Specifications

42
precision temperature fluidised sand baths
FB-08C, Fluidised Bath
The FB-08C has been designed to allow for calibration of thermal sensors over the temperature
range 50°C to 700°C with minimum supervision and works in conjunction with a supervisory
computer via an RS232 interface. Basic control programmes are set by the operator allowing for
the control of set temperature, incremental temperature steps, dwell times and control of dead
bed state.
● Temperature range 50°C to 700°C
● Temperature stability, as good as ±0.01°C
● Working volume diameter x depth 165 x 385mm
● PID temperature control
● Multiple set points and dwell times can be set by computer/programmable controller
This model is specially designed to allow the operating temperature of the fluidised bath to be
adjusted from a remote source while the bath is unsupervised. An automatic fluidising air control
system is fitted which adjusts the air flow rate accordingly to suit the set temperature of the bath.
This automatic air feature is controlled by a control system which switches five solenoid valves.
These valves are opened and closed in various combinations, providing eighteen air flow rates
corresponding to eighteen different temperatures throughout the operating range. Where an
ultra stable temperature condition is required a “dead bed” state can be programmed into the
control system. During this “dead bed” condition the air and electrical supply to the fluidised bed
are switched off. For a period of up to 6 minutes the fluidised bed becomes an isothermal mass
without heat input and very low heat loss. Under these conditions the stability at the centre of
the aluminium oxide is ±0.01°C over the range of the unit.
A probe holder is available as an accessory (see page 42) that enhances the thermal conditions
(control stability and uniformity) of the temperature zone within the baths (It is manufactured to
special order to suit sensors under test).
The air flow to the fluidised thermal mass is automatically adjusted in order to maintain optimum
isothermal conditions throughout the temperature range of the unit. Variable ramp rates of
heating can be programmed with the Eurotherm 2408 controller or via a PC using the
optional software package iTools.
Technical Information
FB-08C
Temperature range °C 50 to 700
Temperature stability °C
Dead bed ±0.01
Short term @ 50°C ±0.2
Long term @ 50°C. ±0.5
Short term @ 600°C ±0.3
Long term @ 600°C ±0.5
Display resolution °C 1
Type of Control 3 term (PID)
Sensor type K Chromel/alumel thermocouple
Heat up time, minutes 20°C to 700°C 105
Cooling time, minutes 700°C to 200°C 165
Air pressure, kPa (psi) 420 (60)
Maximum flow, litres/minute 127
Weight of medium, kg 16
Overall size L x W x H, mm 870 x 515 x 600
Working volume Diameter x Depth, mm 165 x 385
Ordering Information
Model Product Voltage Hz Watts Shipping
Number Code weight, kg
FB-08C F949J 240 50/60 3000 84
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50°C to 700°C
FB-08C