ABB Endura APA592 Operating Instruction page 79

Endura APA592
pH / Redox (ORP) transmitter
Diagnostic Message
[Sub-error Message]
S066.044
Low sensor
efficiency (slope)
S068.043
High sensor
efficiency (slope)
Table 8.2 Diagnostic Messages (Continued)
OI/APA592–EN Rev. E
Possible Cause(s)
[Related Condition]
Problem with the sensor, improper
calibration, incorrect configuration
of user defined low sensor
efficiency limit.
[SENSOR]
Problem with the sensor, improper
calibration, incorrect configuration
of user defined high sensor
efficiency limit.
[SENSOR]
8 Troubleshooting and Diagnostics
Corrective Action
Verify the proper buffer values were used for
calibration.
Repeat calibration with correct buffer values.
Clean sensor and repeat a buffer and/or process
calibration.
If sensor is functioning properly, order a spare
sensor to replace the existing sensor when failure
occurs.
Replace existing sensor if sensor is not functioning
properly.
Verify terminal blocks and other connections are
free of any liquids, oils, scale or corrosion.
Verify sensor wiring is free of nicks, cuts, breaks,
shorts and / or open connections.
If wiring is damaged, replace wiring and / or sensor
and recalibrate.
Verify the proper buffer values were used for
calibration.
Repeat calibration with correct buffer values.
Clean sensor and repeat a buffer and/or process
calibration.
If sensor is functioning properly, order a spare
sensor to replace the existing sensor when failure
occurs.
Replace existing sensor if sensor is not functioning
properly.
Verify terminal blocks and other connections are
free of any liquids, oils, scale or corrosion.
Verify sensor wiring is free of nicks, cuts, breaks,
shorts and / or open connections.
If wiring is damaged, replace wiring and / or sensor
and recalibrate.
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