Endress+Hauser Turbimax W CUS31 User manual

BA176C/07/en/08.07
71060783
Operating Instructions
Turbimax W CUS31
Turbidity sensor

Endress+Hauser

Turbimax W CUS31
Endress+Hauser 3
Table of contents
1 Safety instructions . . . . . . . . . . . . . . . . 4
1.1 Designated use . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Installation, commissioning and operation . . . . . . . . 4
1.3 Operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.4 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Notes on safety icons and symbols . . . . . . . . . . . . . . 5
2 Identification . . . . . . . . . . . . . . . . . . . . 6
2.1 Product structure . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3 Installation . . . . . . . . . . . . . . . . . . . . . . 7
3.1 Incoming acceptance, transport, storage . . . . . . . . . . 7
3.2 Installation conditions . . . . . . . . . . . . . . . . . . . . . . . 7
3.3 Installation instructions . . . . . . . . . . . . . . . . . . . . . 11
3.4 Post-installation check . . . . . . . . . . . . . . . . . . . . . . 12
4 Wiring . . . . . . . . . . . . . . . . . . . . . . . . 13
4.1 Connection to the transmitter . . . . . . . . . . . . . . . . 13
4.2 Post-connection check . . . . . . . . . . . . . . . . . . . . . . 13
5 Commissioning. . . . . . . . . . . . . . . . . . 14
5.1 Function check . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Setting the wiper . . . . . . . . . . . . . . . . . . . . . . . . . . 14
6 Maintenance. . . . . . . . . . . . . . . . . . . . 15
6.1 Cleaning the sensor . . . . . . . . . . . . . . . . . . . . . . . . 15
6.2 Checking the measuring function . . . . . . . . . . . . . 15
6.3 Checking the wiper . . . . . . . . . . . . . . . . . . . . . . . . 16
6.4 Recalibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
7 Accessories. . . . . . . . . . . . . . . . . . . . . 17
7.1 Connection accessories . . . . . . . . . . . . . . . . . . . . . 17
7.2 Installation accessories . . . . . . . . . . . . . . . . . . . . . . 17
7.3 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.4 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
7.5 Monitoring, service kit, recalibration . . . . . . . . . . . 18
8 Troubleshooting . . . . . . . . . . . . . . . . . 18
8.1 Troubleshooting instructions . . . . . . . . . . . . . . . . . 18
8.2 Checking the sensor . . . . . . . . . . . . . . . . . . . . . . . 19
8.3 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
8.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
9 Technical data . . . . . . . . . . . . . . . . . . 20
9.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.2 Performance characteristics . . . . . . . . . . . . . . . . . . 20
9.3 Environment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.4 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
9.5 Mechanical construction . . . . . . . . . . . . . . . . . . . . 21
Index . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Safety instructions Turbimax W CUS31
4Endress+Hauser
1 Safety instructions
1.1 Designated use
Turbimax W CUS31 is a sensor for nephelometric turbidity measurement in water and wastewater.
The sensor is designed for the following applications:
• All phases of drinking water processing
• Coagulation and flocculation
• Filter rupture monitoring
• Filter backwash
• Control of clear rinsing cycles
• Monitoring of phase separation processes
• Boiler feedwater
• Monitoring of cooling water
• Monitoring of surface waters
• Outlet monitoring of sewage treatment plants
• Monitoring of industrial water discharge
• Recycling of industrial water.
Any other use than the one described here compromises the safety of persons and the entire
measuring system and is, therefore, not permitted.
The manufacturer is not liable for damage caused by improper or non-designated use.
1.2 Installation, commissioning and operation
Please note the following items:
• Installation, commissioning, operation and maintenance of the measuring system must only be
carried out by trained technical personnel.
The technical personnel must be authorized for the specified activities by the system operator.
• Electrical connection must only be carried out by a certified electrician.
• Technical personnel must have read and understood these Operating Instructions and must
adhere to them.
• Before commissioning the entire measuring point, check all the connections for
correctness. Ensure that electrical cables and hose connections are not damaged.
• Do not operate damaged products and secure them against unintentional
commissioning. Mark the damaged product as being defective.
• Measuring point faults may only be rectified by authorized and specially trained
personnel.
• If faults can not be rectified, the products must be taken out of service and secured against
unintentional commissioning.
• Repairs not described in these Operating Instructions may only be carried out at the
manufacturer’s or by the service organization.
1.3 Operational safety
The sensor has been designed and tested according to the state of the art and left the factory in
perfect functioning order.
Relevant regulations and European standards have been met.
As the user, you are responsible for complying with the following safety conditions:
• Installation instructions
• Local prevailing standards and regulations.

