Error Messages While Calibrating The Ph Meter - ProMinent DULCOMETER DMT Series Operating Instructions Manual

9.2
The following error messages can appear in the corresponding menu options
during calibration:
Error message
Zero point <-60mV !!!
Calibration failed
Zero point > 60mV !!!
Calibration failed
Slope < 40mV/pH !
Calibration failed
Slope > 65mV/pH !
Calibration failed
Warning
Measured value
unstable !!!
Buffer differential < 2 pH !
False buffer value
* The admissible setting time is: t
ProMinent ®

Error messages while calibrating the pH meter

Cause
N < -60 mV
N > +60 mV
S < 40 mV/pH
(S < 67 %)
S > 65 mV/pH
(S > 111 %)
Cause
t
cal
∆
IMPORTANT
The sensor monitoring is deactivated during the calibration
process!
Effect
Previous zero point and slope retained
Replace probe
Effect
> 30 s *
< pH 2 Use second buffer solution
Buffer
- Set correct buffer value
< 30 s for a value fluctuation ∆U < 2 mV/
cal
Troubleshooting
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