1. The workpiece is placed in a vacuum box for vacuuming to remove the gas components that can be extracted from the material of the workpiece. If the workpiece is heated first, the gas will expand when heated. Due to the very good tightness of the vacuum box, the huge pressure generated by the expanding gas may burst the observation window tempered glass. This is a potential danger. You can avoid this danger by following the procedure of evacuating first and then heating up.
2. If you operate according to the procedure of first heating and then vacuuming, when the heated air is drawn by the vacuum pump, the heat will inevitably be brought to the vacuum pump, which will cause the temperature of the vacuum pump to rise too high, which may reduce the efficiency of the vacuum pump.
3. The heated gas is directed to the vacuum pressure gauge, and the vacuum pressure gauge will generate a temperature rise. If the temperature rise exceeds the operating temperature range specified by the vacuum pressure gauge, it may cause the value error of the vacuum pressure gauge.
4. The correct method of use should be evacuated before heating up. After the rated temperature is reached, if it is found that the degree of vacuum has dropped, then add more pumping. This is beneficial to prolong the service life of the equipment.
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