Turbimax W CUS31 Safety instructions
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1.4 Return
If the sensor has to be repaired, please return it cleaned to the sales center responsible.
Please use the original packaging, if possible.
Please enclose the completed "Declaration of Hazardous Material and De-Contamination" (copy the
second last page of these Operating Instructions) with the packaging and the transportation
documents.
No repair without completed declaration!
1.5 Notes on safety icons and symbols
#
Warning!
This symbol alerts you to hazards. They can cause serious damage to the
instrument or to persons if ignored.
"
Caution!
This symbol alerts you to possible faults which could arise from incorrect
operation. They could cause damage to the instrument if ignored.
!Note!
This symbol indicates important items of information.

Identification Turbimax W CUS31
6Endress+Hauser
2 Identification
2.1 Product structure
2.2 Scope of delivery
The scope of delivery comprises:
• Turbidity sensor acc. to the version:
– CUS31-**A
factory-calibrated sensor, without assembly
– CUS31-**E
installed and factory-calibrated in assembly for bubble-free media,
with fixing bracket
– CUS31-**S
installed and factory-calibrated in assembly with gas bubble trap,
with fixing bracket
• Operating Instructions BA176C/07/en
If you have any questions, please contact your supplier or your sales center responsible.
Sensor
AStandardsensor
W Sensor with integr. wiper
Cable length
2 Connecting cable 7 m (23 ft)
4 Connecting cable15 m (49 ft)
9 Special cable length
Assembly
A Without assembly
E Assembly for bubblefree media
S Assembly with integr. debubbling system
CUS31- complete order code

Turbimax W CUS31 Installation
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3 Installation
3.1 Incoming acceptance, transport, storage
• Make sure the packaging is undamaged!
Inform the supplier about damage to the packaging. Keep the damaged packaging until the matter
has been settled.
• Make sure the contents are undamaged!
Inform the supplier about damage to the delivery contents. Keep the damaged products until the
matter has been settled.
• Check that the scope of delivery is complete and agrees with your order and the shipping
documents.
• The packaging material used to store or to transport the product must provide shock protection
and humidity protection. The original packaging offers the best protection. Also, keep to the
approved ambient conditions (see "Technical data").
• If you have any questions, please contact your supplier or your sales center responsible.
3.2 Installation conditions
3.2.1 Dimensions
a0008110
Fig. 1: CUS31
a0008113
Fig. 2: Sensor optics
1 Photodiode (receiver)
2 Wiper (optional)
3 Photodiode (receiver)
4 LED (IR transmitter)
Ø40 (1.57)
217 (8.54)
191 (7.52)
mm (inch
NPT ¾"
G1
34
1
2

Installation Turbimax W CUS31
8Endress+Hauser
3.2.2 Wall distance
Installing the sensor in pipework or very close to the wall can cause backscatter which results in a
higher sensor signal.
The effective wall or bottom distance can be optimized by aligning the flat sensor side.
!Note!
The following generally applies: The lower the turbidity to be measured, the darker the vessel walls
should be and the greater the wall distance should also be.
When measuring in drinking water, the wall distance to a dark wall must be at least 8 cm (3").
Bright pipes are not suitable for the drinking water sector.
a0008111
Fig. 3: CUS31-**E (with assembly E)
a0008112
Fig. 4: CUS31-**S (with assembly S)
a0008118
Fig. 5: Effect of the distance from the wall or bottom
A Dark wall or bottom (non-reflective)
B Bright wall or bottom (reflective)
275 (10.8)
396 (15.6)
19 (0.75)
¾"
mm (inch)
159 (6.26)
430 (16.9)
275 (10.8)
53 (2.09)
25 (0.98)
52 (2.05)
1¼"
mm (inch)
FNU
100
10
510 15 20
0
1
0.1
0.01
A
B
2468
cm
inch

