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DIY Submersible Temperature Probe DIY Submersible Temperature Probe
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Old 04-04-2007, 01:11 AM   9 links from elsewhere to this Post. Click to view. #1
Yuri_Rage
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Default DIY Submersible Temperature Probe

Finally...Yuri posts a project that anyone can do!

Tools list:
Soldering iron/solder (and the ability to use it)
Hacksaw

Parts list:
Small stainless tube (I used a spare keg dip tube. Stainless brake line would work and is pretty easy to get).
22 ga wire
Heat shrink tubing or electrical tape
Temperature sensor of your choice
Epoxy (J-B Weld or similar - able to withstand up to ~212 degrees F)

Total cost:
Under $10.

How to:
Solder the wire to each pin or output of the temperature sensor. Insulate your work with electrical tape or shrink tubing. Cut a suitable length of stainless tube. Make sure everything fits the way you want it. Mix the epoxy. Put the sensor assembly in the tube, and fill it with epoxy. You can be a little messy - it's easy to sand the excess off after it cures. I found that with J-B Weld, you can wait until it no longer sags under its own weight (about an hour), then put it into boiling water for 10 minutes or so. It hardens right up! No 16 hour wait for cure time.

Notes:
I used an LM34 digital temperature sensor (shown in the middle of the picture) to make a probe for my Mash Monitor project. However, you could use a thermistor, thermocouple, or even an existing non-submersible probe (like the Ranco temp controllers come with).
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Old 04-04-2007, 02:04 AM   #2
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Nice work, Yuri !
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Old 04-04-2007, 02:47 AM   #3
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Nice work, Yuri!

What's the temperature change lag-time like with the sensor packed inside the JB weld?
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Old 04-04-2007, 02:51 AM   #4
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It's a bit slower than my digital probe thermometer, but it's really not all that bad. I intended to time it, but forgot. Something less than 10 seconds from boiling to freezing and vice versa. J-B Weld is ok as a thermal conductor, but it is an electrical insulator - not bad for this job.
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Old 04-04-2007, 02:55 AM   #5
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Dude, who are you? The stuff you make is always so professional looking. I don't even want to think about how this project would turn out if I attempted it.
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Old 04-04-2007, 09:01 AM   #6
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If you are using a ranco type probe I made thermowells with SS tubing and JB weld.

Some aluminun foil plugs


annd JB weld...


the probes slip in the side...
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Old 04-04-2007, 02:47 PM   #7
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I'm really impressed with the dedication and innovation on this board. Its great to see the <strike>hobby</strike> profession move forward like this.
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Fermenting: Red Herring Lager with wrong ingredients.
Aging: Cabernet Sauvignon, Apfelwein, Peach wine (Curve'?)
Bottled/Kegged: Mango wine, Cherry port, Shiraz wine, Ginger Peach ale,
Consumed Brown Ale (Newcastle clone), Blue Moon (Belgian Wit) Thread, Cranberry ale, Corona clone.


Steam Injected Mashing Thread 1 , Thread 2.
Yeast storage by freezing.
8 brews thus far in 2007.

ITS ABOUT THE BEER ! My brewing gallery. Good, free, open source brewing software, QBREW.
Last edited by brewman ! : 04-04-2007 at 03:03 PM.
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Old 04-04-2007, 03:16 PM   #8
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Has anyone located a thermistor equivalent for the probe used on the Love controls temperature switches. Would like to locate a source of thermistors to install in 1/4" SS probes for insertion into fermentors for temperature control.
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Old 04-04-2007, 03:47 PM   #9
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They have them at Cole Parmer
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Old 04-05-2007, 03:12 PM   #10
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Thank you MM for the link, but the probes cole parmer sell are 2.2K ohm not the 1K ohm that Love control uses.
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