Important Q&A’s About Muffle Furnace working

Muffle Furnace working operation Q&A

Q: How Muffle furnace Works.

A: Muffle furnace works on the principle of electrical heating with the help of heating elements.  Heating elements are connected through contractor /SSR / Transformer.  PID controller controls the temperature and display on the screen with the help of thermocouple. Muffle furnace designed for many industrial and research application. There are few Q & A asked by many users regarding muffle furnace.


Q: Can we purge Nitrogen gas in Box furnace?

A: NO, purging any gas inside the chamber is not possible. For gas treatment there is a new kind of furnace and we call it atmospheric furnace. There is a huge difference between box furnace and atmospheric furnace.


Q: What is Atmospheric Furnace?

A: This type of furnace is specially designed for gas purging and vacuuming before gas transfer into the chamber. Atmospheric furnaces are fully sealed from all side of the chamber so that it can maintain the vacuum and gas pressure inside the chamber. This furnace is used for those substances which can easily undergo the oxidation while heat treatment.

After closing the door we start vacuum pump and creates vacuum inside the chamber. In full vacuum condition we purge the nitrogen gas inside the chamber and creates inert atmosphere in muffle furnace. After Purging of nitrogen gas we start the heating the muffle furnace chamber.


Q: Can we purge Nitrogen gas after reaching the set temperature?

A: Purging of Gas and vacuuming is not possible in hot environment inside the chamber. Nitrogen gas is colder than Air and it can give thermal shock to heating elements which can damage the heaters and interrupt our operation. It is always recommended to purge nitrogen gas inside the chamber prior heating the chamber.


Q: What is the Difference between Tube furnace and Box furnace?

A: Tube furnace is generally used for chemical synthesis under inert atmosphere condition where box furnace is used for heating and ash content measurement.  All tube furnaces are atmospheric furnaces and box furnaces are heating muffle furnaces.

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