Turbimax W CUS31 Installation
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3.2.3 Pipe installation
The following figure illustrates various installation positions in pipes and indicates whether they are
permitted or not.
a0008117
Fig. 6: Orientation and installation positions (with adapter CUA120-A/B resp. retractable assembly CUA451)
• The pipeline diameter must be at least 100 mm (4") if reflective materials (e.g. stainless steel) are
used.
• Install the sensor in places with uniform flow conditions.
• Orientate the sensor surface against the medium flow (self-cleaning effect).
• The best installation location is in the ascending pipe (→å6, it. 1). Installation is also possible
in the horizontal pipe (it. 5).
• Do not install the sensor in places where air may collect or foam bubbles form (it. 3) or where
suspended particles may settle (it. 2).
• Avoid installation in the down pipe (it. 4).
3.2.4 Flow operation
• Install the flow assembly as vertical as possible so that the medium flows to the sensor from below.
• Two sensor orientations are possible for every installation:
– Parallel to the medium flow
Orientation parallel to the medium flow is required when using the CUR 3 spray head.
– Against the medium flow
Orientation against the medium flow is used to increase the self-cleaning effect in heavily-soiled
media (> 15 FNU). The wall reflection is negligible here due to the high absorption.
!Note!
For turbidities < 5 FNU, use the sensor versions CUS31-**E or CUS31-**S.
4
5
2
2
1
3
3
a0008122
Fig. 7: Parallel to the medium flow
a0008123
Fig. 8: Against the medium flow

Installation Turbimax W CUS31
10 Endress+Hauser
3.2.5 Flow operation in the drinking water sector
(with special calibration)
When the sensor is ordered with assembly E or S, the sensor is individually calibrated in the
factory with the assembly ordered.
Therefore, no initial calibration on site is necessary.
a0008121
Fig. 9: Installation situations with flow assembly E resp. S
1. Correct: pressure reduction after measurement
Degassing is avoided. The gas in the water remains dissolved.
2. Incorrect: Pressure reduction before measurement
The pressure reduction creates favourable conditions for gas bubble formation.
3. Correct: Outlet of the assembly raised and vented
Gas cannot collect in the upper section of the assembly. The outlet pipe is vented at the highest
point. A slight overpressure forms in the assembly as a result of the height difference of the
raised outlet.
4. Incorrect: Outlet raised but not vented
A low pressure forms in the assembly if venting via the downcomer outlet pipe does not take
place due to too small a cross-section.
5. Correct: Standard application in event of little initial pressure
Slight overpressure due to raised outlet level, no gas collecting in the upper section of the
assembly.
6. Limited application: The valve reduces the volume flow
!Note!
The outlet line may not be too thin or too long as otherwise a low pressure forms in the
assembly. A vent for the drain line must be present. The outlet must be completely opened at
regular intervals as otherwise the raising of the outlet level would not make any sense.
If using a tube as the drain line, avoid formation of siphon draw (low points in the tube)!
Otherwise venting does not take place.
1 2
5 6
P
2
P
1
P
2
P
1
P
2
P
1
3 4
P
2
>P
1
P
2
<P
1
P
2
P
1
7 8
P
2
>P
1
P
2
<P
1

Turbimax W CUS31 Installation
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7. Correct: Tube as outlet line
Must be raised!
8. Incorrect: Tube not raised
A low pressure forms in the assembly which favours gas bubble formation. In addition, low
points in the tube result in siphon draw and thereby prevent venting. This results in pressure
changes in the assembly.
3.2.6 Immersion operation
When installing the sensor in immersion assemblies, please ensure that a sufficient wall distance is
observed during operation.
• For this reason, select an installation location in which a minimum wall distance of 150 mm
(6") is observed even with varying levels or altered flow profiles.
Mounting in a suspended assembly with chain must therefore be avoided.
• The sensor must immerse at least 40 mm (1.5") into the medium.
3.3 Installation instructions
3.3.1 Measuring system
A complete measuring system comprises:
• Turbidity sensor CUS31
• Transmitter, e.g. Liquisys M CUM253
• Assembly:
– Flow assembly E or S (each with installed, factory calibrated sensor) or
– Immersion assembly, e.g. Dipfit W CYA611 or
– Retractable assembly, e.g. Cleanfit W CUA451
a0008116
Fig. 10: CYA611 with pendulum frame
min. 150 (6)
min. 40 (1.57)
mm (inch)

