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    Parent DirectoryAqualink Sensor Repair, Save $45 or more

    Spendy Little Sensor Repair

    For some reason the water temperature sensor on my Aqualink RS system seems to go out once every 9 months. So the last time I didn't want to shell out the $45 or more to get a new one, I had to find a better solution. This page explains my simple, cheap, solution that anyone can do with a simple part from Radio Shack, a soldering iron, solder, small wire cutters, a drill and bit, and finally some kind of sealing compound.

    I did a little research and found that most temperature sensors were based on thermistors and that the most common value was 10K Ohm. A little more research led me to believe that the Aqualink sensor was based on one of these common 10K Ohm thermistors. Armed with this knowledge I set out to repair my Aqualink sendor and save a bunch of money.

    How I did it

    First I removed the sensor from the pool Equiptment, Here it is before the repair
    Next I drilled out the sensor and remove the wire. I wanted to clean out as much of the insides of the sensor without damaging the shell of the sensor. It has to be left water tight. Here is what the sensor looks like after it has been drilled out.
    The new thermistor sensor was prepaired by soldering it to the wire that I removed when I drilled out the sensor. The thermistor came from Radio Shack part number 271-110. I think it was under $2.
    Next I inserted the prepaired termistor inside the drilled out sensor shell. The deeper you can get the sensor, the better it will react to temprature changes. Be very careful on this step to not short out the wires. If you short out the wires your probe will not work.
    Once you have the new thermistor in place, seal the thermistor in place with some 'goop'. in my case I used some calulk. Once again make sure the wired don't short out and try to fill the whole drilled out area. Let the 'goop' dry and the sensor should be ready to use.
    Finally, re-install your sensor, run the pump for hour or so, check for leaks, and then calibrate the new sensor on your control panel using a traditional thermometer. You should be good to go now.

    Final Thoughts

    It might be possible that the particular thermistor you get from Radio Shack is out of range that you can calibrate to, but I don't know for sure. Depending on how you prepair the sensor shell, reaction to temprature change may be slower than the original sensor.

    If you build this and it works or does not work for you let me know and we can compair notes.

    Contact me at mike -at- mycal . net


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    Last Update at 08-16-2017 11:23 am
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