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Measurement of Conductivity

KCA_2
KCA_2 Member Posts: 308
in THE MAIN WALL
I have a conductivity tester (TDS also) and it reads in Uhmos. What is considered a reading where action is required?
TDS is in ppm and everywhere I've looked I'm given mg/liter

Anyway.. Hope someone knows or can point me to a site..

Thanks :-) Kca
:-) Ken

Comments

  • Aidan (UK)
    Aidan (UK) Member Posts: 290
    milligrammes & ppm

    1 ppm = 1 mg/litre. A litre weighs 1 kilogramme = 1,000 grammes = 1,000,000 milligrammes.

  • KCA_2
    KCA_2 Member Posts: 308
    Well...

    Thanks for the reply mate!! At what measurement 250mg/l or 600mg/l, is action required?

    At what measurement of conductivity is there a problem?

    :-) Kca
    :-) Ken
  • Aidan (UK)
    Aidan (UK) Member Posts: 290
    conductivity

    My previous answer was a little incorrect. A litre of water weighs 1 kg, so ppm = mg/l for aqueous solutions.

    As for the conductivity, I don't know. Every heating system I've ever dealt with has been filled with mains water with about 250 ppm hardness. It could be a problem if you were filling a system with well water with high TDS, but it's not a problem I've encountered. I've only ever used a conductivity meter on a de-ionized water system.

    It is not usual to check TDS on closed circuit heating systems, the pH and the oxygen content are the usual parameters that need to be measured and controlled.
    The system should be a closed circuit, with no evaporation. The TDS should not increase after the initial fill. I hope someone with more chemical knowledge will help you out.
  • hot_rod
    hot_rod Member Posts: 23,416
    Let me try

    is this a water only system? TDS will go up with treatments added. Clean water stay below 1200 TDS. TDS divided by .65 will give you conductivity number. Check the TDS on your fill water, and compare it to the boiler reading.

    Is the TDS creeping up? Sometimes this will indicate a leak and new freshwater being introduced.

    If the system has any type of chemical added the TDS number will be higher.

    Scott@rhomarwater.com is my go to guy, contact him for a better, possibly more accurate, explanation :)

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • KCA_2
    KCA_2 Member Posts: 308
    Thanks


    I am looking for solutions to high conductivity & TDS. Purging may be the only one for TDS.

    I e-mailed Scott. Thanks for both of your help.

    :-) Kca
    :-) Ken
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