SOP on Operation and Calibration of Muffle Furnace

Rahul Kashyap
This SOP describes the procedure for operation and calibration of Muffle Furnace.
  • Connect the muffle furnace to the main supply.
  • Red indicator will begin to glow.
  • Set the required temperature of Muffle Furnace by pressing ‘set’ button of Digital temperature controller and set Increasing/Decreasing Temperature by adjusting coarse and fine button.
  • Start the furnace by turning energy regulator knob to ‘50’ position. The dial of the energy regulator is arbitrarily marked 0-100 position.
  • Green indicator will begin to glow indicating load on.
  • Press the set button of controller to view the set temperature.
  • Furnace will now start heating and load indicator will glow and after attaining the set temperature indicator will off and the indicator will again glow when temperature reduced below the set temperature.
  • Temperature of 900ºC is achieved in about 90-100 minutes.
  • Maximum temperature which muffle furnace attain is 925ºC.
  • Maximum load which muffle furnace attain is 3.5 K.W.
From external agency: Once in a Year.
  • Ensure that furnace chamber should be empty when not in use.
  • Do not open the sample chamber while the equipment is ON.
  • Always use longhand tong for placing and removing the crucible in chamber.
  • Any type of solvent should not keep near the equipment.

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