Smart muffle furnace

With the development of science and technology, the muffle furnace is no longer an experimental device that can only be operated manually. Intelligent muffle furnace, as a highly efficient and energy-saving product of intelligent integration, has begun to appear on the stage of history. It is widely used in the coal industry. In terms of performance, it adopts the operation page shown in Chinese and the input instructions of touch keyboard, making it gradually replace the original position of muffle furnace.

What is the calcination principle of intelligent muffle furnace?

First of all, calcination is the process of pyrolysis of compounds to form crystals. There are physical and chemical changes in the calcination process. The first is thermal decomposition, to remove the chemical binding water, carbon dioxide and other volatile substances. Recrystallization, the process can be obtained a certain specific surface of the crystal. Factors affecting calcination include calcination temperature, gas phase composition and thermal stability of the compound. Muffle furnaces have a wide range of applications and can be used for gravimetric analysis. The muffle furnace has a double shell with an empty center to keep out the air.

Installation of intelligent muffle furnace:

1. After opening the package, check whether the muffle furnace is intact and the accessories are complete. General muffle furnace does not require special installation, just flat on the indoor flat ground or shelf. The controller should avoid vibration and should not be placed too close to the electric furnace to prevent internal components from working normally due to overheating.

2. A thermocouple is inserted into the furnace 20-50mm, and the space between the hole and thermocouple is filled with asbestos rope. Pay attention to the positive and negative poles. Don't connect them backwards.

3. The power switch shall be installed at the power line to control the total power supply. In order to ensure safe operation, the electric furnace and controller must be reliably grounded.

4. Before use, adjust the thermometer indicator to zero. When using the compensation wire and the cold end compensator, adjust the mechanical zero to the reference temperature point of the cold end compensator.

5. After checking the wiring and confirming it is correct, cover the controller shell. Adjust the setting pointer of the temperature indicator to the required operating temperature, and then switch on the power. When the power switch is turned on, the green light on the temperature indicator instrument will be on, the relay will start to work, the electric furnace will be energized, and the ammeter will have current display. With the increase of the temperature in the electric furnace, the temperature indicator indicator pointer also rises gradually, which indicates that the system works normally. The temperature rise of the electric furnace and the fixed temperature are indicated by the traffic light of the temperature indicator respectively. The green light means the temperature rise and the red light means the fixed temperature.

Precautions and methods for re-use of intelligent muffle furnace after first or long-term use:

1. When used for the first time or after long-term disuse, the oven must be used again. The drying time of the oven shall be four hours at room temperature of 200℃. 200℃ to 600℃ for 4 hours. When in use, the maximum furnace temperature should not exceed the rated temperature to avoid burning the heating element. It is forbidden to pour all kinds of liquids and soluble metals into the furnace. It is better to work below the highest temperature of 50℃. At this time, the furnace wire has a long life.

2. The controller must work in a place where the relative humidity does not exceed 85% and there is no conductive dust, explosive gas or corrosive gas. When metal materials such as grease are heated, a large number of volatile gases will affect and corrode the surface of the heating element, resulting in its destruction and shortened service life. Therefore, when heating should be timely prevention and do a good job sealing containers or appropriate opening to be excluded.

3. The controller shall be limited to use within the range of environmental temperature 0-40℃.

4. According to technical requirements, regularly check whether the wiring of the electric furnace and the controller is in good condition, there is no sticking and retention when the pointer of the indicator moves, and use the potentiometer to calibrate the instrument to increase the error caused by magnetic steel, demagnetization, wire swelling, shrapnel fatigue, balance failure, etc.

5, thermocouple do not pull out at high temperature, in case the coat burst.

6. Keep the furnace clean frequently and remove oxides and other things in the furnace in time.

How to ensure the uniformity of temperature in the use of intelligent muffle furnace?

First of all, before making sure that the temperature is uniform, we need to analyze, what are the reasons for the poor uniformity of temperature in the muffle furnace? Then according to the specific reason to find out the solution and preventive measures.

There are many reasons for the uneven temperature. For example, the distribution of power is not reasonable, the distribution of heating elements is not reasonable, the circuit is broken, the structure of muffle furnace is not reasonable or the sealing is not good, which leads to the excessive local heat loss, so the temperature of box muffle furnace is not even.

Therefore, we should check the tightness of the furnace to make sure the sealing is up to standard. Then make sure the heating element is not broken and improve the structure of the furnace. Aiming at the problem of unreasonable power distribution, we can recalculate and improve the power so as to make the power distribution more reasonable.