precision temperature fluidised sand baths
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precision temperature fluidised sand baths TE 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 Temperature range °C Temperature stability °C Dead bed Short term @ 50°C Long term @ 50°C. Short term @ 600°C Long term @ 600°C Display resolution °C Type of Control Sensor type Heat up time, minutes 20°C to 700°C Cooling time, minutes 700°C to 200°C Air pressure, kPa (psi) Maximum flow, litres/minute Weight of medium, kg Overall size L x W x H, mm Working volume Diameter x Depth, mm Ordering Information Model Number FB-08C Product Voltage Hz Watts Code F949J

precision temperature fluidised sand baths 2408, Eurotherm FB-08C Controller The Eurotherm controller provides superb control by using a combination of a highly developed three term control supported by both self and adaptive control algorithms with dual PID. The adaptive tuning runs continuously in the background. It monitors the process and modifies the control if a disturbance takes the process outside preset limits. The 2408 controller accepts one program of 16 Segments. STEADY STARE TEMPERATURE ±0.01ºC for a period of 6 minutes LOGGING PERIOD DEAD BED STARE FLUIDISING AIR AND POWER...