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Home Brew Forums > Home Brewing Beer > DIY Projects > Kettles, Mash Tuns, & Hot Liquor Tanks > Inline Thermometer Build - 3/4" - Simple Simple
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Old 02-18-2010, 10:21 PM   #1
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Default Inline Thermometer Build - 3/4" - Simple Simple

This was meant to be similar to the Blichmann Thrumometer, but with a 3/4" bore instead of the smallish 3/8" bore of the commercial product. And, if you don't value your time at all, it is cheaper.

Clicking on pictures gets you the big ones.

Parts list:

  • (1) small fishtank thermometer - $2.29 Petsmart
  • (2) 1/2" NPT female thread x 3/4" slip - $4 ea. Home Depot
  • 1.5" 3/4" copper pipe - scrap bin!

When finished, clear shrink tubing would be best, but I didn't have that. I wrapped a layer of clear shipping tape around it. Haven't tested, but I predict success







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Old 02-19-2010, 02:01 AM   #2
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Nice! Very simple. I like the idea with the copper pieces. I'll definitely use try this out, too.

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Old 02-19-2010, 02:08 AM   #3
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Simple and efficient.

I build a very similar piece for my inline aerator. It's just a copper tee with 1/2" threaded fittings soldered on plus a stainless 2 micron aerator stone.

However, I stuck the thermometer to a thin piece of aluminum flashing that I then velcro'd around the pipe. This is so I later remove the thermometer and boil the assembly for sanitary purposes. Those stick-on thermometers ain't gonna survive boiling water...

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Old 02-19-2010, 03:59 AM   #4
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Quote:
Originally Posted by lamarguy View Post
Those stick-on thermometers ain't gonna survive boiling water...
No, they won't. At least I am sure the tape would let loose.

Mine won't ever be submersed, though. I circulate boiling wort through my whole cooling system for 15 minutes before I turn off the heat. Using a pump, of course. This "thrumometer" will be sanitized in that way. That is also how I sanitze my tubing and plate chiller.
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Old 02-19-2010, 06:31 AM   #5
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Originally Posted by passedpawn View Post
I circulate boiling wort through my whole cooling system for 15 minutes before I turn off the heat. Using a pump, of course. This "thrumometer" will be sanitized in that way. That is also how I sanitze my tubing and plate chiller.
Blichmann specifically says not to heat the "thrumometer" higher that 140F. I imagine all liquid crystal thermometers have a similar maximum temperature. Just sayin'...

Quote:
In no case exceed 140oF as this will permanently damage the liquid crystal temperature elements and cause the thermometer to lose accuracy.
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Old 02-19-2010, 12:08 PM   #6
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Blichmann specifically says not to heat the "thrumometer" higher that 140F. I imagine all liquid crystal thermometers have a similar maximum temperature. Just sayin'...
Errr... I'll run it this wkend and report back.
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Old 02-19-2010, 01:49 PM   #7
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I was thinking of a similar idea or one of these...

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Old 02-19-2010, 02:00 PM   #8
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I was thinking of a similar idea or one of these...
Very very cool. But 70C limit. I really want anything in the "cooled beer path" to be sanitizable by heat.
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Old 02-19-2010, 02:16 PM   #9
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I don't know if the high heat will actually damage the thermometer, but it's sure pretty cheap and easy to find out!
I do think the adhesive will let go when you pass boiling wort through it, though.
Perhaps you could encase the whole thing in clear heat shrink? That'll hold the thermometer to the copper regardless of the adhesive surviving!
Granted you could get nasties under the shrink after washing a few times, but it is on the outside... Maybe the adhesive lined clear heat shrink would be a better way to go?

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What does the primary pressure gauge on the tank tell us? That's right, the temperature. Put it on a scale if you want to know how much is in it...
Put some duct tape over the gauge - Or better yet - Replace the high pressure gauge with a plug - High pressure gauges are useless!
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Old 02-19-2010, 02:27 PM   #10
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Originally Posted by SweetSounds View Post
I don't know if the high heat will actually damage the thermometer, but it's sure pretty cheap and easy to find out!
I do think the adhesive will let go when you pass boiling wort through it, though.
Perhaps you could encase the whole thing in clear heat shrink? That'll hold the thermometer to the copper regardless of the adhesive surviving!
Granted you could get nasties under the shrink after washing a few times, but it is on the outside... Maybe the adhesive lined clear heat shrink would be a better way to go?
yea, I mentioned the shrink tubing in my post. I just couldn't find it quickly. Anyhoo, if the tape fails, I will go and find the tubing.
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