Endress+Hauser Liquitrend QMW43 User manual

Products Solutions Services
Operating Instructions
Liquitrend QMW43
Conductive and capacitive measurement of conductivity
and thickness of buildup
BA01925F/00/EN/01.18
71461869
2019-12-18

Liquitrend QMW43
2 Endress+Hauser
Order code:
Ext. ord. cd.:
Ser. no.:
www.endress.com/deviceviewer Endress+Hauser
Operations App
XXXXXXXXXXXX
XXXXX-XXXXXX
XXX.XXXX.XX
Serial number
1.
3.
2.
A0023555

Liquitrend QMW43 Table of contents
Endress+Hauser 3
Table of contents
1 About this document ................ 4
1.1 Symbols .............................. 4
1.2 Terms and abbreviations ................. 5
1.3 Documentation ........................ 6
1.4 Registered trademarks ................... 6
2 Basic safety instructions ............ 6
2.1 Requirements for the personnel ............ 6
2.2 Designated use ........................ 6
2.3 Workplace safety ....................... 7
2.4 Operational safety ...................... 7
2.5 Product safety ......................... 7
2.6 IT security ............................ 7
3 Product description ................. 7
3.1 Product design ......................... 8
4 Incoming acceptance and product
identification ....................... 8
4.1 Incoming acceptance .................... 8
4.2 Product identification .................... 8
4.3 Manufacturer address ................... 9
4.4 Nameplate ........................... 9
4.5 Storage, transport ..................... 10
5 Installation ....................... 10
5.1 Installation conditions .................. 10
5.2 Mounting the measuring device ........... 11
5.3 Post-installation check .................. 12
6 Electrical connection .............. 12
6.1 Connecting the device .................. 12
6.2 Post-connection check .................. 13
7 Operation options ................. 13
7.1 IO-Link information .................... 13
7.2 IO-Link download ..................... 13
7.3 Structure of the operating menu ........... 14
8 System integration ................ 14
8.1 Process data ......................... 14
8.2 Reading out and writing device data (ISDU –
Indexed Service Data Unit) ............... 14
9 Commissioning .................... 16
9.1 Function check ....................... 16
9.2 Light signals (LEDs) .................... 16
9.3 Changing device parameters via IO-Link ..... 17
10 Operation ......................... 17
10.1 Measurement of buildup in pipes or tanks ... 17
11 Diagnostics and troubleshooting ... 19
11.1 Error indication ....................... 19
11.2 General troubleshooting ................. 19
11.3 Diagnostic information via light emitting
diodes .............................. 19
11.4 Diagnostic events ...................... 21
11.5 Behavior of the device in the event of a fault .. 23
11.6 Resetting the measuring device ........... 23
12 Maintenance ...................... 24
12.1 Cleaning ............................ 24
13 Repair ............................ 24
13.1 Return .............................. 24
13.2 Disposal ............................ 25
14 Accessories ....................... 25
14.1 Hexagon tubular socket wrench 32 mm ..... 25
14.2 Plug-in jack, elbowed 90° ................ 25
14.3 Plug-in jack, straight ................... 26
14.4 Process adapter M24 thread .............. 26
14.5 Weld-in adapter ...................... 27
14.6 Grooved union nut DIN11851 ............ 27
15 Overview of the operating menu .... 28
16 Description of Device Parameters ... 29
16.1 Identification ......................... 29
16.2 Diagnosis ........................... 29
16.3 Parameters .......................... 31
17 Technical data .................... 36
17.1 Input ............................... 36
17.2 Output ............................. 36
17.3 Performance characteristics .............. 37
17.4 Environment ......................... 39
17.5 Process ............................. 40
Index .................................. 41

