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Offlinetedoro
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Presto mod to control burner, keeping 15psi...
    #26427946 - 01/11/20 11:42 AM (4 years, 18 days ago)

I'm on a kick keeping my PC bobble silent as I've recently learned that escaping steam is bad for my pre-sealed bags of grain. I want to automate the constant lowering of the burner heat.

I know PC mods are poo poo'd and THIS ISN'T FOR NOOB's. Warning!!!

Has anyone Tee'd off the Presto valve stem and inserted a pressure set AC/kill or a thermostat to regulate a single burners power?

I swear I saw such a Mod here somewhere years ago, but now I can't find it.

* I made a thing regarding this thread...
https://www.shroomery.org/forums/showflat.php/Number/26742520#26742520



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


Edited by tedoro (06/13/20 08:38 PM)


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Offlinerido
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26427954 - 01/11/20 11:48 AM (4 years, 18 days ago)

I think you're over-complicating it. I think it's Bod that glued two quarters to the weight to make it silent at 15 psi and start rocking in the 18-20 range.


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InvisibleSpunkyMonkey88
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26427959 - 01/11/20 11:51 AM (4 years, 18 days ago)

Dude I run my presto dead silent at 16psi just tape 2 quarters on your 15psi weight and then it's just a matter of finding the sweet spot on your burner... shouldnt have to keep lowering it. I cam do a 2hr pressure cycle and spend about 20 mins getting the burner right and 1h40mins not even looking at it cause it's dead stable at 16psi


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InvisibleSpunkyMonkey88
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Re: Presto mod to control burner, keeping 15psi... [Re: rido]
    #26427961 - 01/11/20 11:52 AM (4 years, 18 days ago)

Quote:

rido said:
I think you're over-complicating it. I think it's Bod that glued two quarters to the weight to make it silent at 15 psi and start rocking in the 18-20 range.




Lots of guys do this and it usually will rock at about 17psi ime


Edited by SpunkyMonkey88 (01/11/20 11:53 AM)


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InvisibleStrainsfordaze


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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26427965 - 01/11/20 11:57 AM (4 years, 18 days ago)

Just tape a couple quarters to the top of the weight, it will reduce the noise and steam that comes out as well as raising the psi up to 17 or so.
Pre sealed bags of grain? You don’t need to pre seal them.
To each their own though.


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: Strainsfordaze]
    #26428001 - 01/11/20 12:17 PM (4 years, 18 days ago)

I have over 4 gallons of grain in there. I first bleed it for a good 15 minutes, then put the bobble on (it has been weighted) and bring it to 15psi. Then I cut it to about 60% and it stays there for about an hour, then I need to start lowering the power over the next 90m minutes until it heats the interior of the bag. I'm running a few of these at a time. Just feels like a good thing to automate. If I don't lower the burner in time... pop goes my bags, cause they start boiling along with the PC water.


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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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InvisibleStrainsfordaze


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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26428022 - 01/11/20 12:30 PM (4 years, 18 days ago)

The bags will pop if pre sealed.


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: Strainsfordaze]
    #26428034 - 01/11/20 12:33 PM (4 years, 18 days ago)

Pre-sealing is rad and bags never pop if you don't bleed steam.

Thats why I am asking these questions about automating a Presto.


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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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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26428093 - 01/11/20 01:16 PM (4 years, 18 days ago)

I'm wondering why I couldn't use an affordable InkBird Plug and Play Thermostat to regulate a hotplate. I could tee off the gauge stem and mount the temperature probe there.

I could bring the PC to a boil with the bobble off. then bring it to 15psi. Then use the Inkbird to gradually cycle off the hotplate as the PC requires less and less heat to stay at 245f. And I would manually end the run.

This would make me very happy because I feel like my life is staring at gauges all day.


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


Edited by tedoro (01/11/20 01:42 PM)


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OfflineHighHarles
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26428450 - 01/11/20 04:19 PM (4 years, 18 days ago)

Quote:

tedoro said:
I'm wondering why I couldn't use an affordable InkBird Plug and Play Thermostat to regulate a hotplate. I could tee off the gauge stem and mount the temperature probe there.

