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Thread: Recalibrating pH sensor

  1. Back To Top    #1

    Join Date
    Apr 2012
    Newton, NC

    Recalibrating pH sensor

    Since opening the pool, my pH sensor has been consistently reporting a pH of 7.5. It occasionally goes up to 7.6, but the acid dispenser gets it back down to 7.5 quickly.

    Over the past several days, when testing the water I have been getting a pH of 7.2. I have 2 test kits (K-2005 and TF-100) and they both read 7.2. My test kits are close to 2 years old. Would the reagents in the kits have degraded and give inaccurate readings?

    Last year, the pH sensor and my testing were always very close. Of course, the pH sensor was stored in the house over the winter (tip in water). So, maybe that has caused it to need to be recalibrated?

    I have recalibrated the pH sensor to reflect my actual pH readings. If the experts think my test results may be inaccurate please let me know so I can re-recalibrate the pH sensor.
    Vince L

    16' x 37' fiberglass pool, 8' fiberglass spa, Hayward Swimclear C3030 filter, Hayward EcoStar VS pump, Goldline Pro Logic PL-PS-8, Goldline SWCG, Goldline Sense & Dispense pH control, Fiberstars LED's in pool & spa, AquaCal SQ175R heat pump, SR Smith Typhoon slide, Polaris 9300xi robotic cleaner, TF-100 Test Kit

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Recalibrating pH sensor

    Both the PH sensor and the test kits have about a two year lifetime. If the probe is 2 years old or older it is time to replace the probe. Otherwise, I would order a fresh bottle of the PH test reagent, and not worry about it until that shows up.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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