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 laughingdog
Stranger
Registered: 03/14/04
Posts: 4,830
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 Re: Converting an AA PC to an automated electric PC  [Re: Gr0wer]
#23024308 - 03/19/16 07:06 PM (8 years, 29 days ago) |
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Quote:
Gr0wer said:
Thread complete. Any questions? Comments?
You are obviously very clever and determined.
I would guess you are only posting to yourself, (at this point, with this exception) because of the very unlikely, but possible dire consequences. At the least you might consider a (properly rated) surge control, to lower the likely hood of the controller malfunctioning. The likely hood of accident when unwatched may be extremly miniscule, but the possible consequences would seem potentially catastrophic.
Then again most of us here aren't no rope rock climbers, etc.
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 Gr0wer
always improving
Registered: 09/16/03
Posts: 6,056
Loc: El Paso, TX 
Last seen: 6 years, 1 month
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Re: Converting an AA PC to an automated electric PC [Re: laughingdog]
#23024421 - 03/19/16 07:39 PM (8 years, 29 days ago) |
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Yea mostly posting for future reference for myself, like the settings etc. I doubt many people have interest in dropping another $200 on a $400 pressure cooker.
The heater is such a low BTU that the last two weeks i was just directly plugging in the burner at 100% duty cycle to run it. The rocker was going like mad the whole time but the PSI still didn't go over 17. So even if the relay stuck or PID stuck on it wouldnt mean a catastrophic event. Even though it's automated i only run it while im home. And typically im in and out of the garage through the cycle and keeping an eye/ear out for it.
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laughingdog
Stranger
Registered: 03/14/04
Posts: 4,830
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Re: Converting an AA PC to an automated electric PC [Re: Gr0wer]
#23024491 - 03/19/16 08:03 PM (8 years, 29 days ago) |
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Gr0wer
always improving
Registered: 09/16/03
Posts: 6,056
Loc: El Paso, TX
Last seen: 6 years, 1 month
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Re: Converting an AA PC to an automated electric PC [Re: laughingdog]
#23088063 - 04/05/16 09:41 PM (8 years, 12 days ago) |
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Slight change of plans. Swapping to a stopcock, which also means i'll need a pressure switch to interrupt the SSR signal voltage. So i ordered all the supplies and ill rig it up next week. Later i plan to add a relief valve using a normally closed valve that i can actuate in step 1 until the temp probe reads ~203-205F releasing all the air.
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Jerjer
Level 3 Moron
Registered: 12/25/17
Posts: 9
Loc: Austin
Last seen: 5 years, 8 months
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 Re: Converting an AA (or any) PC to an automated electric PC [Re: Gr0wer]
#25099553 - 03/29/18 01:07 PM (6 years, 19 days ago) |
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Gr0wer, thanks for this post (and howdy from Austin). It inspired me to build my own autoclave control.
I bought my burner based on this post. It's supposedly 1500W, but my meter shows 10.3A, not sure why. It takes about 55 minutes, including a 10 minute flush, to heat the empty (except for 3 qts. water) PC to 15PSI from room temp with the burner at 100% (my control doesn't cycle the burner like the original thermostat did).
Before I ripped the burner apart, I tested it out of the box. I saw the same thing you did, where the thermostat cycled the burner on and off even while heating up. There was definitely some issue with it, since it blew its thermal fuse. (Read more about that mess here.) I think your holes that allow air flow are absolutely necessary.
Also, it seemed like heat transfer from the burner to the PC wasn't that great. I bypassed the thermostat like you did to keep the burner on 100%, and I pulled off the PC for a moment (probably at 60 deg. C), and half the burner was red hot.
In the current version, the burner element has been removed and put into an aluminum frame that holds it and the PC together. Some Thermagon heat conductive pad sandwiched between the burner and PC seems to improve heat transfer, judging by a thermistor stuck into the Thermagon that never reads higher than 160 deg. C. That feels pretty comforting.
--------------------
Just getting started!
Open source autoclave control
Fill in the blanks:
OP: "I know __X__ is the standard practice, but I want to try __Y__ because it's new and fun!"
Reply 1: "Just do __X__. Don't do __Y__."
Reply 2: "Use the __X__ tek. It works for me 99% of the time!"
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tedoro
ToadStool Tender
Registered: 02/06/15
Posts: 2,215
Last seen: 16 hours, 35 minutes
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Re: Converting an AA (or any) PC to an automated electric PC [Re: Gr0wer]
#26428340 - 01/11/20 03:18 PM (4 years, 3 months ago) |
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I know this is a tad old, but us PC modd'n peeps gotta hang together.
