♦ Type of furnace: Vertical three-zone split tube furnace
♦ Furnace bore: The furnace end insulation discs are bored out to 30mm diameter. The heating chamber has an internal diameter of approximately 90mm
♦ Heated length: 300mm over three zones
♦ Heating elements: Spiral wire coils embedded in vacuum formed ceramic fibre half cylinders
♦ Overall external dimensions: 480mm high x 255mm diameter
♦ Temperature control: Each zone controlled by a Tinius Olsen advanced set point programming temperature controller with 20 free-format segments. Scrolling text provides additional information of current status to the user. RS232 digital communications facility is included
♦ Temperature sensors: Type ‘N’ thermocouples
♦ Safety switch: A safety switch cuts power to the elements when the furnace is opened
♦ Power supply: 220-240V
♦ Energy rating: 2.5kW (nominal)
♦ Temperature uniformity: +/-5°C or better over a length of 200mm at temperatures above 650°C. Figures based on measurements taken with an empty heating chamber and all holes insulated
The control system is based on a Eurotherm 2408 digital temperature controller, providing four-segment programmability, a single type ‘K’ thermocouple and all connecting cables. This is all housed in a standard 19in desktop console.
The three-zone furnace is provided with the additional heating tiles and control capability to allow much improved thermal uniformity over the specimen gage length.