When choosing a vacuum system, the following points should be taken into consideration:
1.Type of Gas to be Extracted and Extraction Volume
Check and determine the type and volume of gas to be extracted as required by the process. Because if the type of gas being pumped reacts with the liquid inside the pump, the pump system will be contaminated. At the same time, it is necessary to consider determining the appropriate exhaust time and the volume of gas generated during the extraction process.
2. Vacuum Degree
It is to determine which structure the product adopts. Vacuum degree has two readings: gauge pressure and absolute pressure. Absolute pressure indicates that the reading is an absolute value, that is, the closer the reading is to '0', the higher the vacuum degree. However, when looking at the gauge pressure, the closer it is to 760mmHɡ, the higher the vacuum degree. If the absolute pressure (ultimate vacuum) you require is close to '0', only a vacuum pump can meet this requirement. But if the requirement is close to 1bar (i.e., atmospheric pressure), then a Roots blower or a centrifugal fan can be selected to meet this requirement.
3. Determine the working vacuum range
First, it is necessary to check and determine the vacuum degree required for each process. Because each process has its applicable vacuum degree range, it must be carefully studied and determined.
4.Vacuum Volume Inspection
Determine the time required to achieve the required vacuum degree, the flow resistance and leakage of the vacuum pipeline. Consider the pumping rate required to maintain the vacuum under certain process requirements after achieving the required vacuum degree.
5. Determine the ultimate vacuum degree
On the basis of determining the vacuum degree required by the process, check the ultimate vacuum degree of the vacuum pump system, as the ultimate vacuum degree of the system determines the optimal working vacuum degree of the system. Generally speaking, the ultimate vacuum degree of the system is 20% lower than the working vacuum degree of the system and 50% lower than the ultimate vacuum degree of the forepump.