1 Classification Overview

Drying oven is divided into electric constant temperature drying oven, electric blast drying oven, vacuum drying oven, infrared drying oven, etc. according to different drying substances. It has been widely used in industries such as food, biochemistry, electronic communication, plastics, cables, electroplating, hardware, automotive, optoelectronic industry, rubber products, molds, spraying, printing, medical, aerospace, and higher education. The huge market demand has diversified the variety of drying ovens, and the quality of product construction is also different.

2 Use and Maintenance 

2.1 Electric constant temperature drying oven

（1） Purpose

Suitable for use in drying, wax melting, sterilization, etc. in industrial and mining enterprises, laboratories, research institutions, and other departments. But it is not suitable for placing volatile and flammable and explosive items in a drying oven to avoid explosion.

（2） Structure

A drying oven, also known as an oven or oven. It mainly consists of three parts: a chamber, an electric heater, and a temperature control system. In recent years, drying chambers have added temperature displays and temperature setters on this basis.

（3） Precautions

• This chamber is a non explosive drying chamber, so do not put flammable and volatile materials into the drying chamber to avoid explosion.

• When using this chamber, the power supply voltage must match the rated working voltage of the phase chamber, otherwise it may cause damage to the electronic instruments inside the chamber.

• The average negative weight of the test sample shelf is 15 kilograms per square meter. When placing the test sample, do not place it too tightly or overload it. At the same time, do not place the test sample or anything else on the heat dissipation plate that affects the convection of hot air.

• Before use, it is necessary to check the installation position of each electric heating wire of the heater to prevent accidents caused by overlapping or collision of the electric heating wires.

• Do not disassemble the components arbitrarily to avoid damaging the electrical circuits inside the chamber.
• The ambient temperature for use in this chamber shall not exceed 45 ℃.

（4） Protection and maintenance

• Before use, pay attention to checking whether the power supply voltage matches the rated voltage of this chamber to avoid unnecessary damage.
• Do not place this chamber in a corrosive environment containing acid or alkali to avoid damaging electronic components.
• When handling chambers, try to handle them gently to avoid loosening the internal electrical circuit contacts caused by violent vibrations.
• Pay attention to protecting the paint surface of this chamber, otherwise it not only affects the appearance of the chamber, but more importantly, it will shorten the service life of the chamber.

In order to enable the user to repair general faults in this chamber, the following are some troubleshooting methods when faults occur.

(1) This chamber is connected to the power supply, and the green indicator light is on. After a period of time, there is no heating phenomenon. At this time, it is necessary to check whether the electric heating wire connector at the bottom of the chamber is loose or burnt, and replace the electric heating wire if necessary.

(2) If the green indicator light does not light up and there is no contact connection sound after connecting the power supply, it should be checked whether the voltage used is consistent with the model of the machine or whether transportation has caused the wire connection to fall off.

2.2 Blast drying oven

（1） Purpose

This equipment is widely used in industrial and mining enterprises, medical and health, medicine, biology, agriculture, electronics, chemical industry, environmental protection, scientific research institutions and other departments to bake, dry, dissolve, disinfect and other items.

（2） Distinguishing between desktop and vertical air drying oven:

The vertical blast drying oven adopts a rectangular floor structure and is generally placed directly on the laboratory floor. The test instrument is usually located above the drying oven for easy operation. Vertical blast drying chamber: Vertical and vertical forced convection should be used to ensure uniform temperature inside the working room, which should comply with national standards (± 2%). Due to the unique structure of the air duct, the fan is located at the bottom of the chamber, allowing for natural air convection. The vertical blast drying oven has a large power and structure, making it suitable for drying various products or materials, as well as electrical, instrumentation, electronic, electrical, automotive, aviation, communication, plastic, mechanical, chemical, food, chemical, and hardware tools under constant temperature environmental conditions and conducting various constant temperature adaptability tests.

The desktop air drying oven adopts a horizontal chamber structure, with the instrument located on the right side of the chamber. The chamber is small and easy to move for testing. Used in industrial and mining enterprises, colleges and universities, biopharmaceuticals, food processing, scientific research, medical institutions, and various laboratories for drying, baking, melting wax, disinfection, and sterilization of non flammable, explosive, and non-volatile materials. The desktop air drying oven adopts a hot air circulation system consisting of a fan that can operate continuously at high temperatures and a special air duct. The temperature in the studio is uniform and is widely used for drying glassware, experimental samples, food, chemical substances, thermal denaturation, thermal hardening, thermal softening, water removal, dry heat sterilization of vessels and instruments in biotechnology, and drying and aging of electronic components.

（3） Usage precautions

• After connecting to the power, you can turn on two sets of heating switches, and then set the temperature you need by pressing the buttons on the control instrument. The indicator light is on, and the blower switch can be turned on to activate the blower.

• When the temperature rises to the set temperature, the indicator light goes out. At the beginning of constant temperature, there may be a continued increase in temperature, which is due to the influence of waste heat. This phenomenon will stabilize after about half an hour. During the constant temperature process, the temperature is automatically controlled by the temperature controller inside the chamber, without the need for manual management.

• When maintaining a constant temperature, one set of heating switches can be turned off, leaving only one set of electric heaters in operation to prevent excessive power from affecting the sensitivity of the constant temperature.

• The chamber should be placed horizontally indoors.

• A knife switch with an iron shell should be installed in the power supply line for the exclusive use of this chamber, and the shell should be grounded.

• Before powering on, please check the electrical performance of this chamber and pay attention to whether there is any open circuit or leakage.

• When everything is ready, you can put in the test sample, close the chamber door and unscrew the exhaust valve at the top. At this time, you can connect the power and start working.

• Do not remove the side door arbitrarily, disturb or change the circuit. When the chamber malfunctions, it needs to be checked one by one according to the circuit before the side door can be removed.

• This chamber is a non explosion-proof drying chamber, so it contains flammable and volatile materials. Do not put it in the drying chamber to avoid accidents.

• Each drying oven is equipped with two sample shelves. The average load on each shelf is 15 kilograms. When placing the test sample, do not place it too tightly or overload it to avoid affecting the convection of hot air. At the same time, samples should not be placed on the heat dissipation plate at the bottom of the studio to prevent overheating and damage to the samples. (Some users may add partitions or samples that are too dense, resulting in uneven indoor temperature. This can be solved by increasing the amount of air blowing.)