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Hot Air Ovens - Hot Air Oven Equipment >> Oven

What are hot air ovens?

Hot Air Ovens ( فور آزمایشگاهی ) is a widely used device for sterilization. It is mostly used in hospitals, laboratories and dentistry to sterilize contaminated instruments. With the advancement of technology and the emergence of instantaneous vacuum, its use is increasing day by day and is being used in various industries.
Hot air ovens.

A laboratory dryer or dryer is used for drying and disinfecting glass and metal containers, temperature tests, and temperature sensitive tests. Lab drying is very important because drying that is too fast, too slow, or unevenly can disrupt the whole process. Kilns are also known as “laboratory furnaces” or “furnaces”. They have a temperature between room temperature up to about 300°C. Elements above 300 degrees are typically used in more specialized fields such as physics and materials analysis.

فور آزمایشگاهی

Hot Air Ovens Specifications

It has a steel body, fan, timer, thermometer, temperature regulator, thermostat and floor system. Sterilization times for hot air ovens are 160°C for 2 hours, 171°C for 1 hour, 180°C for 30 minutes, and 191°C for 6 to 10 minutes.

فور آزمایشگاهی قیمت

Hot Air Ovens Components

Inner chamber : This chamber is where the equipment used for sterilization is usually made of stainless steel and resistant to high temperatures. This room is also the location of the temperature sensor and thermocouple.

Heating elements : These components are designed to provide the required heat for the furnace and are usually in contact with the outer wall of the furnace and, if necessary, raise the temperature inside the furnace. Inside, one or two components are placed depending on the make and model of the device as well as electrical power. These elements are usually of the spring type and are placed inside a heat-resistant ceramic coating to prevent the transmission of electric current and to do so in the next room.

Thermal insulation : These insulators are installed to prevent heat loss and rapid cooling of the inner room, as well as to prevent overheating of the outer room and electrical circuits, as well as the external environment, which is usually made of fiberglass.

Control system temperature control inside the cabin: Depending on the type of instantaneous user, can provide two systems separately or in an integrated system. The room temperature monitoring system may be a portable thermometer, mercury thermometer, or an electrical panel with a thermal sensor and digital display. Depending on the device, the temperature control system can be in the form of metallic or mercury thermocouples or microprocessor systems with sensitive sensors. In this case, the temperature display system and the control system can be combined.

Protection systems : Depending on the device, electrical and thermal protection systems are provided to protect the users, the device and its contents. These systems include emergency power valves, a very high temperature power outage system (temperature control system not working) and an Ein system.

اجزا آون آزمایشگاهی - Hot Air Ovens

Types of hot air ovens

  1. Four blades: To disinfect metal parts up to 1100°C
  2. Instant cleaning process: to disinfect medical equipment up to 260°C
  3.  Internal combustion: To disinfect small parts such as conductors and microprocessors at a temperature of 260 degrees.
  4. For Rich: Used to disinfect all elements due to the same temperature

How to use hot air ovens

To quickly disinfect items, wash and dry the appliance first. Then sort the items. Connect the device to the power source according to the following principles and wait for it to warm up immediately after turning it on.

Insert the device into the device and sterilize it. Let it cool immediately after timing. Remove sterile equipment from the machine and store it in a suitable place.

Make sure that the device that is placed in the disinfectant immediately is not flammable. For example, it is better to use an autoclave for sterile fabrics and…. If there is no disinfectant, be careful not to immediately sterilize flammable materials.

Its temperature should not exceed 120 ° C.
A socket must be used to connect the device to the power source. In addition, when working with the device, be sure to close the lid and dry the inside of the device.

If the inside of the appliance is wet, first dry it with a clean cotton cloth and then use the appliance.

When purchasing a device, make sure that the device meets the required standards. Since the device is sensitive and the manufacturer does not meet the required standards, there may be many risks.

Never open the appliance before it has cooled down. Because glassware can break due to sudden shrinkage. Do not place flammable devices or liquids near them. The device must be tested and evaluated by a technician every 6 months.

فور آزمایشگاهی

Use of hot air ovens

  • In the pharmaceutical industry, environmental technology, food industry, agricultural and forestry industry to determine the amount of dryness and the amount of moisture (drying method)
  • In electronics for drying components, epoxy resin gases and combustion tests
  • In the search for sample preparation
  • Aging or hardening of plastics and metals
  • Sustainability testing in the food industry
  • Heating storage for building materials, plastics and spare parts
  • Warming surgical tissues, blankets, washing solutions, injection solutions, etc. in clinics and hospitals

Oven sterilization

This device is used to sterilize materials that have not evaporated enough steam, but can withstand the required high temperatures such as 160-180°C. This amount of heat is used to sterilize glassware such as test tubes, Petri dishes, flasks, and straws, as well as metal tools such as pliers, knives, and scissors.

