ProMinent DULCOMETER DMT Series - Error Messages During pH Calibration

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Page 45
Troubleshooting
9.2 Error messages while calibrating the pH meter
The following error messages can appear in the corresponding menu options
during calibration:
Error message Cause Effect
Zero point <-60mV !!! N < -60 mV Previous zero point and slope retained
Calibration failed Replace probe
Zero point > 60mV !!! N > +60 mV ”
Calibration failed
Slope < 40mV/pH ! S < 40 mV/pH ”
Calibration failed (S < 67 %)
Slope > 65mV/pH ! S > 65 mV/pH ”
Calibration failed (S > 111 %)
Warning Cause Effect
Measured value t
cal
> 30 s *
unstable !!!
Buffer differential < 2 pH ! ∆
Buffer
< pH 2 Use second buffer solution
False buffer value - Set correct buffer value
* The admissible setting time is: t
cal
< 30 s for a value fluctuation ∆U < 2 mV/s
IMPORTANT
The sensor monitoring is deactivated during the calibration
process!
BA_DM_163_03_08_GB.p65 27.03.2008, 13:11 Uhr45