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Abs controllers and type "k" thermocouplers

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  • Abs controllers and type "k" thermocouplers

    We have a new abs tank controller and we have been trying to use our old type k ,2 wire thermocouplers with it but having no luck keeping them accurate. there is a setting that can be changed to work with type k but we are having terrible luck getting these to dial in and stay accurate. We keep having to adjust the "PUF" setting to register the actual temp.

    Is there something i am missing or a setting that i need to change on these controllers to get them to be accurate?

  • #2
    parameters adj.

    Originally posted by BSBC View Post
    We have a new abs tank controller and we have been trying to use our old type k ,2 wire thermocouplers with it but having no luck keeping them accurate. there is a setting that can be changed to work with type k but we are having terrible luck getting these to dial in and stay accurate. We keep having to adjust the "PUF" setting to register the actual temp.

    Is there something i am missing or a setting that i need to change on these controllers to get them to be accurate?
    " For TC input, please use the relative compensation cable."
    http://blog.uvm.edu/cwcallah/files/2...ser-manual.pdf
    Where in the manual does it say to start messing around with that parameter if the control is not reading correctly?
    You cabling and terminations have to be AAA, as in very well done for this type of sensor.
    You might be a lot more stable with correctly terminated RTD sensors in this case.
    This control looks problematic in some ways.

    https://blog.beamex.com/thermocouple...n-compensation
    Last edited by Starcat; 12-01-2019, 02:47 PM.
    Warren Turner
    Industrial Engineering Technician
    HVACR-Electrical Systems Specialist
    Moab Brewery
    The Thought Police are Attempting to Suppress Free Speech and Sugar coat everything. This is both Cowardice and Treason given to their own kind.

    Comment


    • #3
      Cabeling is done with 16g sheilded cable. If you dont change that "puf"parrameter the reading is at best 25 deg off.

      After changing that parameter it works. For a short time. Then it goes haywire again.

      Just was hoping to save some cash and use the couplers that we currently have and not spend the money for the rtd couplers.

      Comment


      • #4
        Something is not right there....

        Originally posted by BSBC View Post
        Cabeling is done with 16g sheilded cable. If you dont change that "puf"parrameter the reading is at best 25 deg off.

        After changing that parameter it works. For a short time. Then it goes haywire again.

        Just was hoping to save some cash and use the couplers that we currently have and not spend the money for the rtd couplers.
        Something is not right with this scenario and it should not be as thus. That control requires " compensating " extension cable, which is not just ordinary shielded cable.
        Connections have to be first rate on this kind of gear, and when shield wire is utilized, it is only terminated at one end.
        I would suggest speaking to Tech support at the control OEM.
        Warren Turner
        Industrial Engineering Technician
        HVACR-Electrical Systems Specialist
        Moab Brewery
        The Thought Police are Attempting to Suppress Free Speech and Sugar coat everything. This is both Cowardice and Treason given to their own kind.

        Comment


        • #5
          From what I know, you need to use type K thermocouple wire the ENTIRE length of run. And there should be NO splices in the run. Even the terminal block connections inside an electrical box must be made specifically for type K thermocouples. You should not be using any standard cable as part of the circuit. And as Warren stated, better to use RTD rather than thermocouple. As far as saving money, you've already wasted more time thinking about this than a good RTD costs.
          Phillip Kelm--Palau Brewing Company Manager--

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          • #6
            All is well

            I read through the blog that starcat provided and found a few interesting articles on thermocoupler applications. I never knew there were so many and meant for different applications.

            So i have purchased the pt100 and wire from ABS for all of our tanks instead of trying to save money by using what i had on hand. Type K thermocouplers can be used for these if the wire run is very short. As in 10 ft or less. We have these on our other tanks and our individual tank control is mounted on the wall right next to the tanks.

            Wasted more money on cable than i care to admit but now i think we may have this thing licked.

            Thank you Starcat.

            Comment


            • #7
              Im a fan of pt 100's

              OH- and I like this supplier, good customer support and have EVERTHING you need in this area.

              https://www.omega.com
              Last edited by Ted Briggs; 12-12-2019, 09:51 AM.
              Brewmaster, Minocqua Brewing Company
              tbriggs@minocquabrewingcompany.com
              "Your results may vary"

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              • #8
                Omega is great, but they arenít cheap. Automation Direct for sure. They have everything you need and the stuff you want. Click image for larger version

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                My last K-type install. They are great, but donít have a real place in the brewery.

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