About this document Liquitrend QMW43
4 Endress+Hauser
1 About this document
1.1 Symbols
1.1.1 Document function
These Operating Instructions provide all of the information that is required in various
phases of the life cycle of the device including:
• Product identification
• Incoming acceptance
• Storage
• Installation
• Connection
• Operation
• Commissioning
• Troubleshooting
• Maintenance
• Disposal
1.1.2 Safety symbols
CAUTION
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
minor or medium injury.
DANGER
This symbol alerts you to a dangerous situation. Failure to avoid this situation will result in
serious or fatal injury.
NOTICE
This symbol contains information on procedures and other facts which do not result in
personal injury.
WARNING
This symbol alerts you to a dangerous situation. Failure to avoid this situation can result in
serious or fatal injury.
1.1.3 Tool symbols
Open-ended wrench
1.1.4 Symbols for certain types of information and graphics
Permitted
Procedures, processes or actions that are permitted.
Preferred
Procedures, processes or actions that are preferred
Forbidden
Procedures, processes or actions that are forbidden.
Tip
Indicates additional information

Liquitrend QMW43 About this document
Endress+Hauser 5
Notice or individual step to be observed
Result of a step
1, 2, 3, ...
Item numbers
A, B, C, ...
Views
Safety instructions
Observe the safety instructions contained in the associated Operating Instructions
Connecting cable immunity to temperature change
Specifies the minimum value of the temperature resistance of the connection cables
1.2 Terms and abbreviations
0 mS/cm
0
LRV URV
1
2
100 mS/cm
A0041153
 1 Measuring range, span (conductivity)
1 Maximum conductivity measuring range
2 Adjusted span
Maximum conductivity measuring range
Span between 0 to 100 for editable range.
Adjusted span
Span between LRV (Lower Range Value) and URV (Upper Range Value)
The difference between the LRV and URV must be at least 1 mS/cm.
Factory setting: 0 to 100 mS/cm
Other configured spans can be ordered as customized spans.
Other abbreviations
UHT: Ultra-High Temperature
CIP: Cleaning in Place

Basic safety instructions Liquitrend QMW43
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1.3 Documentation
For an overview of the scope of the associated Technical Documentation, refer to the
following:
•W@M Device Viewer (www.endress.com/deviceviewer): Enter the serial number
from nameplate
•Endress+Hauser Operations App: Enter the serial number from the nameplate or
scan the 2D matrix code (QR code) on the nameplate
1.4 Registered trademarks
is a registered trademark of the IO-Link company group.
2 Basic safety instructions
2.1 Requirements for the personnel
The personnel must fulfill the following requirements to carry out the necessary tasks,
e. g., commissioning and maintenance:
‣Trained, qualified specialists must have a relevant qualification for the specific function
and task
‣Are authorized by the plant owner/operator
‣Are familiar with federal/national regulations
‣Must have read and understood the instructions in the manual and supplementary
documentation
‣Follow instructions and comply with conditions
2.2 Designated use
Improper use can pose hazards
‣Ensure that the measuring device is free of defects while it is in operation
‣Use the measuring device only for media to which the process-wetted materials have
an adequate level of resistance
‣Do not exceed or undershoot the relevant limit values of the measuring device → see
the "Technical data" section
2.2.1 Incorrect use
The manufacturer is not liable for damage caused by improper or non-designated use.
Clarification of borderline cases:
‣For special materials and media used for cleaning, the manufacturer is happy to
provide assistance in verifying the corrosion resistance of medium-wetted materials,
but disclaims any warranty or liability.
Residual risks
Due to heat transfer from the process, the temperature of the electronics housing and the
assemblies contained therein may rise to 80 °C (176 °F) during operation.
Danger of burns from contact with surfaces!
‣If necessary, ensure protection against contact to prevent burns.