I could bring the PC to a boil with the bobble off. then bring it to 15psi. Then use the Inkbird to gradually cycle off the hotplate as the PC requires less and less heat to stay at 245f. And I would manually end the run.

This would make me very happy because I feel like my life is staring at gauges all day.




If you find success please share a tek would love to see this idea evolve


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: HighHarles]
    #26428454 - 01/11/20 04:20 PM (4 years, 18 days ago)

I feel like I've seen it done, but my searches are coming up dry.


--------------------
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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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Offlineshambler
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26428479 - 01/11/20 04:34 PM (4 years, 18 days ago)

what I've always done with my all american pc is when it gets to temp. and the weight starts rattlin, i slowly back off the temp. til it just vents or rattles once every 30 seconds or so. I never drive a pc hard.


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: shambler]
    #26428673 - 01/11/20 07:01 PM (4 years, 18 days ago)

Thats what I do too, but I'm tired of the attention it takes over the three hour run.


--------------------
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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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InvisibleSir Pentinite
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26428692 - 01/11/20 07:15 PM (4 years, 18 days ago)

Quote:

tedoro said:
I'm wondering why I couldn't use an affordable InkBird Plug and Play Thermostat to regulate a hotplate. I could tee off the gauge stem and mount the temperature probe there.

I could bring the PC to a boil with the bobble off. then bring it to 15psi. Then use the Inkbird to gradually cycle off the hotplate as the PC requires less and less heat to stay at 245f. And I would manually end the run.

This would make me very happy because I feel like my life is staring at gauges all day.




I think a PID controller would be better because they are geared more toward fast on/off cycling of a heat source. The caveat is that you will have to mount a thermocouple somewhere and the steam release is probably not an ideal place.


--------------------
"I thought to myself 'Boy, I'm sure glad there's nobody here to see this because this is exactly the sort of thing that gets people riled-up and they assume you're dying and that something has to be done. Where if you're alone, you know, you either come through it or you die, but in any case you avoid the fuss.'"
- Terrence McKenna


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: Sir Pentinite]
    #26428697 - 01/11/20 07:22 PM (4 years, 18 days ago)

But how fast would it need to be really? These Prestos are massive and change temp slowly. I think my Inkbird can set its on/off temp difference. seems 2 or three degrees would be fine. Clicks on and off every few minutes like my home stovetop does when I have it set on medium.

The Presto would function exactly the same as before the mod. I'll be home the whole time. and hell, with a weak hotplate, some people just run the damn thing on high the whole time running the bobble the whole run. So I'm not really sure what I have to lose here.


--------------------
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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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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26428698 - 01/11/20 07:23 PM (4 years, 18 days ago)

I just wished I could find the dude that posted something similar a while back and learn from him.


--------------------
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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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OfflineJohnRainy
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26428998 - 01/12/20 12:34 AM (4 years, 17 days ago)

That's a neat idea.  Im sure it can be done. 

Perhaps instead of teeing off the stem, you could find a pressure switch to put into the lid.


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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26429154 - 01/12/20 05:33 AM (4 years, 17 days ago)

Quote:

tedoro said:
I'm on a kick keeping my PC bobble silent as I've recently learned that escaping steam is bad for my pre-sealed bags of grain. I want to automate the constant lowering of the burner heat.

I know PC mods are poo poo'd and THIS ISN'T FOR NOOB's. Warning!!!

Has anyone Tee'd off the Presto valve stem and inserted a pressure set AC/kill or a thermostat to regulate a single burners power?

I swear I saw such a Mod here somewhere years ago, but now I can't find it.




I'm new and while I'm waiting for spring to get here or at least stable temperatures I've been working on something with a PID controller. Un-fortunately we're dealing with something that's potentially dangerous so I'm not going to go into it in detail but there are some controllers specifically set or designed for slow ramp up and down of temperatures for brewing but it does involve modification of the vessel which is the danger part. That's including the risk of fire, but this should be enough information for you to hopefully find what you're looking for and if I get to something that I feel is safe I'll post more.


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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]
    #26429578 - 01/12/20 11:58 AM (4 years, 17 days ago)

Instrumentation is what we are talking about here.  It's very cool technology, you can control all kinds of processes with it.  I won't pretend to know much about it because I don't. 

