Specifications

41
precision temperature fluidised sand baths
The FB-08LT Fluidised bath
The FB-08LT Fluidised bath is a precision low temperature bath. It incorporates a cylindrical
fluidised inner container, three term digital set point and indicator controller and two flowmeters
for regulating the fluidised air and liquid nitrogen (LN2) supplies.
● Temperature range –100°C to 200°C
● Control stability, as good as ±0.2°C
● Working volume diameter x depth 165 x 385mm
● Built in drier for air supply
● Digital temperature indication
● Digital temperature set point
This model is specially designed for low temperature operation down to –100°C and is also
capable of operating up to +200°C. The unit includes all of the special features listed for Model
FB-08 fluidised bath. The method of operation is similar to Model FB-08 except that it has
provision for connection to a LN2 supply and is fitted with an air drying system (mounted on the
back of the unit). The air drier is required to prevent moisture in the fluidising air being intro-
duced into the chilled fluidised bed thus preventing the alumina from fluidising. The LN2 supply
is selected with a valve on the front of the unit. It is regulated by a flowmeter which controls the
flow of nitrogen gas into the bath. The gas is exhausted from a connection on the rear of the unit
and should be ducted to a well ventilated area.
At low temperatures the top opening of the bed should be completely closed, using the blanking
plate provided, to avoid warm ambient air being drawn into the bed. The LN2 flows through a
helical tube around the outside of the cylindrical stainless steel containing the fluidised bed.
Temperature is controlled by a platinum resistance thermometer and is indicated on a large digital
display. The entire system is completely self-contained. All that is required is a supply of liquid
nitrogen and air, an electrical supply and you have a dry, safe calibration bath working down to
–100°C with considerable precision. Sensors for calibration should be suspended as close as pos-
sible to the centre of the working area or, for increased uniformity placed in a probe holder.
Technical Information
FB-08LT
Temperature range °C –100 to +200
Temperature stability °C
@ 200°C. ±0.2
@ –100°C ±0.5
Display resolution °C 1
Type of control 3 term (PID)
Sensor type PT100
Heat up time, minutes 20°C to 200°C 30
Cooling time, minutes 200°C to –100°C 90
Air pressure, kPa (psi) 420 (60)
Maximum flow, litres/minute 170
Weight of medium, kg 16
LN2 consumption,
maximum litres/hour 7
Overall size L x W x H, mm 770 x 615 x 600
Working volume Diameter x Depth, mm 165 x 385
2204E Eurotherm FB-08LT Contoller
The Eurotherm is simple to operate and provides 3 term (PID) control functions. Digital set and
readout of the bath temperature. Power is switched via solid state relay. Parameters within the
microprocessor are factory pre-set to obtain the optimum performance from the fluidised bath.
Ordering Information
Model Product Voltage Hz Watts Shipping
Number Code weight, kg
FB-08LT F949L 240 50/60 3000 82
FB-08LT
Circulation of aluminuim oxide promotes
temperature uniformity.
Airbourne particles created by the the
fluidised bed are drawn in to a peripheral
extraction ring connected to a cyclone
collector.
2204E
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-100°C to 200°C