Liquitrend QMW43 Product description
Endress+Hauser 7
2.3 Workplace safety
When working on and with the device:
‣Wear the required personal protective equipment according to federal/national
regulations.
For welding work on the piping:
‣Do not ground the welding unit via the device.
If working on and with the device with wet hands:
‣Due to the increased risk of electric shock, gloves must be worn.
2.4 Operational safety
Risk of injury!
‣Operate the device only if it is in proper technical condition, free from errors and faults.
‣The operator is responsible for ensuring the interference-free operation of the device.
Modifications to the device
Unauthorized modifications to the device are not permitted and can lead to unforeseeable
dangers.
‣If, despite this, modifications are required, consult with Endress+Hauser.
Repair
Repairs are not envisaged for this device →  "Repair" section.
2.5 Product safety
This measuring device is designed in accordance with good engineering practice to meet
state-of-the-art safety requirements, has been tested, and left the factory in a condition in
which it is safe to operate.
It meets general safety standards and legal requirements. It also complies with the EC
directives listed in the device-specific EC Declaration of Conformity. Endress+Hauser
confirms this by affixing the CE mark to the device.
2.6 IT security
We only provide a warranty if the device is installed and used as described in the
Operating Instructions. The device has safety mechanisms integrated to prevent users
from inadvertently changing settings.
Provide additional protection for the device and data transfer to/from the device
‣IT security measures defined in the plant owner/operator's own security policy must be
implemented by plant owners/operators themselves.
3 Product description
• Compact measuring device
• Continuous measurement of conductive and capacitive components of media for the
measurement of buildup thickness and conductivity
Flush-mounting of the device in pipes or in storage, mixing and process vessels enables the
optimization of CIP cleaning, UHT applications as well as process cycle times.

Incoming acceptance and product identification Liquitrend QMW43
8 Endress+Hauser
3.1 Product design
1
3
2
4
5
6
A0036957
 2 Product design
1 M12 plug
2 Plastic housing cover IP65/67
3 Metal housing cover IP66/68/69
4 Housing
5 Process connection
6 Sensor
4 Incoming acceptance and product
identification
4.1 Incoming acceptance
Check the following during incoming acceptance:
 Are the order codes on the delivery note and the product sticker identical?
 Are the goods undamaged?
 Do the nameplate data match the ordering information on the delivery note?
 If required (see nameplate): Are the safety instructions (XA) provided?
If one of these conditions is not met, please contact the manufacturer's sales office.
4.2 Product identification
The following options are available for the identification of the measuring device:
• Nameplate specifications
• Serial number
• 2-D matrix code (QR code)
• Extended order code with breakdown of the device features on the delivery note
‣Enter the serial number from the nameplates in the W@M Device Viewer
(www.endress.com/deviceviewer)
 All the information about the measuring device and all associated Technical
Documentation are displayed.

Liquitrend QMW43 Incoming acceptance and product identification
Endress+Hauser 9
‣Enter the serial number on the nameplate into the Endress+Hauser Operations App or
use the Endress+Hauser Operations App to scan the 2-D matrix code (QR Code) on the
nameplate
 All the information about the measuring device and all associated Technical
Documentation are displayed.
4.3 Manufacturer address
Endress+Hauser SE+Co. KG
Hauptstraße 1
79689 Maulburg, Germany
Address of the manufacturing plant: See nameplate.
4.4 Nameplate
Ser. no.:
Order code:
Ext. ord. cd.:
2
3
4
5
18 19
15
11
1
910
6
7
8
12
16
17
13
14
A0041309
1 Manufacturer name/logo
2 Device name
3 Manufacturer's address
4 Order code
5 Serial number
6 Extended order code
7 Supply voltage
8 Signal output
9 Process temperature
10 Ambient temperature range
11 Process pressure
12 Firmware
13 Certificate symbols, communication mode (optional)
14 Degree of protection, e. g. IP, NEMA
15 Approval-specific information
16 Measuring point identification (optional)
17 Document number of Operating Instructions
18 Manufacturing date: year-month
19 2-D matrix code (QR code)

Installation Liquitrend QMW43
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4.5 Storage, transport
4.5.1 Storage conditions
• Permitted storage temperature: –40 to +85 °C (–40 to +185 °F)
• Use original packaging.
4.5.2 Transporting the product to the measuring point
Transport the device to the measuring point in the original packaging.
5 Installation
5.1 Installation conditions
5.1.1 Mounting location
Installation in vessel, pipe or tank.
5.1.2 Vessel or tank
A0040922
 3 Installation examples
5.1.3 Pipes
A0021052
 4 Horizontal orientation → preferred orientation

