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  • pocket sensor leaking on hot water tank

    hi wondered if anyone could help

    i have an old thermal solar panel system with a 120 litre hot water twin coil tank, the pocket sensor is braised directly into the tank between the two fitting on the bottom coil, unfortunatly it has now started leaking out of the pocket and running down the wire, i had to isolate the power supply and have now snipped the wire off and put a compression stop end fitting on the stop the leak

    just wondered how i could solve the problem of a new sensor, i had to leave the sensor inside the leaking pocket as it wouldnt pull out, is there a sensor i can strap on the out side of the tank as all of the pocket sensors now screw into tank, at the moment i have to turn the solar system on by switch when it starts banging and turn it off again when the sun goes it

    sorry for all the waffling but i wanted to try and add as much info as possible off the bat

    cheers in advance for any help

    tim

  • #2
    You will have to find out if the original sensor was a 10k or a 1k ohm sensor . Then strap the new sensor to the tank with some thermal conducting paste applied. Repositioning of the sensor up or down on the tank may be required.

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    • #3
      cheers how can i check, the system is raydan 501 temperature controler, its got to be at least 15 years old as we have lived here for 14 years and it was installed before we moved in, i cant get to the wire in the tank as it leaks quite badly otherwise i would put a voltmeter on it

      where could i pick up a sensor from


      cheers again

      tim

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      • #4
        Originally posted by LucMan View Post
        You will have to find out if the original sensor was a 10k or a 1k ohm sensor . Then strap the new sensor to the tank with some thermal conducting paste applied. Repositioning of the sensor up or down on the tank may be required.
        I'd also suggest you consider replacing any other sensors. Braising gives better thermal contact than paste. Paste is OK, but it's probably just as important that all sensors have the same or as close to the same contact mechanisms as possible so that the controller doesn't get fooled into thinking the temp. diff. between coll. and tank is more or less than it actually is.

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        • #5
          Braising chickens is good.
          Braising a sensor will not make it any tastier.
          Brazing a sensor is a good way to kill it.
          NABCEP certified Technical Sales Professional

          [URL="http://www.solarpaneltalk.com/showthread.php?5334-Solar-Off-Grid-Battery-Design"]http://www.solarpaneltalk.com/showth...Battery-Design[/URL]

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          • #6
            Originally posted by Naptown View Post
            Braising chickens is good.
            Braising a sensor will not make it any tastier.
            Brazing a sensor is a good way to kill it.
            Naptown: You are correct. I should have been more specific and not implied that braising sensors is appropriate. I was focused on having the same fixing method for all sensors. I could have done a lot better on that one.

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            • #7
              Originally posted by phate316 View Post
              cheers how can i check, the system is raydan 501 temperature controler, its got to be at least 15 years old as we have lived here for 14 years and it was installed before we moved in, i cant get to the wire in the tank as it leaks quite badly otherwise i would put a voltmeter on it

              where could i pick up a sensor from


              cheers again

              tim
              Sorry can't help you with that, I'm not familiar with that control. You may have to purchase one of each and wire it in and see which one registers the correct temp.

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              • #8
                cheers i dont mind having to purchase both sensors just where the cheapest place to buy them from as i guess that the local b and q or city plumbing wont stock em

                cheers again for all the help


                tim

                Comment


                • #9
                  Originally posted by phate316 View Post
                  cheers i dont mind having to purchase both sensors just where the cheapest place to buy them from as i guess that the local b and q or city plumbing wont stock em

                  cheers again for all the help


                  tim
                  I buy them from my local plumbing supply house, they have the Tekmar Controls 10k strap on or slab sensors in stock for around $25.
                  Try going to Radio Shack first and buy a 1k and a 10k resister, wire each one to your leads. The correct resistance will read 25C or 77F on your display if you have one .

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                  • #10
                    cheers chap unfortunatly im in the uk so radio shack is out of the question for me, on ebay the sensors are ranging from £25 to £40 for 1 and 10k ones prewired so im going to check out local electronics parts supplier to see if i can optain the correct slab resistors

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