Hot Air Oven:-
A hot air oven is a laboratory equipment used for dry heat sterilization of glassware, metal instruments, powders, oils, and other materials that can withstand high temperatures.
Principle:-
When electricity is passed through the heating coils, electrical energh is converted to heat energy. the tempreture is controlled by a thermostat.
or
The hot air oven works on the principle of dry heat sterilization. Hot air is circulated inside the chamber, and heat is transferred to the articles by conduction, convection, and radiation. The high temperature destroys microorganisms by oxidation of cellular components and denaturation of proteins.
The hot air oven works on the principle of dry heat sterilization. Hot air is circulated inside the chamber, and heat is transferred to the articles by conduction, convection, and radiation. The high temperature destroys microorganisms by oxidation of cellular components and denaturation of proteins.
components :-
1. Double walled heavy gauge aluminium chamber.
2. continuous heat elements externally wound on all sizes of the working chamber(These enable efficient heat transfer by conduction and radiation.)
3. Thermal insulation by thick glass-wool between the working chamber and the outer mild steel casting.
4. Thermostat- A temperature-control device in a hot air oven that maintains the desired temperature by automatically switching the heating element on and off.
5.Adjustable ventilator:- Allow controlled circulation and release of hot air and moisture.
6.Pilot lamp:- A small indicator light on a hot air oven that shows whether the oven is switched on and receiving power.
7.temperature controller:- A device used to set, monitor, and regulate the temperature inside a hot air oven. It maintains the selected temperature accurately for proper sterilization.
8.Perforated metal selves:– Metal shelves with small holes that hold the materials inside the hot air oven and allow free circulation of hot air.
2. continuous heat elements externally wound on all sizes of the working chamber(These enable efficient heat transfer by conduction and radiation.)
3. Thermal insulation by thick glass-wool between the working chamber and the outer mild steel casting.
4. Thermostat- A temperature-control device in a hot air oven that maintains the desired temperature by automatically switching the heating element on and off.
5.Adjustable ventilator:- Allow controlled circulation and release of hot air and moisture.
6.Pilot lamp:- A small indicator light on a hot air oven that shows whether the oven is switched on and receiving power.
7.temperature controller:- A device used to set, monitor, and regulate the temperature inside a hot air oven. It maintains the selected temperature accurately for proper sterilization.
8.Perforated metal selves:– Metal shelves with small holes that hold the materials inside the hot air oven and allow free circulation of hot air.
9. Thermometer:- An instrument used to measure and display the temperature inside the hot air oven.(temperature range 40°C to 300°C)
Uses:-
*Hot air oven is mainly used for the following various purposes:-
*Dry sterilization such as Petri dishes, test tubes, pipettes, and flasks.
*Preparation of anticoagulated bulbs.
*Sterilization of non-aqueous materials like oils, fats, waxes, and powders.
*Heating of chemicals used for the preparation of primary standards.
*Dry sterilization such as Petri dishes, test tubes, pipettes, and flasks.
*Preparation of anticoagulated bulbs.
*Sterilization of non-aqueous materials like oils, fats, waxes, and powders.
*Heating of chemicals used for the preparation of primary standards.
*Drying laboratory materials and equipment.
Procedure for Use:-
1.Place dry articles on the shelves.(In case of glassware, the excess water should be drained completely)
2.Close door firmly.
3.Put on the main switch.
4.Control temperature by adjusting the control Knob.
5.Keep it on for the required time period.
6.Put off the main switch.
7.Remove the articles.
2.Close door firmly.
3.Put on the main switch.
4.Control temperature by adjusting the control Knob.
5.Keep it on for the required time period.
6.Put off the main switch.
7.Remove the articles.
Care and Precautions:-
1.Do not forget to put off the main switch when the heating period is over.
2.Cleen the hot air oven after use.
3.Do not overload the chamber; allow proper air circulation.
4.Switch off the oven after use and allow it to cool before cleaning.
5.Use heat-resistant gloves when handling hot materials.
2.Cleen the hot air oven after use.
3.Do not overload the chamber; allow proper air circulation.
4.Switch off the oven after use and allow it to cool before cleaning.
5.Use heat-resistant gloves when handling hot materials.