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When selecting the vacuum pump, the adhering to matters shall be observed:The functioning strain of vacuum pump should meet the needs of limit vacuum and operating pressure of vacuum tools. For example, vacuum coating requires a vacuum degree of one × 10-5mmhg, and the vacuum degree of the chosen vacuum pump shall be at the very least 5 × 10-6mmhg. Generally, the vacuum diploma of the pump is 50 percent to one particular get of magnitude greater than that of the vacuum gear.Pick the working point of vacuum pump appropriately. Every sort of pump has a certain functioning force variety, for instance: the diffusion pump is 10-three ~ 10-7mmhg. In these kinds of a broad stress range, the pumping velocity of the pump alterations with the strain, and its stable working pressure selection is five × ten-four ~ 5 × 10-6mmhg. As a result, the operating level of the pump need to be picked inside this range, and it can't be permitted to work for a lengthy time under 10-8mmhg. Yet vacuum flange in point is that titanium sublimation pump can perform at 10-2mmhg, but its functioning strain ought to be much less than 1 × ten-5mmhg.Below its working pressure, the vacuum pump need to be ready to discharge all the gas produced in the process of vacuum products.Mix the vacuum pump properly. Since of the selective pumping of vacuum pump, sometimes picking one particular pump can not meet up with the pumping needs. A number of pumps want to be blended to supplement every single other to meet up with the pumping specifications. For instance, the titanium sublimation pump has a quite high pumping pace for hydrogen, but it can’t pump helium, even though the 3 pole sputtering ion pump (or the two pole asymmetrical cathode sputtering ion pump) has a particular pumping velocity for argon, and the mixture of the two will make the vacuum device get a far better vacuum degree. In addition, some vacuum pumps can not work under atmospheric stress and want pre vacuum some vacuum pumps need pre stage pumps due to the fact the outlet stress is reduce than atmospheric stress, so they need to be merged for use.Needs of vacuum gear for oil air pollution. If the equipment is strictly oil-free, various oil pumps need to be selected, this kind of as: h2o ring pump, molecular sieve adsorption pump, sputtering ion pump, reduced temperature pump, and so forth. If the demands are not stringent, oil pump can be picked, and some anti oil pollution steps, such as cold trap, baffle, oil entice, and so on., can also satisfy the needs of cleanse vacuum.Know the composition of the extracted fuel, including no condensable vapor, particle dust, corrosiveness, etc. When selecting a vacuum pump, it is necessary to know the fuel composition and choose the corresponding pump for the extracted fuel. If the gas contains steam, particles and corrosive fuel, auxiliary equipment, such as condenser, dust remover, and so forth., shall be mounted on the air inlet pipeline of the pump.How does the oil vapor discharged from the vacuum pump affect the environment. If the setting is not permitted to be polluted, the oil-cost-free vacuum pump can be chosen, or the oil vapor can be discharged to the outside. Coating Equipment whether the vibration made throughout the operation of vacuum pump affects the approach and environment. If glove box parts is not allowed, the pump without vibration shall be picked or anti vibration steps shall be taken.Cost, operation and upkeep value of vacuum pump