Another solution to OP's problem is scrap the bags and use jars or something you don't need all this technology to manage. 

Solving problems is wonderful but eliminating them so they aren't even there to solve is powerful too.


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Offlinetedoro
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Re: Presto mod to control burner, keeping 15psi... [Re: JohnRainy]
    #26429624 - 01/12/20 12:41 PM (4 years, 17 days ago)

Never going back to jars. 4 whole monotubs in one presto. boom.


--------------------
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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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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...


--------------------
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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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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.


--------------------
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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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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.


--------------------
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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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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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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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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


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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


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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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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.


--------------------
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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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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro] * 1
    #26430762 - 01/13/20 07:05 AM (4 years, 16 days ago)

This is bare minimum imo. Ramp control
"Runaway" means you go look for your dog and at best you come back to a dry pot...


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Re: Presto mod to control burner, keeping 15psi... [Re: tramalot]
    #26430811 - 01/13/20 08:14 AM (4 years, 16 days ago)

Any of those cheap 1500w cast iron solid plate burners $30+ may work (longevity) if you set your ramps correctly. The weak spot of the cheap ones is the gauge of the internal and external wiring and the thermostatic control itself. I might be paranoid but I must stress if you don't fully understand ohm's law and how to put an extra circuit breaker in your fuse panel\breaker box don't mess with this stuff...


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Re: Presto mod to control burner, keeping 15psi... [Re: tramalot]
    #26430813 - 01/13/20 08:15 AM (4 years, 16 days ago)

This is the thread you were thinking of, but it sounds like you've already got a good handle on it already! https://www.shroomery.org/forums/showflat.php/Number/22698514

I'm still in for final results :thumbup:


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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26430917 - 01/13/20 09:27 AM (4 years, 16 days ago)

Quote:

tedoro said:
Never going back to jars. 4 whole monotubs in one presto. boom.



Do you need a flow cab for that? That's all that keeps me from switching to bags to be honest. I don't feel confident doing bags in a SAB.



You could try making something like this? I'm not sure what the threads are on a presto but you should be able to find out?


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Re: Presto mod to control burner, keeping 15psi... [Re: tramalot]
    #26430946 - 01/13/20 09:45 AM (4 years, 16 days ago)

Quote:

tramalot said:
This is bare minimum imo. Ramp control
"Runaway" means you go look for your dog and at best you come back to a dry pot...




Again, one can match the hotplates wattage to be not a danger if running on full the whole run. 3 quarts squishing through the bobble wouldn't run dry in three hours. But again, if I hear a bobble, I'd know something is up.

and that ramp controller..... It looks cool, but for partial automation, couldn't my system work pretty well with no ramps? Turn it on, and turn it off? It handles the rest? Hell you could even put an AC timer switch in the mix.


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


Edited by tedoro (01/13/20 09:47 AM)


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Re: Presto mod to control burner, keeping 15psi... [Re: Kimble]
    #26430956 - 01/13/20 09:51 AM (4 years, 16 days ago)

Quote:

Kimble said:
Quote:

tedoro said:
Never going back to jars. 4 whole monotubs in one presto. boom.



Do you need a flow cab for that? That's all that keeps me from switching to bags to be honest. I don't feel confident doing bags in a SAB.



You could try making something like this? I'm not sure what the threads are on a presto but you should be able to find out?




I saw that dudes setup. I really like it, but it still requires me constantly adjusting the stove. people doing bags know what I'm saying. And if I fuck up with that dudes setup and the stopcock blows, my bags are surely blown.

I've moved years ago from jars to bags with the intention of never having a flowhood. I would never advise it. they kinda go hand in hand. I got it down now, with pre-sealed bags and LI syringes.... but yah.


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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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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26431491 - 01/13/20 02:36 PM (4 years, 16 days ago)

I'm running a full load of bags today with the setup. Setting the calibration 4 degrees low avoids the alarm, but, the temp will not register higher than an actual 248 (now 244) So I have the Temperature Set Value at 244f... which clicks the hot plate off (at actually 248 which is around 15.5psi. It drops to 13.5 psi. This was all on a test run this morning. I'm bleeding air out right now and preparing to bring it up to 15psi. Stay tuned.