Installation Turbimax W CUS31
12 Endress+Hauser
3.3.2 Notes on installation
Proceed as follows for complete installation of a measuring point:
1. Install the retractable or flow assembly (if used) into the process.
2. Connect the water to the rinsing nozzles (if using assembly with cleaning).
3. Install and connect the turbidity sensor.
4. Install the suspended or immersion assembly (if used) into the process.
"Caution!
• Follow national grounding regulations when using metal assemblies and installation devices.
• The sensor must be installed in an immersion assembly (e.g. CYA 611) for immersion operation.
Do not use the sensor suspended freely from the cable.
• Screw the sensor into the assembly in such a way that the cable does not become twisted.
• Avoid large traction (e.g. by tugging) on the cable.
!Note!
• Select a mounting location which can be easily accessed for later calibrations.
• When installing without an assembly, the sensor optics must be immersed at least 4 cm (1.5")
into the medium.
• Please pay special attention to the installation instructions in the Operating Instructions of the
assembly used.
3.4 Post-installation check
a0008114
Fig. 11: Measuring system with flow assembly
1 Flow assembly S
2 CUS31-**S
3 Sensor cable
4 Transmitter Liquisys M CUM253
a0008115
Fig. 12: Measuring system with immersion assembly
1 Immersion assembly Dipfit W CYA611
2 CUS31-**A
3 Transmitter Liquisys M CUM253 (with weather
protection cover CYY101)
4 Universal assembly holder CYH101
NTU
R262
0.127
FNU
12.3
C
1
23
4
1
2
3
4
Checks Info
In general:
Optical windows free of film?
Permissible orientation observed?
Medium present?
If no: cleaning (--> "Maintenance")
--> "Installation conditions"
Is the assembly or piping completely filled with medium?
Immersion assembly:
Sensor installed in immersion assembly?
Protection cap on immersion assembly?
Do not use the sensor suspended freely from the cable.
Prevent moisture penetrating the assembly!
Flow assembly/retractable assembly:
Sensor installed in flow or retractable assembly?
Ensure the sensor is aligned correctly to the flow direction!
Sensors with wiper --> "Maintenance"

Turbimax W CUS31 Wiring
Endress+Hauser 13
4 Wiring
#Warning!
• The electrical connection must only be carried out by a certified electrician.
• Technical personnel must have read and understood the instructions in this manual and must
adhere to them.
• Ensure that there is no voltage at the power cable before beginning the connection work.
4.1 Connection to the transmitter
The sensor is connected to the transmitter by means of a multi-core, shielded measuring cable (fixed
cable at the sensor.
To extend the measuring cable, a VBM or RM junction box and a CYK81 extension cable must be
used.
a0008125
Fig. 13: Measuring cable (fixed cable) resp. extension cable (CYK81)
!Note!
Please pay special attention to the instructions on sensor connection in the Operating Instructions
of the transmitter.
4.2 Post-connection check
GN
YE
WH
BN
GND
Com A
Com B
–UB
+UB
CUS31 CUM2x3
S
96
97
88
87
Instrument status and specifications Remarks
Are the sensor, assembly, junction box or cable damaged? Visual inspection
Electrical connection Remarks
Does the supply voltage of the transmitter match the
specifications on the nameplate?
110/230 V AC
24 V AC/DC
Are the installed cables strain-relieved and not twisted?
Is the cable type route completely isolated? Power cable/signal cable
Are the power supply and signal cable correctly connected to
the transmitter?
Use the connection diagram of
CxM2x3.
Are all the screws terminals properly tightened?
Are all the cable entries installed, tightened and sealed? For lateral cable entries : cable loops
downwards for water to be able to drip
off.
Are all the cable entries installed downwards or lateral?

