Hanna-instruments HI 9828 Manual de usuario descargar pdf (Pagina 32)

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.

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Hanna-instruments HI 9828 Manual de usuario Pagina 32