Endress+Hauser Liquiline CM442R User manual

Products Solutions Services
BA01227C/07/EN/01.13
71220446
Valid as of:
Softwareversion 01.04.00
Operating Instructions
Liquiline
CM442R/CM444R/CM448R
Universal four-wire multichannel controller for
control cabinet installation
Maintenance & diagnostics

About this manual
This manual describes all the tasks you must perform for maintenance, diagnostics and repair.
A description of the following is provided here:
• General troubleshooting
• Overview of the diagnostic messages
• Description of the information in the "Diagnostics" menu
– Diagnostics list
–Logbooks
– System information
– Sensor information
–Systemtest/Reset
• Maintenance
• Spare parts and accessories
This manual does not include the following:
For a description of the following menus, refer to the listed manuals.
• Display/Operation
--> Operating Instructions BA01225C "Commissioning"
• Basic setup
--> Operating Instructions BA01225C "Commissioning"
• Setup/General settings
--> Operating InstructionsBA00450C "Operation & settings"
•Inputs
--> Operating InstructionsBA00450C "Operation & settings"
•Outputs
--> Operating InstructionsBA00450C "Operation & settings"
• Additional functions
--> Operating InstructionsBA00450C "Operation & settings"
•Calibration
--> Operating Instructions BA00451C "Calibration"
•Expert
--> Internal Service Manual

Endress+Hauser
Liquiline CM442R/CM444R/CM448R
Table of contents
1 Diagnostics and
troubleshooting . . . . . . . . . . . . . 4
1.1 General troubleshooting . . . . . . . . . . . . . . 4
1.2 Diagnostic information on onsite display
(optional) . . . . . . . . . . . . . . . . . . . . . . . . . 13
1.3 Diagnostic information via web browser 13
1.4 Diagnostic information via fieldbus . . . 13
1.5 Adjusting diagnostic information . . . . . 13
1.6 Overview of diagnostic information . . . 16
1.7 Pending diagnostic messages . . . . . . . . . 32
1.8 Diagnostics list . . . . . . . . . . . . . . . . . . . . . 32
1.9 Event logbook . . . . . . . . . . . . . . . . . . . . . . 33
1.10 Simulation . . . . . . . . . . . . . . . . . . . . . . . . 36
1.11 Reset measuring instrument . . . . . . . . . 37
1.12 Device information . . . . . . . . . . . . . . . . . 38
1.13 Firmware history . . . . . . . . . . . . . . . . . . . 39
2 Maintenance. . . . . . . . . . . . . . . 40
2.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . 40
2.2 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 40
3 Repair. . . . . . . . . . . . . . . . . . . . . 42
3.1 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . 42
3.2 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.3 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4 Accessories . . . . . . . . . . . . . . . . 46
4.1 Measuring cable . . . . . . . . . . . . . . . . . . . . 46
4.2 Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.3 Additional functionality . . . . . . . . . . . . . 51
4.4 Software . . . . . . . . . . . . . . . . . . . . . . . . . . 53
4.5 Other accessories . . . . . . . . . . . . . . . . . . . 53
Index. . . . . . . . . . . . . . . . . . . . . . 54

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
4Endress+Hauser
1 Diagnostics and troubleshooting
The color of the display background changes to red if a diagnostics message for error category
"F" occurs.
1.1 General troubleshooting
1.1.1 Troubleshooting
A diagnostic message appears on the displayor via the fieldbus indicating that the measured
values are not plausible, or you identify a fault.
1. See the Diagnostics menu for the details on the diagnostic message.
Follow the instructions to rectify the problem.
2. If this does not help: Search for the diagnostic message under "Overview of diagnostic
information" (→ä16) in this manual. Use the message number as a search criterion. Ignore
the letters indicating the Namur error category.
Follow the troubleshooting instructions provided in the last column of the error tables.
3. If the measured values are implausible, the onsite display is faulty or you encounter other
problems, search for the faults under "Process errors without messages" (→ä4) or
"Device-specific errors" (→ä12).
Follow the recommended measures.
4. Contact the Service Department if you cannot rectify the error yourself. Only cite the error
number.
1.1.2 Process errors without messages
pH/ORP measurement
Problem Possible cause Tests and/or remedial measures
Display deviates 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

Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 5
No change or subtle
change in display
– Sensor fouled
–Sensorold
– Sensor defective (reference lead)
Clean the sensor.
Reference has low level of KCl Check KCl supply: 0.8 bar (12 psi) over medium
pressure
Measuring chain slope:
– Cannot be adjusted
–Tolow
–Noslope
Device input defective Check device directly.
–Sensorold
– Hair-line crack in the glass
membrane
Renew sensor.
Constant, incorrect
measured value
Sensor does not immerse properly
or protection cap not removed
Check installation position, remove protection cap.
Air pockets in assembly Check assembly and orientation.
Ground fault at or in device Perform test measurement in isolated vessel, with
buffer solution if applicable.
Hair-line crack in the glass
membrane
Renew sensor.
Device in impermissible operating
condition (does not respond when
key pressed)
Switch off device and switch it on again.
Incorrect temperature
value
Sensor defective Replace sensor
Fluctuations in measured
value
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.
No current output signal
Cable disconnected or
short-circuited
Disconnect cable and measure directly at device.
Output defective See "Device-specific errors" section.
Fixed current output
signal
Current simulation active Switch off simulation.
Incorrect current output
signal
Total load in current loop too high Measure the load and reduce it to the permitted
value if necessary (--> Technical data, Operating
Instructions "Commissioning").
EMC (interference coupling) Check wiring. Identify and eliminate cause of
interference.
Problem Possible cause Tests and/or remedial measures

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
6Endress+Hauser
Conductivity measurement
Problem Possible cause Tests and/or remedial measures
Display deviates 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.
Display deviates from
reference measurement
Polarization fields Use suitable sensor:
• Larger cell constant
• Graphite instead of stainless steel (observe
material resistance properties)
Implausible measured
values:
– Measured value
constantly 000
– Measured value too low
– Measured value too
high
– Measured value frozen
– Current output value
not as expected
Short-circuit/moisture in sensor Check sensor.
Short-circuit in cable or socket Check cable and socket.
Disconnection in sensor Check sensor.
Disconnection in cable or socket Check cable and socket.
Incorrect cell constant setting Check cell constant.
Incorrect output assignment Check assignment of measured value to current
signal.
Air pockets in assembly Check assembly and orientation.
Ground fault at or in device Measure in isolated vessel.
Device in impermissible operating
condition (does not respond when
key pressed)
Switch off device and switch it on again.
Incorrect temperature
value
Sensor defective Replace sensor

Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 7
Oxygen measurement
Measured value in process
incorrect
No/incorrect temperature
compensation
ATC: select type of compensation; if linear, set
suitable coefficients.
MTC: set process temperature.
Incorrect temperature measurement Check temperature measured value.
Bubbles in medium Suppress formation of bubbles by:
– Gas bubble trap
– Creating counterpressure (orifice plate)
– Measurement in bypass
Flow rate too high (can lead to
bubble formation)
Reduce flow rate or select less turbulent mounting
location.
Voltage potential in medium (only
for conductive)
Ground medium close to sensor.
Sensor fouling or buildup on sensor Clean sensor (see "Cleaning the conductivity sensors"
section).
Fluctuations in measured
value
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.
Interference on measuring cable Connect cable shield as per wiring diagram.
No current output signal
Cable disconnected or
short-circuited
Disconnect cable and measure directly at device.
Output defective See "Device-specific errors" section.
Fixed current output
signal
Current simulation active Switch off simulation.
Incorrect current output
signal
Total load in current loop too high Measure the load and reduce it to the permitted
value if necessary (--> Technical data, Operating
Instructions "Commissioning").
EMC (interference coupling) Check wiring. Identify and eliminate cause of
interference.
Problem Possible cause Tests and/or remedial measures
Display value - - - -
Sensor defective Test with new sensor
Sensor cable disconnected Check cable or cable extension.
Incorrect sensor connection Check the connection at the input module (--> BA
"Commissioning", "Wiring" section).
Electronics module defective Replace the module.
Problem Possible cause Tests and/or remedial measures