You can use aluminum foil or kraft paper and cotton pads to wrap these items. Of course, paper and cotton burn slightly, and cotton wool can release germicidal volatile substances. Glass test tubes should be covered with aluminum foil covers and placed vertically in place of the metal tube. The cap protects the edges of the tubes from air contamination during subsequent storage.

Cover the upper end of the tube with non-absorbent cotton to a depth of about 2 cm, then place it in a metal container and close the lid. If tubes are only needed occasionally, they can simply be made with kraft paper.

If the caps and caps (inner layer) are made of materials such as metal, Teflon, polypropylene, or silicone rubber that are naturally sterilized at sterilizing temperatures, capsule bottles can be sterilized in hot air. They are inseparable.
Before placing glass containers inside, make sure they are dry. It is recommended to heat it to 100°C first.

Sterilization of powders, oils and greases in insulated glass or metal containers (tightly packed and closed) of small sizes, weighing no more than ten grams or one centimeter.

Materials or packages should be placed so that hot air flows between and around them.

If the caps and liners are made of materials such as metal, polypropylene, or silicone rubber, the capsule bottles can be sterilized so that they do not deviate from their natural shape at the sterilization temperature.

Finally, close the door and turn on the appliance. Since the device is insulating, it may take several hours for things inside to cool down. But in the case of a cooling fan, the cooling phase is accelerated.

The sterilization storage period begins from the moment the room reaches the disinfection temperature and begins at a higher temperature so that all parts of the room and the load inside it reach the required temperature. Sterilization temperature 160-180 degrees Celsius, for two to four hours.

Do not open the lid to allow the hopper (container and materials) inside to cool below 60°C. If cold air suddenly enters the appliance, the glassware may crack because it is still too hot.

Typically, temperatures below 100°C are used in drying equipment.

آون آزمایشگاهی

The difference between hot air ovens and autoclaves

Furnaces It is a type of laboratory device that creates a controllable internal ambient temperature enclosed in a steel chamber. This temperature reaches 250 degrees Celsius. This heat is provided by the elements surrounding this room. Drying and sterilizing laboratories and medical instruments in all quality control and medical diagnostic laboratories.

Some sterilizing tools and materials are sensitive to steam and impermeable to steam, and the oven is very suitable for sterilizing these materials and can withstand temperatures up to 160-180 degrees Celsius. Tools such as test tubes, glassware such as pipettes, Petri dishes, and using ovens are very suitable for them and also for sterilizing metal tools such as pliers, scissors, knives and autoclave variations and come immediately.

For sterilization, the stove must have an internal door lock, a fan (for the circulation of dense air in the room), a thermostat and timer, a temperature indicator, furnaces, and adequate wall insulation. This is where we realize the difference and importance between an autoclave and an autoclave.

While some express the difference between an autoclave and an oven, heat is transferred in two ways. A: It is made naturally and spontaneously and there is no heat production.

Second: Because of the heavy cold air and light hot air, it is used by the fan or to move the air inside the oven chamber, while another type of heat is produced in this device.

There are different types of ovens and the oven temperature usually ranges from 350°C to room temperature.

In this type of laboratory setting, equipment is sterilized by setting the dry temperature between 160 and 180°C for two hours.

When expressing the difference between hot air ovens and autoclaves, it should be noted that the autoclave is commonly used to sterilize glass plates, sharp surgical instruments, dental instruments, pipettes, needle heads, test tubes, and glass syringes, to prevent rust, corrosion and slowdown. Become. Sharp edge of medical instruments

دستگاه انکوباتور

Summarize the difference between autoclaves and ovens

  • Sterilization is performed immediately in a dry form but in a wet sterile autoclave.
    The temperature can be controlled instantly, but it is usually constant in an autoclave, and the most important difference between an autoclave and an express is.
    The introduction prevents rust as well as slows down sharp and delicate tools.
    Autoclave: To disinfect flammable materials and materials such as guns, etc.
    If the autoclave is not standard, it will cause explosion and damage

Safety Tips for Using Hot Air Ovens

  • Ensure equipment is standard and calibrated by reference laboratories. Because there is no immediate use, without calculation and rule.
  • Use a ground wire.
  • If possible, use the device timer when using the interface and according to your desired sterilization program. This will prevent the device from working unnecessarily.
  • Do not connect two or more plugs to one outlet.
  • Never unplug the power cord or UPS when unplugging the plug. This puts extra load on the system and causes it to crash.
  • To avoid possible burns, do not approach the door when the door is opened immediately, face or other sensitive parts of the body.
  •  

منبع : https://en.wikipedia.org/wiki/Laboratory_oven

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