The Techne SB Fluidised Baths offer a safer alternative to the dangers associated with high temperature oil and salt baths. These units are designed to be bench or floor standing and only require an electrical and air supply for operation. Air passes through the mass of the aluminium oxide (Alundum) particles via a porous plate in the base of the unit separating the individual particles and suspending them in free air, giving the properties of a liquid bath.
Techne FB-08C Key Features
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 alters the air flow rate according to the temperature of the fluidising medium. This automatic air feature is controlled by electronics which switch 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' state 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 +/-0.01degC over the range of the unit.
The air flow to the fluidised thermal mass is automatically adjusted in order to maintain ideal isothermal conditions throughout the temperature range of the unit.
Variable ramp rates of heating can be programmed with the built in Eurotherm 2408 controller or via a PC using an optional software package (please contact our sales office for information).
A probe holder is available as an accessory which is manufactured to special order to suit sensors under test that enhances the thermal conditions (control stability and uniformity) of the temperature zone within the baths.
Model FB-08C standard controller Eurotherm 2408
The Eurotherm provides superb control by using a combination of a highly developed three term control strategy, supported by both self and adoptive algorithms with dual PIC.
The adaptive tune runs continuously in the background. It monitors the process and modifies the control if a disturbance takes process outside preset limits.
The programmer has one programme of 16 segments (4 and 20 program model are also available please contact our sales department).
High resolution ramping with assured soak periods provide a precise capability.
F932D SBS-4 (230V) including overspill flange but excluding alundum
F932P SBS-4 (120V) including overspill flange but excluding alundum
F946D SBL-2D (230V) including overspill flange but excluding alundum