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
8Endress+Hauser
No change or subtle
change in display
– Sensor fouled
– Sensor old (membrane)
• Clean the sensor.
• If necessary:
– Change electrolyte, change membrane cap
(amperometric sensor)
– Change fluorescence cap (optical sensor)
Constant, incorrect
measured value
Device in impermissible operating
condition (does not respond when
key pressed)
Switch off device and switch it on again.
Measured value too low
Membrane fouled Clean or replace cap
Electrolyte exhausted or
contaminated
Change electrolyte
Anode coating worn Repolarize sensor
Black anode coating Regenerate sensor in factory
Measured value too high
Air pocket under membrane Clean sensor, optimize installation where necessary
Polarization not complete Wait until polarization time elapses (--> Technical
data in sensor operating manual)
Implausible measured
value
Incorrect temperature measurement Check/correct value.
Incorrect altitude setting Incorrect calibration
Reset and repeat calibration.
Incorrect air pressure
Incorrect temperature
value
Incorrect sensor connection Check the connection at the input module (--> BA
"Commissioning", "Wiring" section).
Temperature sensor defective Replace sensor
Fluctuations in measured
value
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.
No current output signal
Cable disconnected or
short-circuited
Disconnect cable and measure directly at device.
Output defective See "Device-specific errors" section.
Fixed current output
signal
Current simulation active Switch off simulation.
Incorrect current output
signal
Total load in current loop too high Measure the load and reduce it to the permitted
value if necessary.
EMC (interference coupling) Disconnect both output cables and measure directly
at device.
Problem Possible cause Tests and/or remedial measures

Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 9
Chlorine measurement
Problem Possible cause Tests and/or remedial measures
Display value - - - -
Sensor defective Test with new sensor
Sensor cable disconnected Check cable or cable extension.
Incorrect sensor connection Check the connection at the input module (--> BA
"Commissioning", "Wiring" section).
Electronics module defective Replace the module.
Slope too low Sensor was in chlorine-free water or
in air.
Short conditioning over (not in!) chlorine bleach,
wait for adjustment time in water to elapse before
calibration.
Values do not match the
DPD control measurement
Measurement is performed without
pH compensation while DPD
measurement is always buffered to
pH 6.3.
Measure the chlorine value with pH compensation
DPD measured value far
too high
Organic chlorination agents
(possibly also only used temporarily
or for shock chlorination). In this
instance, no correlation between
actual free available chlorine, DPD
measurement and amperometric
measurement. DPD value up to 5
times too high.
Use free (gaseous) chlorine or chlorine from
inorganic chlorine compounds.
Chlorine value too high
Membrane defective Replace membrane cap
Polarization not complete Wait for the polarization time to elapse
Alien oxidizing agents Analyze medium
Shunt in chlorine sensor Replace sensor
Chlorine value too low
Measuring chamber not closed Refill and screw closed carefully
Air bubble outside in front of
membrane
Remove air bubble, select a better installation
position if possible.
Air bubble inside membrane Refill and screw closed so that it is air-free
No change or subtle
change in display
Sensor fouled Clean sensor
Sensor old Replace sensor
Sensor defective (ref. lead) Replace sensor
Constant, incorrect
measured value
Sensor does not immerse properly
or protection cap not removed
Check installation position, remove protection cap
Air pockets in assembly Check assembly and orientation
No current output signal
Cable disconnected or
short-circuited
Disconnect cable and measure directly at device.
Output defective See "Device-specific errors" section.

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
10 Endress+Hauser
Measurement with ion-selective sensors
Fixed current output
signal
Current simulation active Switch off simulation.
Incorrect current output
signal
Total load in current loop too high Measure the load and reduce it to the permitted
value if necessary (--> Technical data, Operating
Instructions "Commissioning").
EMC (interference coupling) Check wiring. Identify and eliminate cause of
interference.
Problem Possible cause Tests and/or remedial measures
Temperature value always
20 ˚C or incorrect
– Temperature sensor not
connected or connected
incorrectly
– Temperature sensor defective
– Cable to temperature sensor
defective
– Check temperature sensor and replace where
necessary
– Replace the cable
Display values deviate
from reference
measurement
Incorrect calibration Repeat the calibration.
Where necessary, check and repeat the calibration
with the reference device.
Electrode connected to the wrong
slot
Compare terminal assignment to setting on
transmitter
Electrodes fouled Clean the electrodes.
Incorrect temperature measurement Check the temperature measured values of both
devices.
Temperature compensation Check the settings for temperature compensation
and adjustment for both devices.
pH compensation (only for
ammonium), pH measurement
Check the settings and the pH measurement if
necessary.
No change or subtle
change in display
–Electrodesfouled
– Electrodes too old
– Electrodes defective
– Clean the electrodes
– Replace membrane cap and electrolyte
– Replace the electrodes
Measured value drift
Reference of pH electrode defective Replace the pH electrode
Contamination of reference
electrode or ion-selective electrodes
Application problem
Constant, incorrect
measured value
Sensor does not immerse properly
or protection cap of the pH electrode
not removed
Check installation position, remove protection cap.
Air bubble in the electrode between
membrane and inner terminal leads
Tap the electrolyte in the electrode towards the
membrane
Membrane cap or electrode
defective
Replace the membrane cap or electrode.
Problem Possible cause Tests and/or remedial measures

Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 11
Turbidity, SAC and nitrate measurement
Measuring chain
zero-point not stable and
cannot be adjusted
Sensor does not immerse properly
or protection cap of the pH electrode
not removed
Check installation position, remove protection cap.
Air bubble in the electrode between
membrane and inner terminal leads
Tap the electrolyte in the electrode towards the
membrane
Membrane cap or electrode
defective
Replace the membrane cap or electrode.
Electrodes contaminated Test with new electrodes
Reference of pH electrode used Replace the pH electrode
Electrode connected to the wrong
slot
Compare terminal assignment to setting on
transmitter
Display fluctuates greatly Air bubbles in the electrodes Tap the electrolyte in the electrode towards the
membrane
Fluctuations in measured
value
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.
No current output signal
Cable disconnected or
short-circuited
Disconnect cable and measure directly at device.
Output defective See "Device-specific errors" section.
Fixed current output
signal
Current simulation active Switch off simulation.
Incorrect current output
signal
Total load in current loop too high Measure the load and reduce it to the permitted
value if necessary (--> Technical data, Part 1).
Problem Possible cause Tests and/or remedial measures
Display value - - - -
Sensor defective Test with new sensor
Sensor cable disconnected Check cable or cable extension.
Incorrect sensor connection Check the connection at the input module (--> BA
"Commissioning", "Wiring" section).
Electronics module defective Replace the module.
No change or subtle
change in display
Sensor fouled Clean the sensor.
Constant, incorrect
measured value
Device in impermissible operating
condition (does not respond when
key pressed)
Switch off device and switch it on again.
Problem Possible cause Tests and/or remedial measures

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
12 Endress+Hauser
1.1.3 Device-specific errors
Implausible measured
value
Sensor not calibrated or incorrectly
calibrated
Calibration with original sample might be necessary
for concentration or solids content.
Sensor fouled Clean sensor
Sensor installed in "dead zone" or air
pocket in assembly or flange
Check installation position, move sensor to area that
receives good flow. Pay attention when mounting in
horizontal pipes
Incorrect sensor orientation Align sensor:
•Normalmedia:
Direct flow to measuring window
• For high solids content:
Align measuring window at angle of 90˚to flow
Incorrect temperature
value
Incorrect sensor connection Check the connection at the input module (--> BA
"Commissioning", "Wiring" section).
Temperature sensor defective Replace sensor
Fluctuations in measured
value
Interference on signal output cable Check cable routing, route cable separately if
necessary.
Irregular flow / turbulence / air
bubbles / large solid particles
Select a better mounting location or reduce
turbulence, use a large measured value damping
factor if necessary
Set gas bubble threshold to 100 %
No current output signal
Cable disconnected or
short-circuited
Disconnect cable and measure directly at device.
Output defective See "Device-specific errors" section.
Fixed current output
signal
Current simulation active Switch off simulation.
Incorrect current output
signal
Total load in current loop too high Measure the load and reduce it to the permitted
value if necessary.
EMC (interference coupling) Disconnect both output cables and measure directly
at device.
Value switches to zero and
back to measured value
Air bubbles Do not mount sensor above aeration discs
Problem Possible cause Tests and/or remedial measures
Dark display
(only with optional
display)
No supply voltage Check if supply voltage applied.
Display connector incorrectly
connected
Check. Must be inserted into RJ45 socket on basic
module.
Basic module defective Replace basic module
Problem Possible cause Tests and/or remedial measures

Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 13
1.2 Diagnostic information on onsite display (optional)
Up-to-date diagnostic events are displayed along with their status category, diagnostic code and
short text. Clicking on the Navigator lets you retrieve more information and tips on remedial
measures.
1.3 Diagnostic information via web browser
The same information as for the onsite display is available via the web server.
1.4 Diagnostic information via fieldbus
Diagnostic events, status signals and more information are transmitted according to the
definitions and technical capability of the respective fieldbus systems
1.5 Adjusting diagnostic information
1.5.1 Classification of diagnostics messages
More detailed information on the current diagnostics messages displayed is provided in the
DIAG/Diagnostics list menu.
Values appear on display
but:
– Display does not
change and / or
– Device cannot be
operated
Module not wired correctly Check modules and wiring.
Impermissible operating system
condition
Switch off device and switch it on again.
Implausible measured
values
Inputs defective First perform tests and take measures as outlined in
"Process-specific errors" section
Measuring input test:
– Connect the Memocheck Sim CYP03D to the
input and use this to test its function.
Current output, incorrect
current value
Incorrect adjustment Check with integrated current simulation, connect
mA meter directly to current output.
Load too large
Shunt / short to ground in current
loop
No current output signal Basic module defective Check with integrated current simulation, connect
mA meter directly to current output.
Problem Possible cause Tests and/or remedial measures

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
14 Endress+Hauser
In accordance with Namur specification NE 107, the diagnostics messages are characterized by:
• Message number
• Error category (letter in front of the message number)
–F= (Failure) a malfunction has been detected
–M= (Maintenance required) Action should be taken as soon as possible
–C= (Function check) (No error)
Maintenance work is being performed on the device. Wait until the work has been
completed.
–S= (Out of specification) The measuring point is being operated outside its specification
Operation is still possible. However, you run the risk of increased wear, shorter operating
life or lower accuracy levels. The cause of the problem is to be found outside the measuring
point.
• Message text
If you contact the Service Department, please cite the message number only. Since you can
individually change the assignment of an error to an error category, the Service Department
cannot use this information.
1.5.2 Adjusting diagnostic behavior
All the diagnostics messages are assigned to specific error categories at the factory. Since other
settings might be preferred depending on the application, error categories and the effect errors
have on the measuring point can be configured individually. Furthermore, every diagnostics
message can be disabled.
Example
The controller returns diagnostics message 531 "Logbook full". You want to change this message
so that an error is not indicated on the display for example.
1. Go to:
– Menu/Setup/General settings/Extended setup/Diagnostics/Device behavior
for device-specific diagnostics messages (as in this example)
– Menu/Setup/Inputs/<sensor type>/Extended setup/Diagnostics settings/Diag.
behavior
for sensor-specific diagnostics messages.
2. Select the diagnostics message and press the navigator button.
3. Decide:
a. Should the message be deactivated?
b. Do you want to change the error category?
c. Should an error current be output?
d. Do you want to trigger a cleaning program?
4. Deactivate the message, for example (Diagnostics message to "Off").
Possible settings
The list of diagnostic messages displayed depends on the path selected. There are
device-specific messages, and messages that depend on what sensor is connected.

Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 15
Path: ... /Extended setup/Diagnostics settings/Diag. behavior
Function Options Info
List of diagnostic messages Select the message to be changed. Only then can you
make the settings for this message.
Diag. code Read only
Diagnostic message Options
•On
•Off
Factory setting
Depends on the message
You can deactivate or reactivate a diagnostics message
here.
Deactivating means:
• No error message in the measuring mode
• No error current at the current output
Error current Options
•On
•Off
Factory setting
Depends on the message
Decide whether an error current should be output at the
current output if the diagnostic message display is
activated.
Status signal Options
• Maintenance (M)
• Out of specification (S)
•Functioncheck(C)
• Failure (F)
Factory setting
Depends on the message
The messages are divided into different error categories
in accordance with NAMUR NE 107.
Decide whether you want to change a status signal
assignment for your application.
Diag. output Options
•None
Factory setting
None
Before you can assign the message to an output, you
must first configure a relay output to "Diagnostics"
(Menu/Setup/Outputs, assign the "Diagnostics" function
and set the Operating mode to "as assigned").
Cleaning program Options
•None
• Cleaning 1
• Cleaning 2
• Cleaning 3
• Cleaning 4
Factory setting
None
Decide whether the diagnostic message should trigger a
cleaning program.
You can define the cleaning programs under:
Menu/Setup/Additional functions/Cleaning.
Detail information Read only Here you can find more information on the diagnostic
message and instructions on how to resolve the
problem.

