IM 12B03D02-01E
7-2
7
.
Troubleshooting
7.2 Error Messages, Possible Causes, and Corrective
Actions
Table 7.1 Error Message
Error Message*1
Description
Occurrence
Err1
Unstable input emf
During calibration
Err2
Abnormal asymmetry potential
Err3
Abnormal slope or calibration temperature
Err4
Out of measuring range
During measurement
Err5
Out of temperature measuring range
Err6
Meter electronics failure
*1: For displayed digital characters, see Alphanumeric Display Table in Preface.
(1) Err1 Unstable input emf
Appears during calibration.
A calibration result is accepted when the variation of input emf for 10 seconds falls
within ±1 mV (approximately ±0.02 pH equivalent). If the variation for 10 seconds
cannot stabilize and is outside the range of ±1 mV even after 3 minutes has elapsed
in calibration, an Err1 message will appear.
Possible Causes:
• Dry electrode
• Clogged liquid junction
• Insulation failure in electronics
• Sensor immersed improperly
Corrective Actions:
• Leave the sensor in a standard solution until the reading stabilizes, and then try
recalibration
• Remove dirt or deposits from the liquid junction (see Section 6.2)
• Remove stain or moisture from the connectors (see Section 6.7)
• Immerse the sensor properly (see Section 3.2)
• Immerse the sensor in water for 1 to 2 hours or longer to rehydrate (see Section
6.4)
(2) Err2 Abnormal asymmetry potential
Appears during calibration.
A sensor deteriorates in service and the emf deviates from the initial one. If the
difference increases and exceeds the limit that can be compensated by calibration, an
Err2 message will appear. It will also appear if the pH value of the standard solution is
abnormal or if the asymmetry potential is outside the range of -96 to 120 mV.
