Understand the composition of the extracted gas, the gas contains no condensable vapor, particle dust, corrosion and so on. When choosing a vacuum pump, it is necessary to know the gas composition and select the appropriate pump for the pumped gas. If the gas contains vapor, particles, and corrosive gases, it should be considered to install auxiliary equipment such as condenser, dust collector in the intake pipeline of the pump.
The working pressure of Roots vacuum unit should meet the requirement of vacuum equipment's limit vacuum and working pressure. Such as: a vacuum drying process requires 10 mmHg (absolute pressure) working pressure, the limit pressure of the selected vacuum pump should be at least 2 mmHg, preferably less than 1 mmHg. Usually the limit pressure of the pump is half to one order of magnitude higher than the working pressure of the vacuum equipment.
Correctly select the working point of Roots vacuum unit. The normal working range of Roots vacuum unit is from maximum suction pressure to limit pressure *5. Example: The normal working range of JZJ2B150-2.1 Roots water ring vacuum unit is 6000Pa~125Pa. The working range is the normal working pressure range after the main pump is opened. The unit has the best efficiency in this working range.
Under its working pressure, the vacuum unit should be able to discharge all the gas produced in the process of vacuum equipment.
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