath back into service as soon as
possible, should a fault develop. If in doubt, please return the unit to the manufacturers for servicing.
Please refer to the next section for dismantling procedure.
Fault
Sand Bed will not fluidise
1
a Air lines blocked
b Incorrect air supply
c Filters blocked or leaking
d Control valves not working correctly
e Bed material damp
2
Bed 'boiling' erratically in one spot
a Porous plate cracked
Bath not heating
3
a Incorrect electrical supply
b Energy regulator not
FauLt FInDIng
action required
Check all air lines and connections for leaks or
restrictions.
Check air supply for correct pressure 21 kN/m
(3 lb/in
2
) and adequate flow (up to 57 l/min)
3
(2ft
/min).
Check all filters for leaks or restrictions.
Check functioning of all regulators
or control valves in the air line.
If the bed material has become damp due
to spillage of liquid, etc., then empty the bath
immediately. Blow air through the porous plate
to remove all moisture and dry the bath material
by other means before replacing it in the bath.
DO NOT ATTEMPT TO DRY OUT REALLY
DAMP MATERIAL IN THE BATH ITSELF.
Check porous plate or its seal for cracks or
leaks. Replace porous plate if damaged.
Check supply (220/250 volts, 50/60Hz or
110/125 volts, 50/60Hz) and all external
connections.
Connect an ammeter (range up to 15 amps
functioning a.c.) into the mains lead:-
adjust the heater switch to the LOW position.
Fluidise the bed and by switching the energy
regulator to a reading of 5, observe that current
flow alternates from 0 to approx. 4.3 amps.
If no current flows at all then check items c to f
and then if necessary replace the regulator.
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