In a moderate application at 25°C and 1 bar a normal pH sensor does not need more than once a month recalibration. This is the same for when stored on the shelf. If it is within 4 weeks of the last calibration it does not require recalibration.
It is possible to set the parameter “Calibration due” to for example 1 month. Then when the calibration date is more than 1 months ago it will give an error.
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