Hanna-instruments HI 98280 Manual de usuario descargar pdf (Pagina 33)

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”: the pH reading is too far from the selected buffer value. Check

if the correct calibration buffer has been selected.

• “Invalid temperature”: the buffer temperature is outside the allowed range.

• “Wrong buffer” / “Contaminated buffer” / “Check electrode”: the buffer is

contaminated or the electrode is broken or very dirty.

• “Wrong electrode” / “Check electrode” / “Clean electrode”: the electrode is

broken or very dirty.

• “Wrong” / “Clear old calibration”: erroneous slope condition. These messages

appear if the slope difference between the current and previous calibration

exceeds the slope window (80% to 110%). Press the <Clear> softkey to can-

cel the old data and continue the calibration procedure, or press ESC to quit

the pH calibration mode.

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Hanna-instruments HI 98280 Manual de usuario Pagina 33