pH and NH3 probe calibration

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    Version as of 06:03, 24 Apr 2024

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    Normal systems for continously measuring PH require calibration.

    Calibration should always be done using more than one point to ensure accuracy.

    Remember if you have a probe it will only be as good as the calibration fluids used to set it and these can greatly vary.

    Good quality calibration fluids should be used and these can be expensive. Also PH probes should be changed anually as there response and accuracy will change with age.

    Low cost pH probes can be very inaccurate in low buffered solution, this is due to the fact that a certain amount of ionic strength is required to create a reading in the electrode.

     

    NH3 can not be calibrated as all calibaration fluids would be uinstable when stored due to off gassing.