1.Vacuum pump, vibration, Qi, relief is automatically completed;
2.Using high precision absolute pressure sensor,instrument and negative pressure vessel pressure up to 3.7 kPa ± 0.3 kPa;
3.A water buffer device, which can prevent the negative pressure container of water into the vacuum pump;
4.A vacuum meter, can directly reflect the working condition of vacuum pump(two) technical parameters:
5.The sample size: 2000g;
6.The maximum aggregate size: 19.1mm;