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6 Calibration of the pH combination electrode
6.7
Error messages of the pH calibration
Display
Cause
The neutral buffer is not admissible:
• Combination electrode is defective Clean combination electrode, recalibrate.
• Wrong buffer solution
• Buffer solution used up
The slope is too low:
• Combination electrode is defective
• Buffer solution used up
The slope is too high:
• Combination electrode is defective
• Buffer solution used up
Wrong calibration temperature
NOTE!
After prior 2 point calibration, the slope for the entire measuring range is
displayed (SL.).
After prior 3 point calibration, the slope for the acidic range is displayed
first (SL. 1). After pressing the
(SL. 2) is displayed.
key again, the slope for the alkaline range
Remedy
If error reoccurs:
replace combination electrode
Always use neutral buffer as first solution (excep-
tion: 1 point calibration)
Use new buffer solution
Replace combination electrode
Use new buffer solution
Replace combination electrode
Use new buffer solution
Only carry out calibration between 0 and 60 °C
31
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