Hanna Instruments HI 9828 - Manual (Page 32)

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4.2.3 Error list
If the meter does not accept a pH calibration point, a short message is displayed
to indicate the possible error source. See for example the following screens:
These are the available messages:
• “Input out of scale”: the pH value is out of scale.
• “Wrong buffer”: this message means that the difference between the pH read-
ing and the selected buffer is too big. Check if the proper calibration buffer has
been selected.
• “Invalid temperature”: this message means that the buffer temperature is out-
side the allowed range.
• “Wrong & Contaminated buffer / Check electrode”: this message means that
the buffer is contaminated or the electrode is broken or very dirty.
• “Wrong & Check electrode / Clean electrode”: this message means that the
electrode is broken or very dirty.
• “Wrong & Clear old calibration”: this message indicates an erroneous slope
condition. This message appears if the slope between current and previous
calibration points exceeds the slope window (80% to 110%). Press the CLEAR
sofkey to clear the old data and continue the calibration procedure, or press
ESC to quit the pH calibration mode.