Liquitrend QMW43 Installation
Endress+Hauser 11
A0038773
 5 Vertical orientation → formation of buildup or bubbles on the sensor must be taken into account
The possibility of buildup or bubbles forming on the sensor when installed vertically
must be taken into account. If the sensor is partially covered, or if encrustations or air
bubbles have formed on the sensor, this will be reflected in the measured value.
A0025915
 6 Flush mount orientation
5.1.4 Special mounting instructions
• When installing the plug, do not allow moisture to enter the plug or socket area
• Protect housing against impact
5.2 Mounting the measuring device
5.2.1 Required tools
• Open-ended wrench
• Hexagon socket wrench for measuring points that are difficult to access
When screwing into place, turn by the hex bolt only32 mm.
Torque: 15 to 30 Nm (11 to 22 lbf ft)

Electrical connection Liquitrend QMW43
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5.2.2 Installation instructions
AB
32 mm 32 mm
A0037386
 7 Installation examples
A Thread G ¾" , G 1"
B Thread M24x1.5
5.3 Post-installation check
 Is the device undamaged (visual inspection)?
 Does the device comply with the measuring point specifications?
• Process temperature
• Process pressure
• Ambient temperature range
• Measuring range
 Are the measuring point identification and labeling correct (visual inspection)?
 Is the device adequately protected against precipitation and direct sunlight?
Is the device adequately protected against impact?
Are all mounting and safety screws securely tightened?
 Is the device properly secured?
6 Electrical connection
6.1 Connecting the device
LWARNING
Risk of injury from the uncontrolled activation of processes!
‣Switch off the supply voltage before connecting the device.
‣Make sure that downstream processes are not started unintentionally.
LWARNING
Electrical safety is compromised by an incorrect connection!
‣In accordance with IEC/EN61010 a suitable circuit breaker must be provided for the
device .
‣Voltage source: Non-hazardous contact voltage or Class 2 circuit (North America).
‣The device must be operated with a fine-wire fuse 500 mA (slow-blow).
Protective circuits against reverse polarity are integrated.

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Endress+Hauser 13
C/Q1
L–
L+
21
34f
Q2 I; f
BK
BU
WH
BN
A0041101
 8 Connection
Pin 1 Supply voltage +
Pin 2 Current output 4 to 20 mA or frequency 300 to 3 000 Hz
Pin 3 Supply voltage -
Pin 4 IO-Link communication or frequency 300 to 3 000 Hz
6.2 Post-connection check
Are the device and cable undamaged (visual inspection)?
Does the supply voltage match the specifications on the nameplate?
If supply voltage is present, is the green LED lit?
With IO-Link communication: is the green LED flashing?
7 Operation options
7.1 IO-Link information
IO-Link is a point-to-point connection for communication between the device and an IO-
Link master. This requires an IO-Link compatible module (IO-Link master) for operation.
The IO-Link communication interface enables direct access to the process and diagnostic
data. It also provides the option of configuring the device during operation.
The device supports the following characteristics of the physical layer:
• IO-Link specification: version 1.1
• IO-Link Smart Sensor Profile 2nd Edition
• SIO mode: Yes
• Speed: COM2; 38.4 kBaud
• Minimum cycle time: 6 ms
• Process data width: 32 bit
• IO-Link data storage: Yes
• Block configuration: Yes
Regardless of the customer-specific default settings selected, the device always has
the option of communicating or being configured via IO-Link.
7.2 IO-Link download
http://www.endress.com/download
• Select "Device Driver" from the list displayed
• In the Type search field, select "IO Device Description (IODD)"
• In the Product Code search field, select the product root
• Click "Search" button → Select result → Download
Optional: In the Text Search search field, enter the device name.

