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Techne FB-08 Fluidised Bath
The FB-08 is an attractively finished rectangular bench
standing unit. The controls for temperature and
fluidising air flow are mounted on a recessed panel on
the front of the unit, together with on-off switches for
the power supply and the dust extractor and indicators
for various functions.
Temperature range 50degC to 700degC
Temperature stability, as good as +/-0.2degC
Working volume diameter x depth 165 x 385mm
PID temperature control
Digital temperature indication
Digital temperature set point
The inner container is well insulated and the
outer case is vented so that it remains safe to
touch even when the bath is operating at its
The inner container is filled from the top with
alumina. When fluidised this medium is
heated by four immersion heaters close to
the container wall; the control thermocouple
is close to the heaters. The heater elements
are protected (by a pressure switch operated
by the fluidising air) from excessive surface
temperatures if fluidisation is lost.
Clean dry air from an external source passes
through two filters and two regulators, to
reduce the pressure for the cylone extraction
system and for fluidisation.
The fluidising air passes through a flowmeter
and then to a plenum chamber from which it
is distributed evenly round the inner
Dust extraction is by means of ambient air
drawn down past the probe plate and
through a peripheral slot round the top of
the inner container, then through a cyclone
to the exhaust filter. Entrained medium,
removed by the cyclone and discharged into
a special jar accessible from the front of the
unit, can be emptied back into the bath at
Sensor Calibration is simple and easy with the
FB-08 series fluidised baths.
Set the bath to the required calibration
Suspend the sensor to be tested in the bath
(using the probe plate supplied) close to the
centre of the working volume and allow the
bath to stabilise for a short period.
Calibration can now be carried out using
either a certificated standard (Comparison
method) or the readout from the FB-08
control unit (direct method).
For a larger view, please click on the photo above.
In operation, set the flow of fluidising air by
means of a combined control valve and
flowmeter. The setting will vary depending on
the operating temperature; at higher
temperatures a lower flow rate is required for
Select the required operating temperature by
depressing and releasing either the up or
down button on the front panel of the
control unit. The digital display will indicate
the set point value for two seconds and then
revert to bath temperature.
Sensors for calibration should be suspended
as close as possible to the centre of the
working volume. Nothing should be put into
the bath which obstructs more than one third
of the cross-sectional area of the fluidised
standard controller Eurotherm 2208L
The Eurotherm controller includes 3 term
(PID) control functions, digital set and
readout of the bath temperature. Power is
switched via a solid state relay.
This controller has dual 4 digit display
which normally shows the process variable
and the setpoint.
Individual indicators show
manual mode, setpoint
rate limit selected and
output status. A feature
is the ability to 'hide'
parameters to allow
operators access only to
the information required.
FB-08 and FB-08C Upgrade to fit Dust Suppression System and Probe Holder
Please note - Product designs and specifications are subject to change without notice. The user is responsible for determining the suitability of this product.
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