I know it can’t pull a full vac, but can it still fully purge winterized material? I’m not a production facility, so if I need to leave my materials in the chamber for longer, then that’s fine. Currently I use my chamber mostly with passive vacuum, I’ll run my robinair for 10~ minutes, lock the chamber and let it set for hours. So while the diaphragm pump doesn’t pull as deep of a vacuum, being oil free and comparatively quiet, I’ll be able to run it longer.
Could I use the diaphragm pump with my vacuum flask because it’s relatively low cfm? I’m debating buying a 2l flask. The pump I have for my vacuum flask is small, while my robinair is too much.
I could use the diaphragm pump if I ever get a rotary evaporator
My goal is to get a pump that not as loud, my robinair is around 80db, and preferably dry as the pump is used in my home and I don’t want oil mist
what kind of guages do you use to tell vac level? I have regular compund guages and it goes down to -30 but I dunno if thats a full vac based on microns. It only takes a few mins and I hear you should vac for hours in hvac. I use the sound of the pump to tell more than the guage but im sure my harbor freight pump isnt the best, and its 6 years old.
Full atmosphere is 29.92" Hg and 760,000 microns. Full vacuum is -29.92" Hg and 0 microns.
Compound bourdot gauges able to discriminate between -29.92 and -30" would need a huge face for the scale, so consider it just an approximation. I also noticed that mine periodically required recalibration to zero.
Im not sure, but I think the one I linked has the nomex diaphragms. When I looked up the part number, their only 29hg pump, under the specs, it lists the wetted parts as “ * Wetted Parts 304 Stainless Steel, Aluminum, Nordel®, Nomex®”
Time will tell, pretty sure my wife ordered one already
This is the one I use for vac filtration and rotovap not my oven though. For my oven I use a 12cfm 2 stage rotary vane vacuum pump from ebay and if I’m doing anything etoh related I use my shitty bvv cold trap.
I did end up getting this pump as a Christmas present from the wife, couldn’t return/exchange because she does her Christmas shopping in October…
All in all, I’m happy with the pump. It’s all setup and running, quieter, no oil mist. I ended up getting a 4l vacuum flask, and this thing is almost too much vacuum. With the funnel full it pulls a deep vacuum quickly, pulling the etho through the filter so fast it comes out the funnel foamy. Some residual splash will coat the sides of the flask, but the vacuum doesn’t appear to be enough to suck the etho straight into the pump.
I should probably get a regulator for it though. In the photos it appears to have regulator behind the gauge, but mine did not come with one. I believe this is the one they sell, but I cannot find a photo or diagram anywhere
I ran the pump for roughly 30 hours until then oil appeared none reactive. I hooked up my old robinair to see if a deeper vacuum would stimulate a reaction. Roughly 5-10 tiny bubbles appeared, dissipated within moments. While tilting and running the oil side to side, maybe 5 more tiny bubbles came out. Oil was none reactive again within a few minutes. I figure I’ll do most of the run with my diaphragm pump and I’ll finish with my rotary
I do and I don’t, my main concern is safety since I can’t test my product. I would rather sacrifice terps then hand out product with butane or ethanol in it. This oil is for carts, so I’ll be adding terps back in, I even decarbed in the same chamber.
I use to pull the deepest vac I could with my robinair, seal it off for hours, then pull again like 6-12 hours later, but only for a few minutes. I thought the big guys ran their pumps non stop when purging, heck someone earlier in the thread made a post about it
Plus this is the largest batch I’ve ever done, almost double my usual batch