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OfflineJohnRainy
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26429847 - 01/12/20 02:50 PM (4 years, 17 days ago)

That's a lot of grain!  How many liters would you say you get in there? 

I fill my jars 3/4 full so 10 of them would be 7.5 litres of grain, how many litres you figure you got going in there?


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: JohnRainy]
    #26429953 - 01/12/20 03:55 PM (4 years, 17 days ago)

I'd say 16 litres. I bet I can get a few more in there...


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26429980 - 01/12/20 04:14 PM (4 years, 17 days ago)

I researched a bit (I am no plumber) and discovered thermal probe compression couplings which ought to be handy.


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26429990 - 01/12/20 04:19 PM (4 years, 17 days ago)



--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


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OfflineJohnRainy
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430012 - 01/12/20 04:43 PM (4 years, 17 days ago)

What ink bird unit you got in mind there?

You know, if you're doing control of this by temperature, you wouldn't need to T the pressure gauge into the mix.  You wouldn't even need it.  As long as that thing shuts off at 121C, you're good to go, right?

If you ran the probe through the steam hole and sealed it right up, you could vent through the pop-up interlock dealee by holding it down until you're satisfied then letting it up and you could walk away at that point.

Only danger would be if the inkbird unit failed.  But you still have the blowout safety plug.


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: JohnRainy]
    #26430020 - 01/12/20 04:45 PM (4 years, 17 days ago)

I dislike removing the bobble function. I want it in addition to the blowout safety plug. But yes, that would work.


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


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OfflineJohnRainy
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430042 - 01/12/20 05:09 PM (4 years, 17 days ago)

No bobble in the sketch.


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: JohnRainy]
    #26430044 - 01/12/20 05:13 PM (4 years, 17 days ago)

my apologies. bobble and safety plug are to remain intact.


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430048 - 01/12/20 05:15 PM (4 years, 17 days ago)



--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430049 - 01/12/20 05:17 PM (4 years, 17 days ago)

There might be some way to have the probe stuck on the exterior of the PC and calibrate the cooler exterior to whatever pressure you desire. But I imagine it would be affected by room temp, unlesssssss you made an insulator over that area of PC surface.

I know there is thermal conducting paste... but is there glue?


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


Edited by tedoro (01/12/20 05:23 PM)


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430061 - 01/12/20 05:30 PM (4 years, 17 days ago)

This holding the probe to the exterior surface of the lid:

https://www.amazon.com/GENNEL-Conductive-Silicone-Adhesive-Compound/dp/B072MSXHJD/ref=sr_1_3?keywords=thermal+conductive+glue&qid=1578875300&sr=8-3

and a patch of fiberglass over the probe.

I think I will play with this for a few runs and see how stable the temp is from run to run.

I'll keep you all posted.


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


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Invisibletramalot
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430068 - 01/12/20 05:34 PM (4 years, 17 days ago)

Quote:

tedoro said:
There might be some way to have the probe stuck on the exterior of the PC and calibrate the cooler exterior to whatever pressure you desire. But I imagine it would be affected by room temp, unlesssssss you made an insulator over that area of PC surface.

I know there is thermal conducting paste... but is there glue?




The problem and I don't really call it a problem is that a controller to do what we really need to do is anywhere from 55 to $100 and I just can't justify it right now where I could buy two more pressure cookers. I do have a secondary idea that would involve and included a timer but then again I run into where I need an scr and when you get done with the heat sink and a fan you've bought yourself half a dozen hot plates or two more pressure cookers...

I love building stuff but I've learned when taking up new hobbies or expanding a hobby into another hobby to stick to the proven stuff first and I desperately want to master SAB & agar before anything else...


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It's the Journey I enjoy!


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Invisibletramalot
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Re: Presto mod to control burner, keeping 15psi... [Re: tramalot]
    #26430075 - 01/12/20 05:41 PM (4 years, 17 days ago)

PS. Do not attach a temperature probe to the outside of the vessel as 1 - if it falls off you'll get a runaway overheat, possible fire and ruined vessel. 2 - you will not get the resolution to maintain steady temperature\pressure as they are directly related.


--------------------
It's the Journey I enjoy!


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OfflineJohnRainy
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Re: Presto mod to control burner, keeping 15psi... [Re: tramalot]
    #26430099 - 01/12/20 05:58 PM (4 years, 17 days ago)

Oh, man.  Surely it can be attached securely. 

