Hanna-instruments HI 9829 Manual de usuario descargar pdf (Pagina 40)

7.2.3 pH Calibration Error Messages

The HI 9829 displays a series of messages if an error has occurred during

calibration.

If the meter does not accept a pH calibration point, a short message is displayed

to indicate the possible error source. The following screens are examples:

These are the available messages:

• “Input out of scale”: the pH value is out of range. The pH sensor may

require replacement.

• “Check sensor”: the electrode may be broken, very dirty or the user has

attempted to calibrate the same buffer value twice. This may also occur if a

new pH sensor has been installed and”restore factory calib” has not been

exercised.

• “Wrong buffer”: the displayed pH reading is too far from the selected buffer

value. This is often seen immediately after a buffer calibration has been

completed but before the pH sensor has been moved to the next buffer. Check

if the correct calibration buffer has been selected.

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

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

contaminated or the sensor is broken or very dirty.

• “Check sensor” / “Clean sensor”: 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 <Restore Factory calib.> to

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

the pH calibration mode.

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Hanna-instruments HI 9829 Manual de usuario Pagina 40