Commissioning Turbimax W CUS31
14 Endress+Hauser
5 Commissioning
5.1 Function check
Before first commissioning, check if:
• the sensor ist correctly installed
• the electrical connection is correct.
#Warning!
Danger of medium leaking off
Before applying compressed air to an assembly with cleaning facility, make sure the connections are
correctly fitted. Otherwise, the assembly may not be insert into the process.
5.2 Calibration
Each sensor is calibrated in the factory according to standard procedures (ISO 7027 / EN 27027).
The wavelength of 880 nm is in the near-infrared range.
The sensor zero point adjustment relates to almost particle-free water (particles < 0.2 μm). The
calibration data are saved internally in the sensor as data record 1 and are also documented at the
factory by means of the serial number (data cannot be modified).
You can operate the sensor in the “formazine” transmitter operating mode using the factory
calibration. The calibration data are automatically taken over by the transmitter once the sensor is
connected to the Liquisys M CUM2x3 transmitter and power-up takes place. The measuring point
is immediately operational.
You can save some calibration data as data record 2 or 3 (data changeable) without losing the factory
calibration in data record 1.
!Note!
• Please pay special attention to the instructions on wall distance.
An installation adjustment, (see Operating Instructions BA200C/07/en Liquisys M CUM2x3),
may have to be performed.
•For drinking water applications, versions CUS31-**E or CUS31-**S:
The sensor is already installed in the assembly and is calibrated with the assembly. Recalibration
at a later stage is always performed in conjunction with the assembly.
5.3 Setting the wiper
!Note!
Only for versions CUS31-W**!
You can set the wiping duration and the wiping intervals via the transmitter, (see
Liquisys M CUM2x3 Operating Instructions).
The factory setting specifies a wiping time of 30 seconds and an interval of 120 minutes. These
settings are optimum for drinking water applications with little gas-bubble formation. This prevents
film formation from the build-up of lime, metal oxides etc. and biological growth.
The interval time must be reduced to 20 or 30 minutes for more heavily-soiled media (higher levels
of lime, oxide and biological growth). The wiping time can be reduced to 20 seconds.
Rapidly-forming gas bubbles which distort the measurements can occur in some applications. In
such instances, set the interval time to 3 to 5 minutes and the wiping time to 5 seconds. In most
cases the gas bubbles can be removed by turning the wiper once.
"Caution!
Never move the wiper manually!

Turbimax W CUS31 Maintenance
Endress+Hauser 15
6 Maintenance
You must carry out maintenance tasks at regular intervals. For this, specify the maintenance times
in an operations logbook or operations calendar.
The following tasks must be carried out:
• Cleaning the sensor
• Checking the measuring function
• Checking the wiper
• Recalibration
You can find the description of the mentioned maintenance tasks in the following chapters.
6.1 Cleaning the sensor
Contamination of the sensor can impact the measurement up to the point that measurement no
longer functions, e.g. by:
• Thick film build-up on the sensor optics
Film build-ups can cause bad measurement results.
• Wiper clogging
Causes bad measurement results.
The sensor must be cleaned regularly to ensure reliable measurement. The frequency and intensity
of the cleaning depend on the medium.
The sensor must be cleaned:
• prior to every calibration
• if necessary, regularly during the operation
• prior to returning the sensor for repair.
"Caution!
After cleaning, rinse the sensor with water.
!Note!
For automatic cleaning we recommend equipping the measuring point with a fully-automatic
cleaning system, e.g. Chemoclean (Accessories).
6.2 Checking the measuring function
1. Remove the sensor from the medium.
2. Clean and dry the sensor.
3. Check the slope using CUY22 check unit. A stable measured value (between 2 and 6 FNU)
must register. The exact value is not of importance but must be repeatable for the same sensor.
!Note!
If measuring at air, a reliable measured value will not register (due to undefined refractive
conditions).
Type of contamination Cleaning measures
Lime deposits Immerse the sensor in 1-5 % hydrochloric acid (a few
minutes).
Dirt particles on the optics Mechanically clean the sensor head with water and a
suitable brush or sponge.
Fibres on the wiper axis Remove manually.

