① observe the vacuum pump oil situation at any time and found that vacuum pumpoil emulsion must be replaced immediately.

② According to the pumping gas contained in the level of moisture and the levelof vacuum required, be sure to adjust the valve to the appropriate location.

③ pumping gas into the water content can not be too high, if the gas pumping highwater content, before entering the vacuum pump must be installed effectivecooler to reduce the amount of water into the vacuum pump gas to avoid thevacuum pump