The purchase of oil-free vacuum pump to determine the work requirements of the vacuum degree, if really in need of high degree, and selection of vacuum pump to higher than the demand of vacuum degree, otherwise it is not up to the requirements of vacuum will fail to work.

其次是无油真空泵抽气速率，选型时就要稍大于所需求的抽气速率，这样就能更好的满足需要。

Followed by the oil free vacuum pump pumping rate, the selection of the pumping rate is slightly greater than the demand, so that better meet the needs of.

**后看抽取的气体有无腐蚀性，有腐蚀的气体会腐蚀泵，必须要用特殊的材质才能满足需求。

In the end, there is no corrosion of the extracted gas, corrosive gas corrosion pump, must use a special material to meet the needs.

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