System integration Liquitrend QMW43
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7.3 Structure of the operating menu
 "Overview of the operating menu" section →  28
8 System integration
8.1 Process data
Bit 0 (LSB) 1 ... 22 23 (MSB) 24 ... 31
Device Conductivity: 0 to 110 000 µS/cm, resolution 0.1 µS/cm Buildup: 0 to 10 mm, resolution 0.1 mm
UInt24: offset = 0, gradient = 0.1 UInt8: offset = 0, gradient = 0.1
In addition, the value for buildup and conductivity can be read via ISDU (hex) 0x0028
– acyclic service.
8.2 Reading out and writing device data (ISDU – Indexed
Service Data Unit)
Device data are always exchanged acyclically and at the request of the IO-Link master.
Using the device data, the following parameter values or device statuses can be read out:
8.2.1 Endress+Hauser-specific device data
Identifier ISDU
(dec)
ISDU
(hex)
Size
[byte]
Data type Access Default value Value range Offset/
gradient
Data
storage
Range limits
Extended order
code
259 0x0103 60 String r/-
ENP_VERSION 257 0x0101 16 String r/-
Device Type 256 0x0100 2 Uinteger16 r/- 0x91FB
Simulation
buildup
66 0x0042 1 UInt8 r/w 0 ~ OFF 0 ~ OFF
1 ~ ON
No 0 to 1
Simulated
buildup
85 0x0055 4 Int16 r/w 10 0 to 10.0 Yes 0 to 10.0
Simulation
conductivity
90 0x005A 1 UInt8 r/w 0 ~ OFF 0 ~ OFF
1 ~ ON
No 0 to 1
Simulated
conductivity
86 0x0056 4 UInt32 r/w 100 000.0 0 to 110 000.0 Yes 0 to 110 000.0
Device search 69 0x0045 1 UInt8 r/w 0 ~ OFF 0 ~ OFF
1 ~ ON
0/1 No 0 to 1
Sensor check 70 0x0046 1 UInt8 -/w 0 ~ OFF 0 ~ OFF
1 ~ ON
0/1 No 0 to 1
Operating Mode
1 (OU1)
108 0x006C 1 UInt8 r/w OFF 0 ~ OFF
3 ~ Frequency
Yes 0 to 4
Operating Mode
2 (OU2)
97 0x0061 1 UInt8 r/w 3~ Frequency
(Conductivity)
2 ~ 4-20 mA
(Buildup)
3 ~ Frequency
4 ~ 4-20 mA
(Conductivity)
Yes 0 to 4

Liquitrend QMW43 System integration
Endress+Hauser 15
Identifier ISDU
(dec)
ISDU
(hex)
Size
[byte]
Data type Access Default value Value range Offset/
gradient
Data
storage
Range limits
Damping buildup
(TAU)
106 0x006A 2 UInt16 r/w 5 0.1 to 60 s 0/0.1 Yes 1 to 600
Damping
conductivity
(TAU)
105 0x0069 2 UInt16 r/w 5 0.1 to 60 s 0/0.1 Yes 1 to 600
DC-Media 104 0x0068 2 UInt16 r/w 13 2 to 85 0/0.1 Yes 200 to 8 500
Calibrate buildup
zero (GTZ)
67 0x0043 1 UInt8 -/w 0 0 ~ Empty
1 ~ Set Zero
0 to 1
Offset buildup 98 0x0062 2 UInt16 r/w 0 0 to 10 0/0.01 Yes 1 to 90
Get DC-Media 87 0x0057 1 Uint16 -/w 0 to 1 No 0 to 1
Lower Range
Value for 4 mA
116 0x0074 4 Uint32 r/w 0.0 0 to 150000 0/0.01 Yes 1 to 150 000
Upper Range
Value for 20 mA
117 0x0075 4 Uint32 r/w 110 000 0 to 150000 0/0.01 Yes 1 to 150 000
Lower Range
Value for 300 Hz
114 0x0072 4 Uint32 r/w 0.0 0 to 150000 0/0.01 Yes 1 to 150 000
Upper Range
Value for 3000
Hz
115 0x0073 4 Uint32 r/w 110 000 0 to 150000 0/0.01 Yes 1 to 150 000
Operating hours 96 0x0060 4 UInt32 r/- 0 0 to 2^32 0/0.016667 No 0 to 2 ^32
µC-Temperature 91 0x005B 1 Int8 r/- –128 to 127 °C: 0/1
°F: 32/1.8
K: 273.15/1
No –128 to 127
Unit changeover
(UNI) - µC-
Temperature
80 0x0050 1 UInt8 r/w °C 0 ~ °C
1 ~ °F
2 ~ K
0/0 Yes 0 to 2
Minimum µC-
Temperature
92 0x005C 1 Int16 r/- 127 °C: 0/1
°F: 32/1.8
K: 273.15/1
No –
32 768 to 32 767
Maximum µC-
Temperature
93 0x005D 1 Int16 r/- -128 °C: 0/1
°F: 32/1.8
K: 273.15/1
No –
32 768 to 32 767
Reset µC-
Temperatures
[button]
94 0x005E 1 UIntegerT -/w False 0 ~ False
1 ~ Reset
Temperature
0 to 1
Please refer to the parameter description for an explanation of abbreviations.
8.2.2 IO-Link-specific device data
Identifier ISDU (dec) ISDU (hex) Size [byte] Data type Access Default value Data storage
Serial number 21 0x0015 max. 16 String r/-
Firmware Version 23 0x0017 max. 64 String r/-
ProductID 19 0x0013 max. 64 String r/- QMW43
ProductName 18 0x0012 max. 64 String r/- Liquitrend
ProductText 20 0x0014 max. 64 String r/- Buildup, homogeneity, product
recognition
VendorName 16 0x0010 max. 64 String r/- Endress+Hauser
VendorId 7 to 8 0x0007 to 0x0008 r/- 17

