like @greenbuggy mentioned, asperators reach a point of diminishing returns at a certain size. water heating up will reduce the draw of the unit.
you would better served with a oil less piston or scroll design.
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Agree with previous 2 posters. However I have seen these work well in several labs, but with several considerations.
First, 3 times now Iāve seen these pumps ship with the wrong voltage plug. Make sure that the pump is actually a 110v pump and doesnāt just have a 110v plug.
Second, the colder the water the better the pump works.
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thank you for all that. I will try again tomorrow.
Is there anything wrong with me using a rough pump for the required pressure?
Other than the money spent on this water circulating vacuum pump?
Thats what I assume the Edwards Mechanical Pump is, so I think I can answer my own question with that. Thanks again.
Just make sure that youāre doing something about the vapors that may make it past your condensing coils on the roto (like a cold trap), and keeping up with oil changes - the vapors will dilute the oil in the crankcase of a roughing pump and if you run with solvent-diluted oil for long enough it can wreck bearings and cause other damage to your pump internals
Not to mention completely alter the performance of the pump. A cold trap will improve the performance of most vac pumps in this situation, including the one you are currently using
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I still wonder how to get the most out of that SHB Series Water Circulating Vacuum Pump. I tried cooling the water down with ice but that did nothing. Also tried different hose connections. Still dont know how I can get it to create better pressure.
But I used the rough pump for an hour and that definitely worked.
As you say, I will have to use it cautiously or create an additional cold trap for it so as not to create future problems for that equipment.
So I am on to taking the extraction into the Short Path Distillation process.
Quite a humbling learning experience.
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there is a sweet spot fot the water fill level in those, make sure all your tubeing connection is tight, make sure the pump is wired for the correct voltage like @Future said. You need some some sort of cold trap and ācalibrated leakā if your going to use a high vaccum pump containing oil. If you dont already have ventalation you will want it, specifically for vaccum pump exhausts.
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