How to choose a vacuum pump
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As the title suggests: in a chemical engineering laboratory, there are both water jet pumps and rotary vane pumps. However, the vacuum level produced by water jet pumps is low; sometimes I need a vacuum level below 100 Pa. Rotary vane pumps also stop working properly when exposed to a small amount of water vapor or alcohol. Do you have any good suggestions? Additionally, I’m aware of two brands, Airtac and Denial – do you know anything about them?
Consider changing the fluid medium used in the water-driven pump; DOP could be tried. DOP has a very low saturated vapor pressure, but its viscosity is higher than that of water, so the operating temperature may need to be slightly higher. If it is possible to do so, the light components should be removed regularly; otherwise, an excess of these components will prevent the vacuum level from rising.