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Old 04-22-2011, 02:39 AM   #1
quigsnshad
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Default A419 probe waterproof?

I just wired the Johnson A419 temp. controller and the probe doesn't look too watertight. Any problems if I silicone the wired end where the crimp is? Plan on placing this in a glass or a gel pack and don't wanna ruin it.

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Old 04-22-2011, 02:46 PM   #2
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Rather than waterproofing it and placing it "wet" for a buffer. I think a similar buffer can be achieved by insulating it dry w/ paper towels or bubble wrap. I think I just read of someone using dryer lint to pack the probe inside of a glass vial. I just wrap the probe w/ paper towel and tape some plastic wrap over it to keep it from getting damp.

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Old 04-23-2011, 02:44 PM   #3
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I insulate my probe with foam insulation (the pink foamboard stuff) and I think I'm going to have to replace my probe. It's now 2-3 degrees off from other thermometers. I was thinking about putting some silicone sealant around the new one.

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Old 04-23-2011, 03:37 PM   #4
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Quote:
Originally Posted by quigsnshad View Post
I just wired the Johnson A419 temp. controller and the probe doesn't look too watertight. Any problems if I silicone the wired end where the crimp is? Plan on placing this in a glass or a gel pack and don't wanna ruin it.
That should work or you could put a piece of silicone tubing over it. Watertight heat shrink tape is another option.
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Old 04-23-2011, 04:06 PM   #5
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http://cgproducts.johnsoncontrols.com/MET_PDF/125186.PDF

Johnson claims the probe is "splashproof". I've been running mine (for quite a while) with it submersed in a small bottle of water and no issues. I think many others here are doing the same. YMMV.

BTW, stay away from silicon with this probe. See last item of "Mounting Considerations" in link above.
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Old 04-23-2011, 06:07 PM   #6
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Thanks for the heads up regarding the silicone. Thinking of using an old vial now and drilling a hole through the cap and sliding an o-ring towards the wire end of the sensor so it doesn't end up taking a bath. Thanks everyone for your input.

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