Performances Temperature up to 500°C. Temperature fl uctuation is less than ± 0,2 °C . Temperature spatial variation is less than ± 2,5°C at 200°C (measure done with 9 probes inside the work chamber). Construction 2 sizes of ovens are available: from 125 Liter, 343 Liters. The inner casing is made of corrosion and heating resistant stainless steel, type 321. The outer case is made of sheet steel, finished in a tough stoved epoxy paint. (colour light grey RAL 7035) No contact between inner and outer case and an optimised insulation minimise heat transfer to the ambient air and heat dissipation. Walls and door are insulated with glass fibre. The insulation is 150 mm thick, this ensures effi cicent operation, low external temperatures and excellent thermal stability. A special gasket provides a good seal between the door and the oven body, aiding insulation. The insulation as well as the gasket are asbestos- free. The door is hinged on the right hand side and closed with a robust 2 points fastener.

Heating

The tubular heating elements are sheathed and made of stainless steel. They are ideally placed in the air blow. No- wear switching (solid state relay) is used for activating and deactivating the heating elements.

Internal fan for air circulation

All ovens are fan circulated. The air flow speeds up the heating time and also evens the temperature distribution within the oven. The centrifugal blower is located at the top of the oven, shielded from the workspace by a stainless steel baffle. Air is drawn into the fan from the top in the centre of the oven and passes over the temperature sensor and the sheathed heater elements. The heated air is distributed in the bottom of the oven through the whole width and then re-circulated by the fan.

Exhaust air, fresh air supply

Through access vent, fresh air is provided and pre-heated before entering the chamber. A 40 or 60 mm diameter exhaust vent (depending on the model) is provided with an adjustable valve to control the exhaust air fl ow.

Temperature control and safety

Temperature sensor is a J thermocouple. Temperature is control ed by a precise microprocessor-based controller that provides a high accuracy and prevents the set temperature from being exceeded. The controller digitally displays continuously the set and actual values oftemperature. An independent second electronic controller, with a second thermocouple, has an adjustable upper limit, giving a class 2 protection.

Equipment

Fixed shelving for convenient loading / unloading. 1 shelf is supplied for TH075 and 2 for the other models. Additional shelves are available. A 20 mm diameter access port with fi ber cork is fi tted as standard in the left hand wall of the oven.

Technical data