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pH Calibration Error Messages
The HI9819X 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.
• “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 the Clear softkey to cancel the old data and continue the calibration
procedure, or press ESC to quit the pH calibration mode.
pH CALIBRATION
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