Hot Air Oven
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The basic Working Principle of Hot Air Oven:
in simple words is the forced circulation of hot air inside the chamber of oven. Although scientifically speaking a Hot Air Oven applies the combined theories of thermal convection and also thermal radiation during an operation cycle. It is a scientifically proven phenomenon of thermal convection that in any given chamber hot air rises because of molecular expansion happening by infusion of thermal energy in it causing molecular displacement and forcing the downward displacement of denser cold air. So by utilizing this principle when the hot air reaches the top of chamber it is rapidly circulated back to bottom by a fan installed inside the chamber and hence optimum amount of heat is achieved gradually inside all the corners of Hot Air Oven.
Uses of Hot Air Oven can be described as below:
• In R&D centers & institutions for research and development purposes.
• For sample testing and product evaluation in industries using tests like aging, compression set, heat deformation and temperature resistance.
• In hospitals and health centers for various applications such as heating, drying & sterilizing.
Product Name: Hot Air Oven
Product Code: In stock
Hot Air Oven is a specially designed test chamber used for treating and testing of various chemicals, product samples. Sterilization of glassware in laboratories is also an important use of Hot Air Oven which is performed at temperatures up to 250°C. A hot air oven elaborates various intricate test parameters of product samples involving minute changes in physical characteristics as well as its chemical composition. A detailed description which will help you understand design, construction and working concepts of a hot air oven is written below:
The outer structure of a lab hot air oven is constructed of mild steel / stainless steel depending upon the application and preference of the customer. Generally ovens exposed to high humidity conditions or microbiology labs are made up of stainless steel, as it will not get rusted due to humid environment and in microbiology lab it will help avoid any contamination which might arise from the fumes of exterior paint applied on non stainless steel models. The body of a hot air oven is constructed using strong seamless welding and in mild steel body models it is covered with a thick layer of epoxy polyester paint. This provides a strong, heat and scratch resistant surface resulting in a long lasting attractive finish. Internal chamber (including the doors) of the lab hot air oven is fabricated from high grade stainless steel to achieve maximum strength and long shelf life.
Construction of Hot Air Oven:
After primary fabrication of the double walled oven body which is designed to achieve minimum heat loss, high grade insulation is inserted in the empty space between the inner and outer chamber of the oven body. The insulation material used is glass wool for ovens till maximum temperature of 250 degree Celsius and mineral wool for insulation in high temperature ovens and furnaces i.e 250 degree Celsius and above. Heating elements of the hot air oven are made of high grade kanthal resistance heating wire which is inserted inside ceramic beads and placed at the bottom and in both the side ribs of the oven for uniform temperature across the chamber. The door of hot air oven closes on to an asbestos gasket and the shelves slide neatly into the fixed runners provided on side walls of the oven chamber. Fixed ventilators are also provided on both sides of the Hot air oven's wall to facilitate the ventilation of air as per operational requirement.
A Digital Microprocessor based PID Temperature Controller & Display unit is provided to keep a constant check on the temperature which is being displayed on the seven segment L.E.D display and also to set the temperature range according to the requirement. The hot air oven is mounted on four rubber foots toprevent slipping and this protects the bench surface. The control panel houses a main ON/OFF switch, LOAD ON/OFF Indicator lamps and A Digital Microprocessor based PID Temperature Controller come display unit. With an Endeavour to constantly upgrade our equipment we have also introduced data logging facility in our hot air oven but the data logger controller is not part of the standard equipment and is added on special orders only.