Techne IFB-131, Operator'S Manual

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I F B - 1 3 1 O P E R A T O R ’ S M A N U A L
PAGE 16
OPERATION
To set the temperature controller to the required operating temperature, switch on
the electrical supply which will illuminate the power and cut-out indicators. Then set the
required temperature by using the up and down arrows. Depress the reset switch to initiate the
system and extinguish the cut-out indicator.
Your unit is fitted with a Eurotherm 2208L controller and the parameters are
factory set and should not be changed.
As the fluidised bath heats up the fluidisation will become more vigourous, due to the
expansion of the fluidising air. Units fitted with the automatic fluidising air control system will
automatically reduce the air input so as to keep a constant level of fluidisation. Manually
operated units must the fluidising air flow, reduced unit the level of fluidisation returns to its
origional state. The following table indicates the flow rates that are factory set on an auto-air
unit
Ambient to 200°C 300 l/min
200°C to 400°C 180 l/min
400°C to 600°C 130 l/min
The fluidised bath should be operated with the bath lid fitted to reduce heat loss
during the heat up period, and to increase the efficiency of the fume extraction system. As the
temperature of the fluidised bath approaches the set point, the heater indicator, situated in the
temperature controller fascia, will cycle on and off, until the actual temperature reaches the set
point temperature.
It may be desirable, depending on the process being carried out in the fluidised bath,
to check the actual bath temperature with an independent temperature sensor. Any offset in the
temperature may be corrected by adjustment of the temperature controller (an instruction
manual for the temperature controller is included with this manual). Further temperature
checks may be made at various points within the fluidised bath to ensure good temperature
uniformity is being achieved throughout the bed. Slight adjustment of the fluidising air flow rates
will reduce any excessive temperature gradients.
CAUTION: Care should be taken when handling hot parts which have been removed
from a fluidised bath. We recommend that protective clothing (gloves, aprons, and visors, etc)
be worn at all times when working with fluidised baths and that the installation and maintenance
procedures outlined in this booklet be followed explicate.