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Across International

icdog

icdog

Member
What thermometers can handle being in the vacuum?

I am still struggling with my oven. Had the temp set at 140 and it was there for hours. Put the material in, let it sit for an hour, IR gun said material was at 125F so I turned on the vac, pulled to 750torr, bubbles started forming and a few popped but not much. I turned off the vac pump and let it all sit under vac for awhile. There was very little bubbling, I tested the material and it isn't purged after 2 hours in the oven under vac.

Sorry to ask again but do you guys leave your pump on continuously? AI support said to not leave the pump on as it will wreck it after awhile. I'm not overly concerned about wrecking the pump compared to over vac'ing the material.
I'm using a 3 CFM single stage pump.

Previous to the oven I had a normal vac chamber. I heated up the chamber to around 120F on the outside, turned on the pump and bubbles kept popping. If I turned off the pump the bubbles stopped popping so I'm wondering if this is the problem. I'm pretty certain my vac chamber wasn't as airtight as the oven is.

Any suggestions? I did an auto tune on the oven later on and will try this tomorrow. So far it hasn't been plug and play.
 
Hash Man

Hash Man

Member
Do you have the green contoller with4 buttons? The new low temp unit? If not they will send u one for free. Turn your pump off so u dont go over -29.5. Do not overlook -29.5 for your own sake . U will cold boil your thca into thc and never get the good stuff.

I use a kitchen meat thermometer and an it temp gun. U can use the regular analog thermometer/humidistat(?spelling) u get at the hydro store.
 
R

rb extractors

Member
you need to run your pump in order to purge. I suppose you could purge not using a hard vac, but it would take a long time. are you letting your oil cool before putting it in your oven? your temps are way too high
 
N

nakadashi

Member
Hash Man said:
Do you have the green contoller with4 buttons? The new low temp unit? If not they will send u one for free. Turn your pump off so u dont go over -29.5. Do not overlook -29.5 for your own sake . U will cold boil your thca into thc and never get the good stuff.

I use a kitchen meat thermometer and an it temp gun. U can use the regular analog thermometer/humidistat(?spelling) u get at the hydro store.
Click to expand...
Doesn't the butane escaping from the slab change your 29.5"hg to something higher?
 
N

nakadashi

Member
RegisPhilburn1 said:
It should lower it a little bit, the evaporating butane will also have a slight cooling effect on the slab (think refrigeration)
Click to expand...
Sorry that was not worded very clearly, I was not referring to temperature. I meant "higher" as in 29.5"hg to say 29.4"hg because there is less vacuum and more butane.
 
icdog

icdog

Member
Rb you said my pump might not have enough oomph and I need to know if your right so I can buy another one if I have too. Its a single stage 3cfm which is the same CFM pump offered by AI as an option.

According to the torr gauge the pump pulls down to 760 which is pretty low. Even at that level with the pump on there is very little bubbling. Is it possible that a pump seems to pull a vac at that level but it isn't for some reason?
The pump pulls down vac pretty quickly and doesn't seem to have any issues.
Does a higher cfm pump pull a stronger vac but at a same level of vac somehow?
 
UNREGISTRD

UNREGISTRD

Active member
icdog said:
Rb you said my pump might not have enough oomph and I need to know if your right so I can buy another one if I have too. Its a single stage 3cfm which is the same CFM pump offered by AI as an option.

According to the torr gauge the pump pulls down to 760 which is pretty low. Even at that level with the pump on there is very little bubbling. Is it possible that a pump seems to pull a vac at that level but it isn't for some reason?
The pump pulls down vac pretty quickly and doesn't seem to have any issues.
Does a higher cfm pump pull a stronger vac but at a same level of vac somehow?
Click to expand...

I would def upgrade your pump.. We bought the 1.9 oven/pump combo and regret the purchase of little toy vac we have sitting as a paper weight.. AI didnt even offer to return it after admitting it is a subpar pump for the 1.9 oven..
 
Aeroguerilla

Aeroguerilla

I’m God’s solider, devil’s apostle
Veteran
I been running my ai 1.9 for a few weeks now. I've figured out a few tricks. After extraction I place Pyrex in oven set it at 130 and bubble off most butane so the oil becomes thick viscosity. The thicker the viscosity before purge then the quicker it honeycomb. I've been getting honeycomb in 8 hours when it's properly heated before purge. Also i find that if you make it to dry before purge it will turn to crumble. I prefer a thick oil one that does not run. If it's running at all when it goes under vac it takes much much longer. I got honeycomb just forming on a batch that was way to runny 48hours later compared to 8 hours same batch when brought to preferred viscosity. Also been getting killer shatter takes about 4 days never over 96 not continually purging 6hours on then I let rest at charge for 6. Hopefully this helps I'll post up pictures later cheers
 
Hash Man

Hash Man

Member
I had to recalibrate my oven again, its hot outside today and my house is at 75 degrees. Had to adjust my pk from -42 to -30 to keep my set temp and actual temp equal.
 
icdog

icdog

Member
So what cfm and single or dual stage vac pump should I get for the 0.9 cuft oven.
I'm not sure I can get a e2m30. RB is there a reason you use that pump?
 
Aeroguerilla

Aeroguerilla

I’m God’s solider, devil’s apostle
Veteran
Temperature is constantly changing here and I don't get much fluctuation. I also have quartz slab in there. Try the smaller Pyrex dishes they heat up to the exact reading on pv
 
Gray Wolf

Gray Wolf

A Posse ad Esse. From Possibility to realization.
Mentor
ICMag Donor
Veteran
icdog said:
So what cfm and single or dual stage vac pump should I get for the 0.9 cuft oven.
I'm not sure I can get a e2m30. RB is there a reason you use that pump?
Click to expand...

I prefer larger pumps for the speed, even though a smaller pump may suffice with more time.

Even a single stage will still peg the Hg gauge and our CPS VP6S was factory tested at 65 microns. Our dual stage Robinair was factory tested at 25 microns, which is way too low, is noisier, and puts out considerably more vapor.
 
icdog

icdog

Member
Thats what i was wondering. The pump doesn't take long to get to 750 torr, maby a minute or a bit more, its not like 20 minutes. How much faster is needed.

Did more testing today. Still cold but within the operation temps of the AI. My shelves are 1/8" aluminum, I put an inch thick piece of granite on another shelf and put a shelf on top of that granite and let the oven sit for a day to warm it all up.

Put material in and let it warm up for an hour. After that I tested the temp which was approx 115 all over. Pulled vac down to 750 torr and lots of bubbles came out. I left it for an hour or so. The vac pump was off, I then turned it on and left it on for about half an hour, lots of bubbles at first but it tapered off after awhile. Turned off the vac pump and left it for another hour, more bubbles but not a huge amount.
The torr gauge needle was a bit below 760 for awhile. I'd love to know if this is really a lower vac and not what I should be doing because it seems to be working now. If RB leaves his vac pump on wouldn't his be pulling a really low vac constantly?
 
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