These ovens carry a fan that gives limited air circulation within the heating container.As hot air flows up, a gentle flow holds temperatures moderately uniform inside a container and wholly uniform in any distinct position. Gravity Convection Air is distributed by spontaneous convection.There are present different types of hot air oven such as Gravity Convection Hot air oven diagram | Image Source: Types of hot air oven It keeps your oven and specimen safe in case of controller malfunction. Safety thermostat: It is also known as an over-temperature protection device.Mains on/off switch: It helps to turn on/ turn off the hot air oven.Load indicator: it indicates the hot air oven is overloaded.It also controls the temperature and also displays the temperature values. PID temperature controller: It maintains the accurate temperature during the entire cycle.Tray slots: The inner wall of the chamber contains several try slots that hold the trays.Temperature sensor: It measures the temperature within the hot air oven and displays it on the controller screen.Motor-driven blower: It helps in uniformly circulating the air within the chamber.Two Tubular air heaters are located on both sides of the inner chamber. Tubular air heaters: They help to generate heat within the inner chamber.Inner chamber: The inner chamber of the hot air oven is made of Stainless steel.It provides insulation to the hot air oven. Glass wool insulation: The space between the inner chamber and external cabinet is filled with Glass wool.External cabinet: The External cabinet is made of stainless sheets.Hence, a few organizational facilities are needed if it is practiced in the medical laboratory, so that workers can create a schedule of the sterilization method. This is approaching a longer method than autoclaving or moist sterilization. This current flow assures the proper and uniform heating everywhere in the chamber. It helps in the circulation of air within the chamber. If air hits the roof of the chamber it travels towards the ground of the chamber. While the air shifts hot, it becomes thinner and transfers towards the ceiling of the chamber. It is termed a dry sterilization process because the procedure is performed by employing the hot air. It primarily acts on the principle of structure where heat moves on the outside of the substance and then to the core of the item. Hot air oven acts in a manner so that items stored inside the oven don’t grab fire or meltdown. This method is proper for items like glassware, powders, oil containing materials, metal material. The temperature is kept for about an hour to eliminate the most ambitious of the resistant spores. The primary cell components are damaged and the organism dies. The whole object will ultimately attain the temperature needed for sterilization to take place.ĭry heat causes most of the injury by oxidizing particles.
The temperature is consumed by the surface of the objects, then moves towards the core of the object, coating by coating. Sterilization by dry heat is performed by conduction. In a hot air oven first, the surface of the material is sterilized then the temperature slowly enters the center of the item.It can be controlled by using a temperature regulator. The temperature range of a hot air oven is 50 to 300 ° C.The process of dry heat sterilization using a hot air oven Originally developed by Louis Pasteur.Most of the medical industries use hot air ovens to sterilize laboratory instruments and material due to its simple standard operating procedure and low price.The widely used temperature-time relationship in hot air ovens to destroy microorganisms are 170 degrees Celsius for 30 minutes, 160 degrees Celsius for 60 minutes, and 150 degrees Celsius for 150 minutes.
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