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| The latest introduction into the extensive range of high temperature furnaces provided by Carbolite is the Zircothal furnace developed by Kanthal, with a maximum operating temperature of 2050°C+. Zircothal heating elements do not conduct electricity below 800 deg C and must therefore be preheated before becoming electrically conductive. This is acieved by heating an outer chamber by four Kanthal Super 1900 elements. The inner work chamber is heated by four Zircothal elements controlled by an optical pyrometer and is insulated by ZrO2 bricks. Control of the preheating element temperature is by type B thermocouple. An optical fibre device is used to monitor the element temperature; this ensures good control (accuracy of +/-1% of actual temperature) at high temperature without the drift in accuracy suffered by thermocouples after long exposure to very high temperatures. On this model the Eurotherm 902P programmer is offered which has 16 segments and a simple operator interface. Samples are loaded via a side hinged door with an opening measuring 88mm high x 87mm wide. |  |
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