Kegconnection Complete Starter Kit and More Giveaway!


Home Brew Forums > Home Brewing Beer > Electric Brewing > HLT Low Water Alarm/shutoff

Reply
 
LinkBack Thread Tools
Old 02-15-2011, 02:35 PM   #1
dtfeld
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2010
Location: ATL, GA
Posts: 111
Liked 4 Times on 4 Posts
Likes Given: 1

Default HLT Low Water Alarm/shutoff

I've blown a couple heater elements in my HLT by running it partially submerged or dry. Stupid. I want to put a little automatioin on it, but want some input.

I currently have a 10 gal cooler, so I thought about epoxying a capacitive prox to the inner wall and tuning it to "see" the water behind it.

However, going to an all SS 10 gallon system, and a capacitive prox won't work thru a metal wall. I'm thinking about something on a sight glass, but finding something small enough and mounting issues are problematic. I thought I could wire it in series with the main power heater relay to interupt power to the heating element if water goes below the set level.

Has anyone added this safety feature? What did you use and how did you wire it in? As always, pitures appreciated.

__________________
dtfeld is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 02:36 PM   #2
IrregularPulse
Hobby Collector
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
IrregularPulse's Avatar
Recipes 
 
Join Date: Nov 2007
Posts: 42,248
Liked 2754 Times on 2705 Posts
Likes Given: 113

Default

You want a float switch wired in series with your control signal from the PID to the SSR.

__________________
Tap Room Hobo

I should have stuck to four fingers in Vegas. :o - marubozo
IrregularPulse is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 02:38 PM   #3
Cpt_Kirks
Feedback Score: 0 reviews
Recipes 
 
Join Date: Sep 2008
Location: Lakeland TN
Posts: 3,738
Liked 44 Times on 39 Posts

Default

I never run the elements in my HLT when the drain valve is open. If you follow that rule, maybe some kind of switch connected to the valve?

ETA: Also, I have seen a two probe water level sensor that uses the metal pot as the common. I will look for the link when I get home.

__________________
Cpt_Kirks is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 02:39 PM   #4
dtfeld
Feedback Score: 0 reviews
Recipes 
 
Join Date: Aug 2010
Location: ATL, GA
Posts: 111
Liked 4 Times on 4 Posts
Likes Given: 1

Default

Float switch... Interesting. Have you sourced a food grade version?

Also, was trying not to have to cut another mounting hole in the thing. Prox switches are a "shoot through" solution.

__________________
dtfeld is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 03:16 PM   #5
bruin_ale
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2009
Location: Campbell, CA
Posts: 1,433
Liked 15 Times on 15 Posts

Default

Quote:
Originally Posted by Cpt_Kirks View Post
I never run the elements in my HLT when the drain valve is open. If you follow that rule, maybe some kind of switch connected to the valve?

ETA: Also, I have seen a two probe water level sensor that uses the metal pot as the common. I will look for the link when I get home.
Do you fly sparge? You don't lose heat during that? I haven't got my system up yet, but fully intend to run the HLT element while sparging to keep the temp of the sparge water where I want it. On my old propane system I only had a single burner, so while I was sparging I would move the burner to my boil kettle and get the boil started. By the time I was done sparging, the sparge water was probably 110-120 degrees at best.
__________________
bruin_ale is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 03:19 PM   #6
bruin_ale
Feedback Score: 0 reviews
Recipes 
 
Join Date: May 2009
Location: Campbell, CA
Posts: 1,433
Liked 15 Times on 15 Posts

Default

Quote:
Originally Posted by dtfeld View Post
Float switch... Interesting. Have you sourced a food grade version?

Also, was trying not to have to cut another mounting hole in the thing. Prox switches are a "shoot through" solution.
http://www.oscsys.com/Stainless-Float-Switch.html

I think I've seen the same on e-bay for about $10..
__________________
bruin_ale is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 03:20 PM   #7
IrregularPulse
Hobby Collector
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
IrregularPulse's Avatar
Recipes 
 
Join Date: Nov 2007
Posts: 42,248
Liked 2754 Times on 2705 Posts
Likes Given: 113

Default

Quote:
Originally Posted by dtfeld View Post
Float switch... Interesting. Have you sourced a food grade version?

Also, was trying not to have to cut another mounting hole in the thing. Prox switches are a "shoot through" solution.
as in shoot through the wall of the cooler and detect water level? I admit I have limited experience with them, but have worked with them in the field and have never seen an application where a proximity switch shoots through a wall and sees something. It would see the wall and register. (In my limited experience)
__________________
Tap Room Hobo

I should have stuck to four fingers in Vegas. :o - marubozo
IrregularPulse is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 03:25 PM   #8
IrregularPulse
Hobby Collector
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
IrregularPulse's Avatar
Recipes 
 
Join Date: Nov 2007
Posts: 42,248
Liked 2754 Times on 2705 Posts
Likes Given: 113

Default

This one appears to be used in coffee urns so I would say food safe and likely temperature cooperative. Not a lot of info on it but you could probably get more details by contacting them.
__________________
Tap Room Hobo

I should have stuck to four fingers in Vegas. :o - marubozo
IrregularPulse is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 03:26 PM   #9
IrregularPulse
Hobby Collector
HBT_LIFETIMESUPPORTER.png
Feedback Score: 0 reviews
 
IrregularPulse's Avatar
Recipes 
 
Join Date: Nov 2007
Posts: 42,248
Liked 2754 Times on 2705 Posts
Likes Given: 113

Default

Quote:
Originally Posted by bruin_ale View Post
http://www.oscsys.com/Stainless-Float-Switch.html

I think I've seen the same on e-bay for about $10..
Wow cool find. You can get a dented (damaged) version for $8.99
__________________
Tap Room Hobo

I should have stuck to four fingers in Vegas. :o - marubozo
IrregularPulse is offline
 
Reply With Quote Quick reply to this message
Old 02-15-2011, 03:34 PM   #10
carloski44
Feedback Score: 0 reviews
Recipes 
 
Join Date: Apr 2009
Location: Picayune Mississippi
Posts: 30
Default

This maybe what your looking for Kind of pricey at $135.00 from Automationdirect.com
http://www.automationdirect.com/stat...rox30mmuhz.pdf
A ultrasonic proximity sensor can measure fluid levels from the top down, would make a great little addition to an HMI screen to show liquid level in the HLT.
Let me know if you go that route how it works out for you I have played with them a little here and there but never actually used it in a application.

__________________
carloski44 is offline
 
Reply With Quote Quick reply to this message
Reply


Quick Reply
Message:
Options
Thread Tools


Similar Threads
Thread Thread Starter Forum Replies Last Post
Marshalltown bucket water heaters milldoggy Electric Brewing 11 09-24-2012 11:34 AM
E-HLT question (water heater element/plastic cooler) RootvonRoot Electric Brewing 7 02-22-2011 12:35 PM