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Hot air oven. Hot air ovens are electrical devices which use dry heat to sterilize. They were originally developed by Louis Pasteur. Generally, they use a thermostat to control the temperature. Their double walled insulation keeps the heat in and conserves energy, the inner layer being a poor conductor and outer layer being metallic.
- Principle of Hot Air Oven
- Types of Hot Air Oven
- Hot Air Oven Operating Procedure
- Applications of Hot Air Oven
- Advantages of Hot Air Oven
- Limitations of Hot Air Oven
- Precautions
- Hot Air Oven Examples
- References
Hot air oven works on the principle of the dry air sterilization process through convection, conduction, and radiation. The heating elements heat the air inside the chamber, which may be circulated evenly within it with the help of fans such that the sample surfaces are exposed to hot and dry air. This exposure causes the heating of the external su...
Natural convection oven/ Gravity convection oven
It operates on the principle of natural convection in which the heated air at the bottom of the device rises towards the ceiling, where it starts to cool and again descends toward the floor such that the cycle of heating and cooling continues within the device naturally. It has no uniform distribution of temperature and is suitable for powder samples.
Forced convection oven
The forced convection oven employs a motorized fan/blower to force the hot air to distribute uniformly throughout the entire interior of the chamber. It allows the sample to absorb heat and dry faster since they are always in contact with hot air.
Side draught oven
It has a unidirectional flow of air from one side to the other such that samples achieve maximum heat absorption in a short time. It is ideal for preheating plastic clothes in hospitals or smooth sheets or plates.
Here are the steps of operating a hot air oven: 1. The oven is plugged into the socket and switched on. 2. The oven is preheated for 30 minutes before placing the items on the trays or shelves. 3. The temperature gauge is set at the desired time, depending on the volume of the contents to be sterilized. 4. The items are loaded on the shelves (appro...
Some of the applications of hot air ovens are: 1. It is used for sterilization of laboratory equipment such as glassware (flasks, pipettes, Petri-plates, and test tubes), culture media, metal items (forceps, spatula, scalpel, scissors), non-volatile compounds (zinc and starch powder, sulfonamide), and other materials that contain oils. 2. It can be...
It does not require water for sterilization purposes like an autoclave.It is economical and easy to operate.It can function at higher temperature and faster than autoclave.The small size of the oven requires less space and has an easier installation process.It is not suitable to sterilize items such as rubber, plastics, surgical dressing, etc., due to their low melting point.It may not destroy the heat-resistant endospores and prions because they utilize dry heat instead of moist heat.It is time-consuming relative to steam, flaming, chemical sterilization, or radiation.Only materials that are compatible with dry heat sterilization should be used. Combustible items are strictly prohibited from sterilization in a hot air oven.The items should be wrapped in paper or newspaper and placed in a cardboard or metal container. Cotton wool can be used to plug in test tubes, flasks, and pipettes.An individual must wait before opening the door so that the oven is allowed to cool up to 40°C. This prevents glassware breakage.Thermal gloves or tongs should be used to remove items from the oven.Heating Oven EG
1. Availability of single or double-door pass-through hinges. 2. The volume of the chamber ranges from 330 to 10,000 liters. However, it is customizable depending on the customer’s requirements. 3. It has high performance, reliability, and efficiency with reduced energy and time consumption. 4. The self-washing system can be installed for the Clean-In-Place (CIP) of the chamber and air ducts. 5. The temperature range is 50 °C – 160 °C.
Heat Oven FAC-100
1. Presence of a microprocessor-PID controller to maintain and achieve the desired temperature. 2. Adjustable stainless-steel shelves and double-walled chamber with fiberglass insulation in between. 3. The capacity of the chamber is 100L, with an operating temperature range between 5 °C – 220 °C.
Sterilization Oven FN series
1. The triple insulation comprises glass wool, an aluminum layer, and an air gap. It ensures high efficiency and reduced energy consumption. 2. Uniform temperature can be maintained throughout the chamber by natural air convection. 3. To minimize temperature loss, the door can be pressed tightly on the chamber gasket. 4. FN series facilitate dry heat sterilization in medical, veterinary, dentistry, and research settings.
Alkadhim, Saif Aldeen Saad, Hot Air Oven for Sterilization: Definition & Working Principle (December 14, 2018). Available at SSRN: https://ssrn.com/abstract=3340325 or http://dx.doi.org/10.2139/ssr...https://www.laborildam.com/en/category/cell-theraphy-gmp-glp/natural-convection-type-ovenshttps://labproinc.com/blogs/laboratory-equipment/how-do-laboratory-forced-convection-ovens-workhttps://tempoinstruments.com/blog/hot-air-oven-guide/Aug 11, 2022 · A hot air oven is the most common method of sterilization in the laboratory working on dry heat. Sterilization is the process of removing or destroying all microorganisms including viruses, bacteria, and their spores from the article or surface without destroying their quality and quantity. It is a physical method of sterilization due to dry heat.
May 21, 2024 · A hot air oven is a laboratory device used for the sterilization of equipment and materials. Unlike steam autoclaves, which use moist heat, hot air ovens utilize dry heat to eliminate microbial life, including bacteria, viruses, and spores.
Feb 10, 2024 · A hot air oven is an electrical device that uses dry heat to sterilize materials that can resist heat, thereby removing microorganisms, such as bacterial spores, from the objects that are placed inside its chamber. One of the most important tools for both scientific and medical study is the hot air oven.
Apr 3, 2024 · A hot air oven is a laboratory appliance that is used to dry, sterilize, or heat materials. It works by circulating hot air inside the oven chamber to evenly distribute heat to the materials being processed. Hot air ovens are often used in a variety of settings, including research laboratories, industrial settings, and educational institutions.
Feb 28, 2024 · A hot air oven is an essential laboratory equipment used to sterilize heat-stable media, chemicals, laboratory glassware, and other equipment (such as scalpels, scissors, and blades). It uses dry heat to kill microorganisms and operates from 50 to 200 °C.
