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Thread: Ph probe calabration

  1. #1
    Join Date
    30.09.2015
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    19

    Default Ph probe calabration

    Hi have tried to calibrate my ph probe and I am having a few issues, first time I calibrated every thing went well and has for some time. The last couple of days I've tried to calibrate and this is what I get every time,
    First solution 7 I place the pin point probe and select enter it counts down and rises above 7 ph? It's reading 7.12 and the ADC reads 480' this is the Same with 9 ph solution the reading is 9.12 with a ADC 0268.
    Can you tell me what this ADC means and how to correct this calibration issue, I also have this with my redox probe

    Thanks redders

  2. #2
    Join Date
    27.05.2015
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    2,488

    Default

    How old is the pH probe?

  3. #3
    Join Date
    30.09.2015
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    19

    Default

    Hi the probes are about one year

  4. #4
    Join Date
    27.05.2015
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    If the calibration steps were followed correctly, it could be an issue with the probe nearing the end of its useful life.

  5. #5
    Join Date
    30.09.2015
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    19

    Default

    Ok thank you, can you advise me if this probe is only one year old what's the best ph probe to buy that's totally compatible with the ghl profilux.

  6. #6
    Join Date
    21.09.2011
    Location
    Southampton
    Posts
    389

    Default

    What does the probe read after you save the calibration and leave it in the 9 fluid for 10-15 to settle??

  7. #7
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    27.05.2015
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    If you're in the USA, genuine GHL probes can be purchased on our US online store, www.ghlusa.com

  8. #8
    Join Date
    30.09.2015
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    19

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    I don't know as I've not tried that yet, what should happen ?

  9. #9
    Join Date
    27.05.2015
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    Leaving it in there for that amount of time will allow the probe to stabilize the readouts and tell you if the probe is still giving you false readings or not.

  10. #10
    Join Date
    30.09.2015
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    So am I right in thinking if I calibrate and then save the result do I just leave the probe in the ph 9 solution for 10/15 min and should It return to 9 if it's been saved a 9.12. If it stays at the reading of what it's been saved at does this mean a faulty probe?

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