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.