Perhaps a sleeve made from a piece of wool glued on the lid with RTV silicone would be good.  It would insulate it and hold it there. 

Im sure something safe can be fashioned.


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tramalot]
    #26430241 - 01/12/20 08:00 PM (4 years, 17 days ago)

Thanks for your concern on external temp probe mounting,

Here's my thoughts.

1) people run their whole pc run with a shitty hot plate on full the entire time. So run away really isn't that big of a deal. Also I am not intending to leave these unattended. The rattling bobble will warn me of problems.

2) What is meant by resolution? Temperature accuracy? That from the outside of the pc, one couldn't get an accurate read of the internal temp, therefore the pressure could never be controlled? If this is a problem, it will surely show up with some harmless testing, where I glue the probe to the lid, cover it with fiberglass, and do a few runs only reading the temp, not running the hot plate with the inkbird. My guess is that it would read a good 5/10 degrees lower than internal temps, but consistantly so. But I could be wrong. So I set the Inkbird for 235f and then it kicks off the burner when its 245f actually and wavers from 14psi to 16psi (depending on how much air I trapped in the PC).


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


Edited by tedoro (01/12/20 08:02 PM)


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430337 - 01/12/20 09:13 PM (4 years, 17 days ago)



REALTIME TESTING!!

Looking pretty promising with this test run. Bleeding the air out for 20 minutes. Reading 212f. I didn't have any thermal paste, so I read Vaseline can work in a pinch. Masking taped tight on the lid, and a big clump of fiberglass insulation on top.


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430364 - 01/12/20 09:31 PM (4 years, 17 days ago)



Really impressive. I brought it up to 15psi and it read 248f about a minute after arriving at 15psi. Thats pretty cool. Alas, I discovered my Inkbird has a max temp of 248 and has a forced alarm at a user set temp (max 248f) so thats annoying. So now I'll be on the lookout for another unit that has a higher max temp.

This is really encouraging! I'm trying to set it to auto hold at say 14psi. Stay tuned.


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


Extras: Filter Print Post Top
Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430397 - 01/12/20 09:56 PM (4 years, 17 days ago)

Well its working fabulous, with the exception that my inkbird controller is annoyingly just out of the temp range of a PC.

I am keeping pressure between 14psi and 16psi, but, the high temp alarm keeps sounding (no way to turn it off).

Also, this is a dummy test with no contents in the PC. I'm curious if a bunch of cold bags of grain with throw this off.

I found this slightly more expensive controller....

https://www.amazon.com/dp/B07M7TSG5W/ref=emc_b_5_t

It might do the trick.


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


Extras: Filter Print Post Top
Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tramalot]
    #26430423 - 01/12/20 10:21 PM (4 years, 16 days ago)

Quote:

tramalot said:
PS. Do not attach a temperature probe to the outside of the vessel as 1 - if it falls off you'll get a runaway overheat, possible fire and ruined vessel. 2 - you will not get the resolution to maintain steady temperature\pressure as they are directly related.




I'm curious about this resolution you speak of. I have my inkbird controller set to 1 degree activation (heating differential value), yet the temp still swings 4 degrees. is that what you mean by resolution?

You know... there is a minute delay for the heat to go through the lid.... and the temp swings further because of that.

I'm also wondering if these 3 psi swings will pop my bags. I doubt it because the cycling of my stove top moves my pressure about that much. (and everything is so much slower with a stuffed PC)


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


Edited by tedoro (01/12/20 10:24 PM)


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430487 - 01/12/20 11:27 PM (4 years, 16 days ago)

I just realized I might be able to adjust the calibration settings to bump the temp just up to keep it at 15-6psi and not trigger the alarm.

I also found a controller like the inkbird for only $16.

https://www.ebay.com/itm/MH2000F-LED-Digital-Display-Temperature-Controller-Thermostat-W-Sensor-Socket/283661726646?hash=item420b8e73b6:g:HfIAAOSwvzFdvOMq

I'll try the calibration workaround in a few days.


--------------------
--------------------
Deep pour soft agar plates-->bags of WBS-->Low Profile Monos
Clean spawn thread | Put a thermometer on your PC


Extras: Filter Print Post Top
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