When using a vacuum oven to test products, you need to pay attention to the following points:
1. The sample is placed in a vacuum oven and vacuumed to remove the air components that can be extracted from the material of the sample. If the sample is heated first, the air will expand when heated. Since the sealing of the vacuum oven is very good, the huge pressure generated by the expanding air may cause the tempered glass of the observation window to burst. This is a potential danger. This danger can be avoided by following the procedure of vacuuming first and then raising the temperature.
2. If the heated air is pumped out by the vacuum pump according to the procedure of heating first and then vacuuming, the heat will inevitably be brought to the vacuum pump, causing the temperature of the vacuum pump to rise too high and possibly reducing the efficiency of the vacuum pump.
3. The heated air is directed to the vacuum pressure gauge, and the vacuum pressure gauge will generate a temperature rise. If the temperature rise exceeds the specified operating temperature range of the vacuum pressure gauge, it may cause an indication error in the vacuum pressure gauge.
The correct way to use of vacuum oven is to vacuum first and then heat it up. After reaching the rated temperature, if you find that the vacuum degree has dropped, add some more vacuum.
