CM42-MAA101EBE00 Diagnostics, troubleshooting
Endress+Hauser 15
4. Contact the Service Department if you cannot rectify the error yourself. Only cite the error
number.
3.1.2 Process errors without messages
Problem Possible cause Tests and/or remedial measures
Display values deviate
from reference
measurement
Incorrect calibration Repeat the calibration.
Where necessary, check and repeat the calibration
with the reference device.
Sensor fouled Clean the sensor.
Temperature measurement Check the temperature measured values of both
devices.
Temperature compensation Check the settings for temperature compensation
and adjustment for both devices.
Measuring chain
zero-point cannot be
adjusted
Contaminated reference system Test with new sensor
Junction clogged Clean or grind junction
Asymmetric sensor voltage too high Clean junction or test with another sensor
No change or subtle
change in display
– Sensor fouled
–Sensor old
– Sensor defective (reference lead)
Clean the sensor.
Reference has low level of KCl Check KCl feed (0.8 bar above medium pressure).
Measuring chain slope:
– Cannot be adjusted
– Too low
–No slope
Device input defective Check device directly.
–Sensor old
– Hair-line crack in glass
membrane
Replace sensor.
Constant, incorrect
measured value
Sensor not immersing or protection
cap not removed
Check installation position, remove protection cap.
Air pockets in assembly Check assembly and orientation.
Ground connection at or in device Carry out test measurement in isolated vessel, poss.
with buffer solution.
Hair-line crack in glass membrane Replace sensor.
Device has impermissible operating
status (no reaction to keys being
pressed)
Switch device off and then on again.
Incorrect temperature
value
Sensor defective Replace sensor
Measured value
fluctuations
Interference on signal output cable Check cable routing, route cable separately if
necessary.
Interference potential in medium Eliminate source of interference or ground medium
as close as possible to sensor.
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