Question: Is there anything keeping me from tee'ing off the gauge stem on my Presto 23 and inserting the temp probe of a cheap inkbird controller that would then cycle my hot plate to keep the contents at 245f? I'm willing to bleed steam at the beginning and then end the run manually.
https://www.amazon.com/Inkbird-Max-1200W-Temperature-Controller-Greenhouse/dp/B01HXM5UAC/ref=asc_df_B01HXM5UAC/?tag=hyprod-20&linkCode=df0&hvadid=198101685250&hvpos=1o1&hvnetw=g&hvrand=6239012996809999247&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032938&hvtargid=pla-318107594620&psc=1
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Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC
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bodhisatta  
Smurf real estate agent
Registered: 04/30/13
Posts: 61,891
Loc: Milky way
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Re: Converting an AA (or any) PC to an automated electric PC [Re: tedoro]
#26428428 - 01/11/20 04:03 PM (4 years, 3 months ago) |
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I would not use a thermostat especially a cheap one like that. Any bang-bang controller is going to suck with a hotplate and PC both having great thermal mass. You want a PID controller
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Kimble
Idiot
Registered: 03/08/18
Posts: 508
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Re: Converting an AA PC to an automated electric PC [Re: MasterPython]
#26428464 - 01/11/20 04:25 PM (4 years, 3 months ago) |
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Quote:
MasterPython said:
My thoughts on this idea as a machinist with no real experience in pressure vessels my concerns are:
The bottom of the PC is not very thick so there will not be a lot of threads to cut. The possibility of having the aluminum threads shear off when the thing pressures up is real. Maybe it will work, maybe you need a helicoil or maybe this is just a bad idea all together. Any engineers willing to weigh in?
Aluminum and steel can react when bolted together in wet environments causing corrosion.
Is it OK to run that element partly submerged or does it need to be submerged to work safely? If it needs to be submerged you will have to have 2-3 inches of water in your PC to run it.
If you use an npt thread which is tapered, you could install anything from the inside so that the pressure pushes the male thread into the tapered hole as a wedge. Does that make sense?
I'm also a machinist so i have some experience with this stuff.
Also galvanic reactions occur in the presence of electrolytes so using distilled or deionised water should help.
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rm1024
Familiar Stranger
Registered: 11/05/18
Posts: 62
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Re: Converting an AA PC to an automated electric PC [Re: Kimble]
#26477492 - 02/09/20 07:18 PM (4 years, 2 months ago) |
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nice clean work grower. I admit I would not mess with the vessel itself (well, maybe but Im coded to work on vessels) but the controllers and electrical is super cool man. keep up with all the interesting work!
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tedoro
ToadStool Tender
Registered: 02/06/15
Posts: 2,215
Last seen: 16 hours, 35 minutes
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Re: Converting an AA (or any) PC to an automated electric PC [Re: tedoro]
#26742698 - 06/13/20 09:00 PM (3 years, 9 months ago) |
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--------------------
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Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC
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Dewyuck
Stranger
Registered: 09/30/18
Posts: 32
Last seen: 2 months, 26 days
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Re: Converting an AA (or any) PC to an automated electric PC [Re: tedoro]
#26793470 - 06/29/20 11:23 PM (3 years, 9 months ago) |
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Ok I just have to add to this 5 year old thread haha. Here’s how I built my automatic electric pc. Only thing I didn’t add was a timer. Plug it in and away it goes to 121°c 15psi every time without a problem. It pretty much looks like something from Rick and Morty. https://www.shroomery.org/forums/showflat.php/Number/26621248
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zacmasters7
Stranger
Registered: 11/10/20
Posts: 31
Last seen: 3 years, 28 days
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Re: Converting an AA PC to an automated electric PC [Re: Gr0wer]
#27047264 - 11/19/20 12:19 PM (3 years, 4 months ago) |
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yes, I have a question. I watched your vids on youtube. Why do you set the PID at 240F and not 250F. Isn't 15psi equal to 250F?
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Jbfrustraited
Stranger
Registered: 11/17/20
Posts: 20
Last seen: 3 years, 1 month
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Re: Converting an AA PC to an automated electric PC [Re: zacmasters7]
#27084985 - 12/12/20 03:02 AM (3 years, 4 months ago) |
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I have a 25x and I'm sick of buying parts for it so I just put it on a hot plate now. good luck drilling into that nice pressure cooker I would recommend that if you do it do not stay in the room ever with it while it is pressurized. the the manufacturer of those electric cookers may have molded them with a hole
in it or at least the manufacturer knew the precise safe place to drill the hole. Stay safe
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bodhisatta
Smurf real estate agent
Registered: 04/30/13
Posts: 61,891
Loc: Milky way
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Re: Converting an AA PC to an automated electric PC [Re: Jbfrustraited]
#27085050 - 12/12/20 05:18 AM (3 years, 4 months ago) |
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A plastic soda bottle holds over 100 psi. granted steam is different than air pressure but 15 psi is something you can hold back with a couple pieces of tin foil to make a burst disk.
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