Furnace:

The furnace and control system must be designed to generate linear heating at over the whole working temperature range of the   furnace and provision must be made to manage any fixed temperature. A huge temperature range commonly -150 °C to 2000 °C of furnaces is used in different instruments manufacturers depending on the models. The range of furnace classically depends on the categories of heating elements are used.

Temperature Measurement and Control

Temperature measurement are generally completed using thermocouples , chromal - alumel thermocouple are  frequent used for temperature up to 1100 °C whereas Pt/(Pt-10% Rh) is employed  for temperature up to 1750 °C. Temperature might be controlled or varied using a program controller along with two thermocouple arrangement; the signal from one actuates the control system whilst the second thermocouple is used to record the temperature.