Commissioning Liquitrend QMW43
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Identifier ISDU (dec) ISDU (hex) Size [byte] Data type Access Default value Data storage
VendorText 17 0x0011 max. 64 String r/- People for Process Automation
Device ID 9 to 11 0x0009 to 0x000B r/- 0x000600
Hardware Revision 22 0x0016 max. 64 String r/-
Application Specific Tag 24 0x0018 32 String r/w
Actual Diagnostics (STA) 260 0x0104 4 String r/- No
Last Diagnostic (LST) 261 0x0105 4 String r/- No
8.2.3 System commands
Identifier ISDU (dec) ISDU (hex) Value range Access
Reset to factory settings (RES) 130 0x0082 -/w
Device Access Locks.Data Storage Lock 12 0x000C 0 ~ False
2 ~ True
9 Commissioning
9.1 Function check
Prior to commissioning, make sure that the post-installation and post-connection checks
have been performed.
Checklists in sections
• Post-installation check
• Post-connection check
9.2 Light signals (LEDs)
1
2
2
1
3
4
A0041157
 9 Position of LEDs in housing cover
1 green (GN), status, communication
2 red (RD), warning or fault
Description of the function of the LEDs
Position 1: green (GN) status, communication
• Lit: no communication
• Flashing: active communication, flash frequency
• Flashing with increased luminosity: device search (device identification), flash frequency

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Position 2: red (RD) warning or fault
• Warning/maintenance required:
Flashing: error is remediable, e. g. invalid adjustment
• Fault/device failure:
Lit: see diagnostics and troubleshooting
There is no external signaling via LEDs on the metal housing cover (IP69).
9.3 Changing device parameters via IO-Link
Block configuration:
All changed parameters become active only after download.
Direct configuration:
A single changed parameter becomes active immediately after input.
Confirm each change with Enter to ensure that the value is accepted.
LWARNING
Risk of injury and damage to property due to uncontrolled activation of processes!
‣Make sure that downstream processes are not started unintentionally.
Commissioning with customer-specific default settings:
The device can be put into operation without any additional configuration.
Commissioning with factory settings:
If an application-specific setting is required, the span and the output assignment can be
adjusted via the IO-Link interface.
10 Operation
10.1 Measurement of buildup in pipes or tanks
10.1.1 Application example
• System state = emptied
• Output OU1 setting on device = buildup (buildup measurement)
• Output OU2 setting on device = conductivity
The device is installed in a pipe or on a tank wall. During the process, there are times when
the pipe or tank is not filled.
For the purpose of controlling a cleaning cycle and ensuring the quality of the end product,
it is important to know whether residues of the medium or cleaning agent are still present.
The device detects the thickness of the buildup in the pipe or on the tank wall. The buildup
measurement is output as a measured value at the output used.
The thickness of the buildup can be output in the range from 0 to 10 mm, as shown in this
example.
The output is set to ≥ 0.1 mm as long as it is still possible to detect an electrical
conductivity of a medium or cleaning agent, for example.
Examples of media: biofilms, very thin, conductive films of dirt or films caused by
residue of the cleaning agent used are output with a value of 0.1 mm.
Output OU2 (set to conductivity) outputs the conductivity actually present without
temperature compensation. This makes it possible to differentiate contamination with
chemicals from the medium. Examples:

