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Testing a thermocouple

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  • Testing a thermocouple

    I decided to delete all my posts.
    Last edited by TheMaster; 09-25-2011, 07:51 PM.

  • #2
    Re: Testing a thermocouple

    Good job!
    Anyone can tear a man down, few can build one up.

    Comment


    • #3
      Re: Testing a thermocouple

      OK, I will bite
      27MV was the reading, Is that an acceptable reading, what is the normal range? What is the minimum MV reading a water Heater gas valve is looking for?

      Comment


      • #4
        Re: Testing a thermocouple

        I believe its 25- 30 is acceptable...
        Poor Planning On Your Part Does Not Constitute An Emergency On My Part!!
        You can fire me...but you can't tell me what to do!

        Derek

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        • #5
          Re: Testing a thermocouple

          Glad to see I'm not the only one that tests them. It is such an easy test to find out if the thermocouple is weak.

          Comment


          • #6
            Re: Testing a thermocouple

            Originally posted by TheMaster View Post
            Replaced this water ehater with a new one Saturday evening. I used my torch to heat the thermocouple with my test meter set to the millivolt setting. Atttached the alligator clips,one to the copper and one to the point of connection as the picture shows. The thermocouples maximum output was 27mv.

            Thanks. That's good info. I have a little device I screw onto the thermocouple. If the thermocouple doesn't hold the plunger down while being heated it's bad. I like your way better.
            Time flies like an arrow.

            Fruit flies like a banana.

            Comment


            • #7
              Re: Testing a thermocouple

              I'm sorry I missed this. Nice work.

              Comment


              • #8
                Re: Testing a thermocouple

                Great read for all Master Thanks Tool
                PS Is there an ez way to find the M. Volts For individual W. Htrs. and Direct Vent Heaters ?
                Last edited by toolaholic; 04-25-2011, 07:18 PM.
                I can build anything You want , if you draw a picture of it , on the back of a big enough check .

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                • #9
                  Re: Testing a thermocouple

                  i like the video . they r so cheap i think the best test is a new one

                  Comment


                  • #10
                    Re: Testing a thermocouple

                    Yep, me too.
                    sigpic

                    Comment


                    • #11
                      Re: Testing a thermocouple

                      Me too

                      Comment


                      • #12
                        Re: Testing a thermocouple

                        I have a pretty expensive TC tester but I don't think I've used it in 10 years except for teaching.
                        sigpic

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                        • #13
                          Re: Testing a thermocouple

                          I was thinking the same thing, never needed to test one and never will. With the new controls now it's pointless. If someone really wants to keep their old W/H then I'll replace the thermocouple to see if it works just like I have for years.

                          Comment


                          • #14
                            Re: Testing a thermocouple

                            I carried the coil from a MR2 safety for about 20-years and then lost it. Now I have to use my millivolt meter.

                            Mark
                            "Somewhere a Village is Missing Twelve Idiots!" - Casey Anthony

                            I never lost a cent on the jobs I didn't get!

                            Comment


                            • #15
                              Re: Testing a thermocouple

                              Originally posted by TheMaster
                              Yes I was thinking its better to guess and just change the part and see what happens!!!!!!!
                              Me too! Pilot not staying lit, change thermo couple, stays lit, I'm done.

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