Endress+Hauser Liquisys M CLM223 - Process-Specific and Device-Specific Errors

Diagnostics and troubleshooting Liquisys M CLM223/253
84 Endress+Hauser
Error
No.
Display Tests/remedial action Alarm
contact
Error
current
Autom.
cleaning
start
PROFIBU
S
Status
Facty Facty Facty PV
1)
User User User Temp
than the set
permissible maximum
period
X
E157 Actual value exceeds
alarm threshold for
longer than the set
permissible maximum
period
Yes No No X
X
E162 Dosage stop Check settings in the
CURRENT INPUT and
CHECK function groups.
Yes No No X
X
E171 Flow in main stream
too low or zero
Restore flow. Yes No No X
X
E172 Switch-off limit for
current input exceeded
Check process variables at
sending measuring device.
Change range assignment
if necessary.
Yes No No X
X
E173 Current input < 4 mA Yes No No X
X
E174 Current input > 20 mA Yes No No X
X
1) PV = process variable, primary value
8.3 Process-specific errors
Use the following table to localize and rectify any errors occurring.
Error Possible cause Tests/remedial action Tools, spare parts
Incorrect reading
compared to
comparison
measurement
Device calibrated
incorrectly
Calibrate the device according to
Kap. the "Calibration" section
Calibration solution or cell
certificate
Sensor fouled Clean sensor See the "Cleaning of
conductivity sensors"
section
Incorrect temperature
measurement
Check temperature measured
value in measuring device and
reference device
Temperature measuring
device, precision
thermometer
Temperature
compensation incorrect
Check compensation method
(none / ATC / MTC) and
compensation type (linear/
substance/user table)
Please note: the
transmitter has separate
calibration and operating
temperature coefficients
Reference device is
calibrated incorrectly
Calibrate reference device or use
verified device
Calibration solution,
Operating Instructions of
reference device
Incorrect ATC setting in
reference device
Compensation method and
compensation type must be
identical on both devices.
Operating Instructions of
reference device
Polarization errors Use suitable sensor:
• Use larger cell constant
• Use graphite instead of
stainless steel (check
resistance)
Measuring range tables
e.g. in SI "Conductivity" or
technical data of
conductivity sensors