Operation Liquitrend QMW43
18 Endress+Hauser
• A very low residual conductivity in the single-digit µS/cm range is indicative of a film of
water that has not drained due to the sensor installation.
• If the residual conductivity value is far higher, this indicates fluid or cleaning agent
residue.
[ s/cm]μ
OU2
OU1
t
0
10⁴
9.5
t
0
[mm]
1.
2.
3.
4.
5.
6.
7.
7.
1. 3. 5.
2. 4. 6.
A0041350
 10 Application example: tank cleaning
Description of the graphic "Application example: tank cleaning"
At the end of a production run:
1. Tank is emptied.
 Considerable product residue in the tank.
Signal OU1: buildup ≥ 1 mm
Signal OU2: conductivity < conductivity of medium when tank is filled
2. Perform cleaning in place (CIP); rinse, e.g. with water.
3. Tank is emptied.
 Product residue still in the tank.
Signal OU1: buildup ≥ 0.1 mm
Signal OU2: conductivity < measured values from point 1, but > 0 µS/cm
4. Clean or rinse again.
5. Tank is emptied.
 Product residue still in the tank.
Signal OU1: buildup ≥ 0.1 mm
Signal OU2: conductivity < measured values from point 1, but > 0 µS/cm
6. Clean or rinse again.

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Endress+Hauser 19
7. Tank is emptied.
 The sensor no longer detects any product residue.
Signal OU1: buildup ~ 0 mm
Signal OU2: conductivity ~ 0 µS/cm
Contact your Endress+Hauser sales partner if the device is to be used in pipes or tanks
that are always filled, or to determine the homogeneity of mixtures.
11 Diagnostics and troubleshooting
11.1 Error indication
If an electronics/sensor defect is present in the device, the device changes to the error
mode and displays the diagnostic event F270 via IO-Link communication. The status of the
process data is rendered invalid.
When an error or a defect occurs, the analog outputs used (4 to 20 mA/frequency) switch
to the defined failure current/frequency range.
11.2 General troubleshooting
Device does not respond
Supply voltage does not match the value indicated on the nameplate.
‣Apply correct voltage.
The polarity of the supply voltage is wrong.
‣Correct the polarity.
Connecting cables are not in contact with the terminals.
‣Check for electrical contact between cables and correct.
No communication
Connecting cable is defective, incorrectly connected or is not making contact.
‣Check wiring and cables.
There is an error in the device, which is preventing communication.
‣Replace device.
No transmission of process data
Internal sensor error or electronics error.
‣Correct all errors that are displayed as a diagnostic event .
11.3 Diagnostic information via light emitting diodes
Green LED not lit
No supply voltage.
‣Check connector, cable and supply voltage.
LED not flashing
No communication.
‣Check connector, cable, supply voltage and IO-Link master.

Diagnostics and troubleshooting Liquitrend QMW43
20 Endress+Hauser
LED flashing red
Overload or short-circuit in load circuit.
‣Clear the short-circuit.
Ambient temperature outside of specification.
‣Operate measuring device in specified temperature range.
Red LED continuously lit
Internal sensor error.
‣Replace device.
There is no external signaling via LEDs on the metal housing cover (IP69).