1. The working pressure of the vacuum pump 275 should meet the ultimate vacuum and working pressure requirements of the vacuum equipment.

　　Usually, the ultimate vacuum degree of the pump is selected to be half to an order of magnitude higher than the working vacuum degree of the vacuum equipment.

　　2. Select the working point of the vacuum pump 275 correctly. Each type of pump has a certain working pressure range; therefore, the working point of the pump should be selected within this range, and it should not be allowed to work for a long time at 25~30mmHg.

　　3. Under its working pressure, the vacuum pump 275 should be able to discharge all the gas generated in the process of the vacuum equipment.

　　4. Correctly combine the vacuum pump. Since the vacuum pump 275 has selective pumping, sometimes one type of pump cannot meet the pumping requirements, and several pumps need to be combined to complement each other to meet the pumping requirements.

　　5. Requirements for oil pollution of vacuum pump 275 equipment. If the equipment is strictly required to be oil-free, various oil-free pumps should be selected.

　　6. Understand the composition of the pumped gas, whether the gas contains condensable vapor, whether there is particle dust, whether it is corrosive, etc.

　　7. How does the oil vapor discharged from the vacuum pump 275 affect the environment?

　　8. Whether the vibration generated by the vacuum pump has any influence on the process and the environment. If the process does not allow, choose a pump without vibration or take anti-vibration measures.

　　9. The price, operation and maintenance cost of the vacuum pump 275.