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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, 1 month 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, 1 month 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, 1 month 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, 1 month 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


Registered: 05/10/18
Posts: 669
Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26427965 - 01/11/20 11:57 AM (4 years, 1 month 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, 1 month 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.


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


Registered: 05/10/18
Posts: 669
Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26428022 - 01/11/20 12:30 PM (4 years, 1 month 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, 1 month 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.


--------------------
--------------------
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, 1 month 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, 1 month 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, 1 month ago)

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


--------------------
--------------------
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, 1 month 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, 1 month ago)

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


--------------------
--------------------
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, 1 month 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, 1 month 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.


--------------------
--------------------
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]
    #26428698 - 01/11/20 07:23 PM (4 years, 1 month ago)

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


--------------------
--------------------
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, 1 month 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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Invisibletramalot
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Re: Presto mod to control burner, keeping 15psi... [Re: tedoro]
    #26429154 - 01/12/20 05:33 AM (4 years, 1 month 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.


--------------------
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, 1 month 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, 1 month ago)

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


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