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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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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26431587 - 01/13/20 03:16 PM (4 years, 16 days ago)

It just ran its first heat cycle at 3minutes 40 second. Its staying between 13.5psi and 15psi. Thats the highest I can run it with this inkbird controller.


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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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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26431601 - 01/13/20 03:20 PM (4 years, 16 days ago)

Id feel like with your PC mods its extremely important that you babysit the thing the entire time. I frequently walk away from my PC runs once they're dialed in. Idk man using a simple bang bang controller and no fail-safes. Feels bad man.

If the worry is simply escaping steam. Run it at 14 or put weight on the weight and run it at 15.


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Re: Presto mod to control burner, keeping 15psi... [Re: bodhisatta]
    #26431630 - 01/13/20 03:31 PM (4 years, 16 days ago)

Quote:

bodhisatta said:
Id feel like with your PC mods its extremely important that you babysit the thing the entire time. I frequently walk away from my PC runs once they're dialed in. Idk man using a simple bang bang controller and no fail-safes. Feels bad man.

If the worry is simply escaping steam. Run it at 14 or put weight on the weight and run it at 15.




I get your concerns. The problem I've been having is that the huge bags take forever to get hot entirely through the bag, and I need to keep creeping the heat down. I read an old quote from RR regarding popping pre-sealed bags.. can't remember it verbatim but he said to make sure not to let the PC lose steam, because that means your bags might be boiling too.

Thus my interest in this.

I was just thinking another way to handle this is to have a kitchen thermometer with a probe taped to the lid, with the alarm set to 250f or whatever 16psi is... then you could jump up and lower the burner if it starts to get too hot.

This is working real nice tho....


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


Edited by tedoro (01/13/20 03:31 PM)


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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26431684 - 01/13/20 03:53 PM (4 years, 16 days ago)

Good luck man. A PID controller and thermo-probe is around 100 for something quality. Of course the PC has its on built in safety features.. if your thermometer probe falls off the cooker lands somewhere room temperature your going to be heating on full power till you notice it or notice the PC blowout plug


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Re: Presto mod to control burner, keeping 15psi... [Re: bodhisatta]
    #26431690 - 01/13/20 04:00 PM (4 years, 16 days ago)

Yep, that is certainly a possibility, or the probe fails. I have a healthy fear of these things.... and if either of those two happen, the bobble with go crazy for over an hour with the 3 quarts of water I got in there.

Its now only going between 14psi and 15psi as the bags warm. Pretty neat.


--------------------
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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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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26431727 - 01/13/20 04:30 PM (4 years, 16 days ago)

A logic controlled switch will "learn" the response of the stove and PC combo and eventually get so good it will do a near perfect job every time getting it up to 14.5 not a bit over and keeping it therr


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Re: Presto mod to control burner, keeping 15psi... [Re: bodhisatta]
    #26431861 - 01/13/20 05:49 PM (4 years, 16 days ago)

I ran the presto PC with four grain bags just now. Worked great. At the end I unplugged the hotplate from the inkbird controller and set the hotplate on low to slow the depressurization.

The first half of the 2.5 hour run was between 14psi and 15 psi... the second half was between 15 psi and 16 psi. the burner was on for between 3.5 minutes (at the beginning) and 2 minutes (at the end)

It was nice to not have to constantly adjust the hot plate.

Proof of concept complete. Not sure if this is a good idea, but its pretty cool.

T


--------------------
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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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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26432721 - 01/14/20 08:05 AM (4 years, 15 days ago)

Awesome. Good job.


--------------------
But if you're in a hurry, and really got to go
If you're in a hurry, might have to find out slow
That it's one thing to try and another to fly
You get there quicker just a step at a time
It's one thing to bark, another to bite
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26742703 - 06/13/20 09:04 PM (3 years, 7 months ago)

Hey,

I bailed on cheaply automating a burner, so I went with this idea.



https://www.shroomery.org/forums/showflat.php/Number/26742520#26742520

It just give temps and can set alarms for respective pressures.

Its been working real nice like.


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


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