1、 Reasons and solutions for the inability to vacuum the vacuum drying oven
1. The vent valve on the panel of the vacuum drying oven is not closed; Solution: Close the vent valve;
2. The vacuum valve on the panel is not open; Solution: Open the vacuum valve;
3. The vacuum pump suction pipe is not connected properly; Solution: Connect the exhaust pipe of the drying oven;
4. The vacuum pump is broken; Solution: Replace the vacuum pump;
5. The door of the drying oven is not tightly closed; Solution: Close the door of the vacuum drying oven tightly;
6. The rubber sealing ring of the box door is damaged; Solution: Replace the sealing ring of the box door;
7. The vacuum gauge on the panel is broken; Solution: Replace the vacuum gauge of the vacuum drying oven.
2、 The solution to the temperature error between inside and outside the vacuum drying oven
The general electric vacuum drying oven adopts the method of heating the vacuum chamber wall first, and then radiating heating from the wall to the workpiece. In this way, the temperature sensor of the temperature control instrument can be arranged on the outer wall of the vacuum chamber. Sensors can simultaneously receive convection, conduction, and radiation heat. The glass rod thermometer in the vacuum chamber can only accept radiant heat, and because the blackness of the glass rod cannot reach 1, a considerable part of the radiant heat is refracted. Therefore, the temperature value reflected by the glass rod thermometer is definitely lower than the temperature reading of the instrument. Generally speaking, it is normal for the temperature reading of the instrument to differ from the reading of the glass rod thermometer by less than 30 ℃ under the working condition of 200 ℃. If the temperature sensor of the temperature control instrument is arranged in the vacuum chamber, the difference between the temperature value of the glass rod thermometer and the temperature reading of the instrument can be appropriately reduced, but it cannot be eliminated, and the sealing reliability of the vacuum chamber increases a potentially unreliable link. If you don't want to see this difference from a practical operational perspective, you can use the display correction function of the temperature control instrument to solve it.
3、 Solution for vacuum drying oven door not opening
The vacuum drying oven has a door that cannot be opened or the door cannot be opened flexibly. Actually, this is normal and not a malfunction. Customers don't have to worry. Due to the sealing properties of the vacuum drying oven, after the vacuum is applied, the door will tightly adhere to the frame. Due to external pressure, the door cannot be opened. Furthermore, due to the double-layer sealing ring on the door of the vacuum drying oven, it can be opened by gently pressing or shaking it on the side.