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
16 Endress+Hauser
1.6 Overview of diagnostic information
1.6.1 Device-specific, general diagnostics messages
No. Message Factory settings Tests or remedial measures
Cat. Diag.
on/off
Error
current
202 Selftest active F On Off Wait for self-test to be finished
216 Hold active C On Off Output values and status of the channel are on
hold
241 Device error F On On Internal device error
1. Update the software
2. Contact the Service Department
3. Replace the backplane (Service)
242 Software incomp. F On On
243 Device error F On On
261 Electr. module F On On Electronics module defective
1. Replace the module
2. Contact the Service Department
263 Electr. module F On On Wrong kind of electronics module
1. Replace the module
2. Contact the Service Department
284 Firmware update M On Off Update completed successfully
285 Update error F On On Firmware update failed
1. Repeat update
2. SD card error --> use another card
3. Incorrect firmware --> repeat with suitable
firmware
4. Contact the Service Department
302 Battery low M On Off Buffer battery of real time clock is low
The date and time are lost if the power is
interrupted.
--> Contact the Service Department (battery
replacement)
304 Module data F On On At least 1 module has incorrect configuration
data
1. Check the system information
2. Contact the Service Department
305 Power consum. F On On Total power consumption too high
1. Check installation
2. Remove sensors/modules
306 Software error F On On Internal firmware error
--> Contact the Service Department
370 Intern. Voltage F On On Internal voltage outside the valid range
--> Check supply voltage
373 Electr. temp. M On Off High electronics temperature
--> Check ambient temperature and energy
consumption

Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 17
374 Sensor check F On Off No measurement signal from sensor
-> Check the sensor connection
-> Check sensor, replace if necessary
401 Reset to default F On On Factory reset is performed
406 Param. active C Off Off --> Wait for configuration to be finished
407 Diag. active C Off Off --> Wait for maintenance to be finished
412 Writing backup F On Off --> Wait for the write process to be finished
413 Reading backup F On Off --> Wait
460 Curr. under-run S On Off Reasons
• Sensor in air
• Air pockets in assembly
• Sensor fouled
• Incorrect flow to sensor
Measures
1. Check sensor installation
2. Clean sensor
3. Adjust assignment of current outputs
461 Current exceeded S On Off
462 Output Deviation S On Off When the current output is read back, the value
deviates from the target value displayed.
Possible reasons: Current load outside
specification, short-circuit or open current loop,
module defective
1. Check installation of current loop
2. Check module
3. Contact the Service Department
502 No text catalog F On On --> Contact the Service Department
503 Language change M On Off Language change failed
--> Contact the Service Department
530 Logbook at 80% M On Off 1. Save the logbook to the SD card and then
delete the logbook in the device
2. Set memory to ring memory
3. Deactivate logbook
531 Logbook full M On Off
532 License error M On Off --> Contact the Service Department
540 Parameter save M On Off Configuration saving has failed, --> repeat
541 Parameter load M On Off Configuration successfully loaded
542 Parameter load M On Off Configuration loading has failed, --> repeat
543 Parameter load M On Off Configuration loading aborted
544 Parameter reset M On Off Factory default successful
910 Limit switch S On Off Limit switch activated
No. Message Factory settings Tests or remedial measures
Cat. Diag.
on/off
Error
current

