Open again vacuum pump after confirmation of no air leakage, loosen blue and red hand wheels, pump for another 15 minutes, then lock tight blue and red hand wheels, shut vacuum pump.

• 确认无漏后，再次开启真空泵，松开蓝、红手轮，继续抽15分钟，然后锁紧蓝、红手轮，关闭真空泵。