Maintenance Turbimax W CUS31
16 Endress+Hauser
6.3 Checking the wiper
!Note!
Only for versions CUS31-W**
Remove the sensor from the medium and carry out the following checks:
6.4 Recalibration
At the factory
• Remove the sensor (versions CUS31-**E/S including the assembly) and send it cleaned to your
supplier or to your supplier resp. to your E+H sales centre for recalibration (order no. 50081264).
• Please use the original packaging, if possible.
• Enclose of a copy of the duly completed Declaration of decontamination (second-last page of these
Operating Instructions) with the packaging and delivery documents.
• Recalibration is carried out in the factory as per ISO 7027 / EN 27027 (traceable to formazine
standard).
On-site
You have the following options in the ''Calibration'' menu of the transmitter:
• One-point calibration
• Three-point calibration
• Installation adjustment
• Correction function
• Adjust calibration data
!Note!
Please refer to the Operating Instructions of the Liquisys M CUM2x3 transmitter for detailed
instructions!
Visual inspection • Is the wiper still present?
• Is the cap on the screw still present?
• Is the screw or wiper arm secure?
• What is the condition of the wiper rubber?
Replace missing or worn parts. If necessary, retighten the screw (holding the wiper arm in
position).
Function checks When voltage is applied, the wiper moves to the end position (at the side of the optical
windows).
The check can be carried out using the ''AUTO'' key of the Liquisys M CUM2x3
transmitter.
Enter Code 22, press the Fkey and then keep the \key pressed until the wiper
function appears on the display. The wiper can be switched on or off using the Oor S
keys. The wiper should not turn 360 °, but should only go from end position to end
position and back.

Turbimax W CUS31 Accessories
Endress+Hauser 17
7 Accessories
7.1 Connection accessories
CYK81 measuring cable
• Non-terminated measuring cable for extension of sensor cables of e.g. Memosens,
CUS31/CUS41
• 2 wires, twisted pair with shield and PVC-sheath (2 x 2 x 0.5 mm2+ shield)
• Sold by the meter, order no. 51502543
Junction box VBM
• For cable extension
•10terminals
• Cable entries: 2 x Pg 13.5 or 2 x NPT ½"
• Material: aluminum
• Ingress protection: IP 65 (iNEMA 4X)
• Order numbers:
– cable entries Pg 13.5: 50003987
– cable entries NPT ½": 51500177
Junction box RM
• For cable extension (e.g. for Memosens sensors or CUS31/CUS41)
•5terminals
• Cable entries: 2 x Pg 13.5
• Material: PC
• Ingress protection: IP 65 (iNEMA 4X)
• Order no.: 51500832
7.2 Installation accessories
Immersion assembly holder CYH101
• For pH, ORP, oxygen, conductivity assemblies and for oxygen and turbidity sensors;
• Ordering acc. to product structure (Technical Information TI092C/07/en)
Immersion assembly Dipfit W CYA611
• For sensor immersion in basins, open channels and tanks, PVC
• Ordering acc. to product structure, see Technical Information TI166C/07/en
Flange adapter CUA120
• for CUS31/CUS41
• Ordering information:
– CUA120-A for welding flange, h=47 mm (1.85")
– CUA120-B for welding flange, h=93 mm (3.66")
Flow assembly Flowfit CUA250
• for CUS31/CUS41
• ordering acc. to product structure (Technical Information TI096C/07/en)
Retractable assembly Cleanfit CUA451
• retractable assembly with ball valve; for turbidity sensors; material: stainless steel
• ordering acc. to product structure (Technical Information TI369C/07/en)
Welding rinse socket DN 65
• order no. 51500912
Welding rinse socket DN 50 / PN 16
• order no. 55001306

