Laboratory ovens: Types and uses

Laboratory ovens are equipment used to dry and sterilize different laboratory materials and instruments, as well as dehydrate reagents. They work by gradually increasing their temperature according to their programming, and once the temperature is optimal and stabilizes, the thermal regulator will maintain the temperature; if it decreases, the resistances are activated again to obtain the programmed temperature again.

Forced convection ovens

These ovens allow the use of heat at high temperatures in a progressive manner. They are equipment designed to optimize the response time, stability and temperature uniformity. Forced air from the heating system heats the air and uses a fan to push the air around the ducts or chamber. They have an approximate accuracy of ยฑ 0.5ยฐC and the time in which it stabilizes is calculated between 25 minutes and 40 minutes. This can also vary due to the volume of material inside the equipment and the size of the chamber.

Forced convection allows for rapid drying and heating, temperature uniformity, and rapid temperature recovery after the cabinet door is opened. They have a temperature range from room temperature ยฑ5 ยฐC to 250 ยฐC. This type of oven is regularly used in applications where very rigorous temperature precision is required, since its internal temperature can be exceeded by thermal inertia by up to 2ยฐC. They are used in operations such as the drying of materials, dehydration of substances sensitive to sudden changes in temperature or that could be damaged by overheating, industrial process control for quality and highly explosive areas.

Gravity convection ovens

Gravity convection also called natural convection provides gentle drying and heating with low air turbulence. These equipments have an accuracy of ยฑ2ยฐC and the time in which they stabilize is between 45 minutes to 1 hour, which can vary depending on the volume of material inside the equipment and the size of the chamber. They have a temperature range from room temperature ยฑ5 ยฐC to 210 ยฐC. They are regularly used in applications where such rigid temperature accuracy is not required, because the temperature inside them can exceed 12ยฐC. They are used in the drying of materials, dehydration of substances.

Horizontal flow furnaces

These equipments are widely used for drying seeds, minerals, powders, granular materials, drying plants or vegetation leaves, bark, and reagent vaporization. They have an accuracy of They have a temperature range from room temperature ยฑ 0.5ยฐC and the time in which it stabilizes is calculated between 25 minutes and 40 minutes. This can vary due to the volume of material inside the equipment and the size of the chamber.

Air blast furnaces

These equipments have an accuracy of ยฑ 1ยฐC and the time in which the temperature stabilizes is estimated between 15 minutes to 20 minutes. They are regularly used in applications where rapid temperature stabilization is required and direct airflow over the materials inside the chamber is required. They are used for sterilization of glassware, stainless steel, surgical materials, low-temperature heat treatments, sterilization of materials that cannot be sterilized in autoclaves, and polymer quality verification.

Vacuum Furnaces

These vacuum ovens have an accuracy of +-1ยฐC. They are very useful instruments in heat treatment, drying, curing, simulating environments with other characteristics of gases or contaminated environments.

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