AQTemp Water Change - The Planted Tank Forum
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post #1 of 12 (permalink) Old 03-17-2017, 03:52 PM Thread Starter
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AQTemp Water Change

this invention came after i got fed up with adjusting the temperature during water changes using python system. Essentially, the water flows through the monitor, and you see the water temperature damped into the tank, with precision to a degree. You will be surprised how big the swings can be.

It is one of the simplest DIY projects. i find it very useful. I call it AQTemp Water Change Monitoring

Parts - all PVC parts are schedule 40, size 1/2":
1) T-joint, threaded at all three connections.
2) a plug, threaded.
3) 2 plastic hose barbs. diameter to fit the hose of your python system.
4) digital thermometer with probe. i used something similar to (that site) #272551439785

Materials:
teflon tape, epoxy, zip-tie.

The picture of the AQTemp is self explanatory, i believe.
1) start with the plug and the probe. Drill a hole in the plug, so the probe goes inside of the plug (see picture). If you are comfortable with soldering some wires, you can open the thermometer, unsolder the wires, run them through the hole, cut the wire to the size, and solder them back. In this case, the hole is 1/16 or so, just to run the wire though it. Alternatively, you can drill a larger hole, so probe can pass through it.
2) use some epoxy to fix the hole in the plug. Additionally, you may put some electric tape around the wire, so less of the hole needs to be covered. Leave it to cure for a day or so.
3) apply teflon tape to the plug, and to barbs, screw them into the T-joint.
4) zip-tie the thermometer to the T.

Enjoy!
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Last edited by alphabeta; 12-14-2019 at 09:26 PM.
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post #2 of 12 (permalink) Old 03-18-2017, 01:53 PM
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This is quite ingenious. It definitely beats the 'hand/finger' method of estimating water temperature!
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post #3 of 12 (permalink) Old 03-18-2017, 02:56 PM
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Nice mod! I was always frustrated having to start with "feels right on the hand" and then run to the tank to see what the thermometer there was saying. Lots of overshoot and undershoot before getting the temp right.

This seems like a pretty elegant solution.
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post #4 of 12 (permalink) Old 03-18-2017, 03:58 PM Thread Starter
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Darkblade48 and Hephaestus, thanks for your kind words! My modest contribution to the hobby and to this forum from which i learned a lot on DIY for planted tanks.
this solution is also cheap to make, and does not require extra tools.

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post #5 of 12 (permalink) Old 03-19-2017, 12:59 AM
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That is a neat idea . I have 2 of the Coralife digital thermometers , but the lag time on reading is about 30 seconds so I don't think they would be of any help in this application . Would end up with the same back and forth to get the temp right . May have to try one of the ones you linked . Anyway , thanks for posting the DIY .

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post #6 of 12 (permalink) Old 03-19-2017, 01:22 PM
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Here's another thought....once you get the right temperature (after hot and cold have run awhile), simply take a sharpie and draw a (approx 1/2") line on the backside of both faucets from handle to stem to serve as an index for the proper tank temperature. Takes the guess work out. Of course if you use a lot of water, you would need further adjustments depending on the size of your hot water heater.

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post #7 of 12 (permalink) Old 03-19-2017, 02:16 PM
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Quote:
Originally Posted by AbbeysDad View Post
Here's another thought....once you get the right temperature (after hot and cold have run awhile), simply take a sharpie and draw a (approx 1/2") line on the backside of both faucets from handle to stem to serve as an index for the proper tank temperature. Takes the guess work out. Of course if you use a lot of water, you would need further adjustments depending on the size of your hot water heater.
Good idea, but where I live the temperature of the cold water coming out of the tap varies quite bit from season to season.

Bump: This device is ingenious! I may have to do this myself.
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post #8 of 12 (permalink) Old 03-19-2017, 03:22 PM Thread Starter
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AbbeysDad, this is a good idea and will give you rough estimate. However: 1) depends on the season. 2) depends on how sensitive is the faucet and how hot is your water 3) most importantly, depends on the back pressure on the water from the hose.
with all these, in my particular setup i found it impossible to use the same position. Once i start using this device, i was more than surprised how much differential in temp some factors can have. we taking not 1-2 degrees, but big swings. But hey, if that works for you that's great.

Quote:
Originally Posted by Leeatl View Post
That is a neat idea . I have 2 of the Coralife digital thermometers , but the lag time on reading is about 30 seconds so I don't think they would be of any help in this application . Would end up with the same back and forth to get the temp right . May have to try one of the ones you linked . Anyway , thanks for posting the DIY .
I would not be too much concerned about 30 sec, but given the price of the thermometer i posted, makes sense to buy one.

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Last edited by Darkblade48; 03-20-2017 at 02:53 AM. Reason: Please use the edit function for back to back posts
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post #9 of 12 (permalink) Old 03-24-2017, 10:30 PM
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Very cool. I'd like to do something like this inline with my filter so I can add a safety control to my heater.

Where did you get the plastic barbs. Looking online, I'm mostly just seeing brass fittings, 90 degree elbows, or barbs with only one ridge. I would prefer something with multiple ridges like yours have.
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post #10 of 12 (permalink) Old 03-26-2017, 11:50 PM
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Quote:
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Very cool. I'd like to do something like this inline with my filter so I can add a safety control to my heater.



Where did you get the plastic barbs. Looking online, I'm mostly just seeing brass fittings, 90 degree elbows, or barbs with only one ridge. I would prefer something with multiple ridges like yours have.


Your local hardware store should have. I get plenty of them at Home Depot.


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post #11 of 12 (permalink) Old 03-27-2017, 06:00 PM
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Your local hardware store should have. I get plenty of them at Home Depot.


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Cool. Home Depot's website doesn't show them that I can find, but I'll check the hardware stores next time I'm there. Thanks.
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post #12 of 12 (permalink) Old 03-27-2017, 09:19 PM Thread Starter
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Cool. Home Depot's website doesn't show them that I can find, but I'll check the hardware stores next time I'm there. Thanks.
they are at HD (white, and expensive) and Menards (grey, cheap). I bought these online at usplastic. Nylon Tube & Hose Fittings | U.S. Plastic Corp.
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