Endress+Hauser CM14 - Page 35

CM14 Troubleshooting
Endress+Hauser 35
Diagnostic
code
Message text Description
S844 Process value
Measured value outside the specified range.
Possible reasons:
• Sensor in air
• Air cushion in the assembly
• Incorrect sensor inflow
• Sensor defective
Remedy:
• Increase process value
• Check measuring chain
• Change sensor type
S910 Limit switch Limit switch energized
Diagnostic
code
Message text Description
M500 Not stable
Sensor calibration canceled.
Main measured value unsteady.
Possible reasons:
• Sensor overaged
• Sensor temporarily dry
• Buffer value not constant
Remedy:
• Check sensor, replace if required
• Check buffer
M526
Cell const.
Sensor calibration warning.
Invalid cell constant, max. range reached.
Remedy:
• Recalibrate
• Enter cell constant according to factory specifications
• Replace sensor
M528 Cell const.
Sensor calibration warning.
Min. possible cell constant undershot.
Remedy:
• Recalibrate
• Enter cell constant according to factory specifications
M914 USP alarm
USP alarm.
Conductivity limit value for USP exceeded.
Remedy:
Check process
M915 USP warning
USP warning.
Conductivity limit value for USP undershot.
Remedy:
Check process