Composition of electric blast drying oven

The electric blast drying oven is composed of a box, an electric heater, a temperature controller, a fan, a convection circulation air duct, an inlet air duct, an outlet air duct, and an outlet size adjustment device.
Operating procedures for electric blast drying oven:
1、 Operating procedures:
1. First, set the desired temperature on the temperature digital display controller, then turn on the power supply to turn on the heating switch, and turn the temperature control button to the "high temperature" position. At this time, the temperature in the box starts to rise, the green indicator light lights up, and the digital display will display the temperature in the box.
2. When the temperature rises to the desired temperature, the red and green indicator lights alternately turn on and off, indicating that the temperature in the box fluctuates around the set temperature value, which is the constant temperature fixed point. At this time, you can turn the temperature control button to the "low temperature" position, turn off a set of heating switches, and leave only one set of electric heaters to work, in order to avoid excessive power affecting the sensitivity of the box.
3. After reaching the temperature, it can be kept at a constant temperature for a certain time according to the needs of the test. During this process, the box door should not be opened frequently to avoid affecting the temperature inside the box.
2、 Precautions for electric blast drying oven:
1. The drying oven needs to be installed in a dry and stable room without using other fixed devices. The ambient temperature is generally not greater than 400C, and the relative humidity of the air is not greater than 85%.
2. The working chamber of the electric blast drying oven is sprayed with high-temperature resistant silver powder paint as a anti-corrosion paint layer, and it is not allowed to be damaged to prevent rusting of the box.
3. If there is no overtemperature protection device for the electrothermal blast drying box, a dedicated person should monitor the temperature in the box during operation. Once the temperature fails, power off immediately for inspection to avoid accidents.
4. The large average load of the sample shelf Zui of the electric heating air drying oven is 15 kilograms. Do not place objects too heavy or too dense, and make sure to leave gaps. At the same time, do not place samples on the working low plate (radiator).
Solution to high temperature surge in electric blast drying oven
Excessive temperature overshoot refers to the phenomenon that when the electric blast drying oven is turned on for several times, the temperature of the working chamber exceeds the set temperature by more than 5 ℃, and then slowly decreases and stabilizes at the set temperature. Some pharmaceutical, biological, chemical, food, electronic and other industries are relatively sensitive to this phenomenon.
Although there is no limit for temperature overshoot in the standard for electric blast drying boxes, with the continuous improvement of control technology, the temperature overshoot of electric blast drying boxes has generally been controlled below 2 to 3 ℃.
It is impossible to completely eliminate temperature overshoot. There are ways to achieve acceptable temperature overshoots. For users who previously purchased old-fashioned (position control instrument) products, there are two options for users to choose from:
1. Empty box constant method; First, raise and stabilize the temperature of the working chamber to the desired drying temperature in an empty box, and then quickly put the test sample into the working chamber. In this method, attention should be paid to protecting the operator from burns. More attention should be paid to the new hazards that may arise from the volatilization of the dried sample due to its rapid volatilization rate.
Two-stage temperature rise method; Set the temperature of the instrument at a temperature difference of 5-10 ℃ from the desired temperature (the specific difference can be determined by the user based on the ambient temperature and the amount of the sample at that time), and then reset the temperature of the instrument to the desired drying temperature after stabilization.

The above content is organized by Superb heater Company, super heater. Mainly professional production: industrial heating elements, temperature measuring elements, production equipment, accessories, and raw materials such as tubular heaters, tubular heaters, belt heaters, ceramic heaters, silicone rubber heaters, thermocouples, etc.

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