Yokogawa PH72 Personal pH/ORP Meter - Manual (Page 58)

IM 12B03D02-01E
7-1
7. Troubleshooting
7. Troubleshooting
7.1 Causes of Abnormal Readings and Errors
If the pH reading is unstable or abnormal, or an error message appears, during
measurement or calibration, check the following:
(1) Improper maintenance or usage
(2) Expired consumables
(3) Failure
If any trouble occurs, determine the cause and take corrective actions referring to Section
7.2. If the trouble cannot be fixed, contact your nearest Yokogawa sales office.
Symptom
Expired consumables
᭹
Unstable reading
᭹
Abnormal reading
᭹ Error message
᭹
Electrode
᭹
Batteries
Improper maintenance
᭹ Improper calibration
᭹
Stained electrode
᭹ Dry glass electrode
᭹
Deteriorated insulation of connectors
Meter failure
Contact Yokogawa
F0701.EPS
Figure 7.1 Causes of Abnormal Symptoms