Troubleshooting Turbimax W CUS31
18 Endress+Hauser
7.3 Transmitter
Liquisys M CUM 223/253
• Turbidity transmitter
• Panel mounting or field housing
• Optional with Hart®or Profibus communication
• Ordering acc. to product structure, see Technical Information TI200C/07/en
7.4 Cleaning
Chemoclean
• Injector CYR10 and program sequencer CYR20
• Ordering acc. to product structure, see Technical Information (TI046C/07/en)
Chemoclean CUR3
• Spray head for flow assemblies CUA250 and COA250
• order no. CUR3-1
7.5 Monitoring, service kit, recalibration
CUY22
• Check unit for CUS31 for checking the sensor
• order no. 51504477
Service kit CUY31
• 3 spare wiper arms
• order no. 50089252
Recalibration CUS31
• Calibration as per ISO 7027 / EN 27027
• order no. 50081264
8Troubleshooting
8.1 Troubleshooting instructions
Troubleshooting must take account of the whole measuring system:
• Transmitter
• Electrical leads and connectors
•Assembly
•Sensor
The possible causes of failure listed in the following table primarily refer to the sensor.
Problem Check Remedy
No display, no sensor
reaction
Mains voltage at transmitter?
Sensor connected correctly?
Medium flow present?
Film formation on optical windows?
Connect mains voltage.
Set up correct connection.
Create flow.
Clean the sensor.
Reading too high or
too low
Film formation on optical windows?
Gas bubbles present?
Sensor calibrated?
Check data record.
Check with check unit.
Clean the sensor.
Remove gas bubbles.
Calibrate.
Change, if necessary.
Check in factory.
Reading greatly
fluctuating
Gas bubbles present?
Check mounting location.
Remove gas bubbles.
Select other mounting location.

Turbimax W CUS31 Troubleshooting
Endress+Hauser 19
!Note!
Please pay special attention to the instructions on handling errors in the Operating Instructions of
the transmitter. Check the transmitter, if necessary.
8.2 Checking the sensor
"Caution!
The sensor may only be checked by authorised and specially trained personnel.
You also require a voltmeter.
!Note!
If the values deviate from the set points, carry out trouble-shooting as per the trouble-shooting
instructions or contact your sales center.
8.3 Return
If the sensor has to be repaired, please return it cleaned to the sales center responsible.
Please use the original packaging, if possible.
Please enclose the completed "Declaration of Hazardous Material and De-Contamination" (copy the
second last page of these Operating Instructions) with the packaging and the transportation
documents.
No repair without completed declaration!
8.4 Disposal
The device contains electronic components and must therefore be disposed of in accordance with
regulations on the disposal of electronic waste.
Please observe local regulations.
Measured value jump to
9999 FNU
Gas bubble formation on the optical
windows?
Change orientation. Adjust wiper interval.
Increase gas bubble factor in Liquisys M
CUM2x3 menu.
Error 8 Water in sensor?
Cable breakage?
Incorrect cable connection?
Send sensor to service.
Check cable.
Check wiring.
Wiper does not find end
position
Visual inspection: Initial position not in end
position?
Send sensor to service.
Problem Check Remedy
Check Measure Set point
Voltage check Check supply voltage at transmitter (sensor
connected)
10 to 16 V between terminals 87 and 88
Slope check Check slope using CUY22 check unit Stable measured value (1 to 6 FNU)
Zero point check Produce zero water by filtration (0.2 μm) < 0.1 FNU

Technical data Turbimax W CUS31
20 Endress+Hauser
9 Technical data
9.1 Input
Measuring principle nephelometric acc. to ISO 7027 / EN 27027
Measured variable Turbidity
Measuring range 0.000 to 9999 FNU
0.00 to 3000 ppm
0.0 to 3.0 g/l
0.0 to 200 %
9.2 Performance characteristics
Maximum measured error < 5 % (min. 0.02 FNU) of measured value
(system measured error related to the primary formazine standard / tracing according to ISO 5725
and ISO 7027 / EN 27027)
Repeatability < 1 % (min. 0.01 FNU) of measured value
Wavelength 880 nm
Factory calibration traceable to formazine standard and SiO2
9.3 Environment
Storage temperature -20 to 60 °C (0 to 140 °F)
Ingress protection IP 68
9.4 Process
Process temperature range –5 to 50 °C (20 to 120 °F)
Process pressure 1 to 6 bar (15 to 87 psi)