LABEC M-PL-600 - Manual (Page 15)

The instrument has self diagnostics function, during operation,
relative information will be reminded by the instrument, to solve problems
during usage:
Err1: Electrode potential ≥2000mV。Please check if the instrument has
been connected with the sensor, the electrode has been hanged in
air, or the electrode has damaged.
Err2: Electrode potential≤-2000mV。Please check if the instrument has
been connected with the sensor, the electrode has been hanged in
air, or the electrode has damaged.
Err3: pH value＞15.00pH。Please check if the instrument has been
connected with the sensor, the electrode has been hanged in air, or
the electrode has damaged.
Err4: pH value＜-1.00pH。Please check if the instrument has been
connected with the sensor, the electrode has been hanged in air, or
the electrode has damaged.
Err5: Memory is full, could not store measurement information. Please
record and store measured information and clear all information in
the memory
Err6: Electrode potential during calibration over ranged selected pH buffer
set. Please check if the instrument has been connected with the
electrode, the electrode has damaged, if pH buffer selection is
correct, then recalibrate the electrode.
Err7: pH electrode zero point potential over range. Zero point potential
Offset＜-60mV，Offset＞60mV. The instrument will not allow you to
operate. Please check if there is air bubbles in electrode head, if the
buffer selection is correct, the pH buffer is in good quality, then
recalibrate the electrode. If the error still occurs, please change the
electrode.
Err8: pH slope over range Slope＜85％，Slope＞105％。The instrument will
not allow you to operate. Please check if there is air bubbles in
electrode head, if the buffer selection is correct, the pH buffer is in
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