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
18 Endress+Hauser
921 Pump bracket F On On The pump bracket is detected as open.
•Pumpbracketopen
• Reed contact defective
-> Close the pump bracket
-> Contact the Service Department
969 Modbus Watchdog S Off Off The device did not receive a Modbus telegram
from the master within the specified time. The
status of modbus process values received is set to
invalid.
970 Input Overload S On On Current input overloaded
The current input is switched off from 23 mA due
to overload and reactivated automatically when a
normal load is present.
971 Input low S On On Current input too low
At 4 to 20 mA, the input current is less than the
lower error current
--> Check the input for short-circuits.
972 Input > 20 mA S On On Current output range exceeded
973 Input < 4 mA S On On Current output range undershot
974 Diag. confirmed C Off Off User has acknowledged the message displayed in
the measuring screen.
975 Device reset C Off Off Device reset
976 PFM value high S On Off Pulse frequency modulation: output signal
exceeded/undershot. Measured value outside the
specified range.
Reasons: sensor in air, air pockets in assembly,
incorrect flow to sensor, sensor fouled
1. Clean sensor
2. Check plausibility
3. Adjust the PFM configuration.
977 PFM value low S On Off
990 Deviation limit F On On Redundancy: limit value of percentage deviation
exceeded
991 CO2 conc. range F On On CO2concentration (degassed conductivity)
outside the measuring range
992 pH calc range F On On pH calculation outside the measuring range
993 rH calc range F On On rH calculation outside the measuring range
994 Dual cond range F On On Dual conductivity outside the measuring range
No. Message Factory settings Tests or remedial measures
Cat. Diag.
on/off
Error
current

Liquiline CM442R/CM444R/CM448R Diagnostics and troubleshooting
Endress+Hauser 19
1.6.2 Sensor-specific diagnostics messages
Abbreviations used for sensor types
• P ... pH/ORP (general)
– P (glass) ... glass electrode
– P (ISFET) ... ISFET sensor
• C ... Conductivity (general)
– C (cond.) ... Conductive sensor
– C (ind.) ... Inductive sensor
• O ... Oxygen (general)
– O (opt.) ... Optical sensor
– O (amp.) ... Amperometric sensor
• N ... Nitrate
• T ... Turbidity and solids
• S ... SAC
• U ... Interface
• I ... ISE
• Cl ... Chlorine
No. Message Factory settings Sensor type Tests or remedial measures
Cat. Diag. Error
curren
t
002 Sensor unknown F On On All Replace sensor
004 Sensor problem F On On All
005 Sensor data F On On All Sensor data invalid
1. Check the firmware compatibility for the
sensor and transmitter, load suitable
firmware if necessary
2. Reset the sensor to factory setting,
disconnect the sensor and reconnect it
3. Update the transmitter date
4. Replace sensor
010 Sensor scanning F Off On All Wait for initialization to be finished
012 Writing data F On On All Could not write sensor data
1. Repeat write process
2. Replace sensor
013 Sensor type F On On All Replace sensor, making sure correct sensor
type is used
018 Sensor not ready F On On All Sensor communication blocked
1. Sensor fails tag check. Replace.
2. Internal software error. Contact Service
Department
022 Temp. sensor F On On P, C, O, I, Cl Temperature sensor defective
Replace sensor

Diagnostics and troubleshooting Liquiline CM442R/CM444R/CM448R
20 Endress+Hauser
061 Sensor electr. F On On All Sensor electronics defective
Replace sensor
062 Sensor connect. F On On All 1. Check sensor connection
2. Contact the Service Department
081 Initialization F On On All Wait for initialization to be finished
100 Sensor comm. F On On All Sensor not communicating
1. Check sensor connection
2. Check sensor plug
3. Contact the Service Department
101 Sensor incompat. F On On All 1. Update the sensor firmware
2. Replace sensor
3. Contact the Service Department
102 Calib. Timer M On Off All Calibration interval elapsed. Measurement
can still take place.
Calibrate sensor
103 Calib. timer M On Off All Calibration interval will elapse soon.
Measurement can still take place.
Calibrate sensor
104 Calib. validity M On Off All Validity of last calibration expired.
Measurement can still take place.
Calibrate sensor
105 Calib. validity M On Off All Validity of last calibration will expire soon.
Measurement can still take place.
Calibrate sensor
106 Sensor TAG F On On All Sensor has invalid tag or tag group
1. Replace sensor
2. Use new sensor with identical design
3. Deactivate tag check
107 Calib. active C On Off P, C, O, I, Cl Wait for calibration to be finished
108 Sterilization M On Off P, C, O Specified number of sterilizations will soon be
reached. Measurement can still take place.
Replace sensor
109 Sterilizat. cap M On Off O (amp.) Specified number of sterilizations for the cap
is reached. Measurement can still take place.
Replace membrane cap
110 Channel init. F On On All Initialization of channel failed, operation is
not possible
--> Contact the Service Department
No. Message Factory settings Sensor type Tests or remedial measures
Cat. Diag. Error
curren
t