we get that you’re new here. trying to HELP.
you were not making it easy.
you did not. the ONLY posts you have made are in THIS thread.
you might want to read them again…I don’t see ANY that were not relevant to your initial post. I agree you’re not ready for adding a vfd to your pump, but it is absolutely relevant to not sucking too hard on your rotovap (which causes solvent to get past your condenser and to the pump).
THAT is correct pump choice…
NO IT HASN’T.
no modifications are necessary to achieve that. you’ve also been told what can happen with a pump that refuses to spit the liqour out…
a cold trap will solve it. Edit: plus a controlled leak
you got that right…but it is more appropriate than using the em30
if you’re giving up on your rotovap and want help with a -80, you might want to start a NEW thread.