Endress+Hauser Memosens COS81E User manual

Products Solutions Services
Operating Instructions
Memosens COS81E
Hygienic, optical sensor with Memosens 2.0 technology
for the measurement of oxygen
BA02066C/07/EN/01.20
71496967
2020-09-02

Memosens COS81E Table of contents
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Table of contents
1 About this document ................ 4
1.1 Warnings ............................ 4
1.2 Symbols used .......................... 4
1.3 Supplementary documentation ............. 4
2 Basic safety instructions ............ 6
2.1 Requirements for personnel ............... 6
2.2 Designated use ........................ 6
2.3 Workplace safety ....................... 6
2.4 Operational safety ...................... 6
2.5 Product safety ......................... 7
3 Product description ................. 8
3.1 Measuring principle ..................... 8
3.2 Product design ......................... 9
3.3 Stabilization time ....................... 9
3.4 Memosens technology .................. 10
4 Incoming acceptance and product
identification ..................... 11
4.1 Incoming acceptance ................... 11
4.2 Product identification ................... 11
4.3 Scope of delivery ...................... 12
4.4 Certificates and approvals ............... 12
5 Installation ....................... 13
5.1 Installation conditions .................. 13
5.2 Mounting the sensor ................... 14
5.3 Installation examples ................... 16
5.4 Post-installation check .................. 19
6 Electrical connection .............. 20
6.1 Connecting the sensor .................. 20
6.2 Ensuring the degree of protection .......... 20
6.3 Post-connection check .................. 20
7 Commissioning .................... 21
7.1 Function check ....................... 21
7.2 Calibration and adjustment .............. 21
8 Diagnostics and troubleshooting ... 25
8.1 General troubleshooting ................. 25
9 Maintenance ...................... 26
9.1 Maintenance schedule .................. 26
9.2 Maintenance tasks ..................... 26
10 Repair ............................ 28
10.1 General information ................... 28
10.2 Return .............................. 28
10.3 Spare parts .......................... 28
10.4 Disposal ............................ 32
10.5 Checking the measurement function ....... 32
11 Accessories ....................... 33
11.1 Device-specific accessories ............... 33
12 Technical data .................... 36
12.1 Input ............................... 36
12.2 Performance characteristics .............. 36
12.3 Environment ......................... 36
12.4 Process ............................. 37
12.5 Mechanical construction ................ 37

About this document Memosens COS81E
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1 About this document
1.1 Warnings
Structure of information Meaning
LDANGER
Causes (/consequences)
If necessary, Consequences of
non-compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation will result in a fatal or serious
injury.
LWARNING
Causes (/consequences)
If necessary, Consequences of
non-compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation can result in a fatal or serious
injury.
LCAUTION
Causes (/consequences)
If necessary, Consequences of
non-compliance (if applicable)
‣Corrective action
This symbol alerts you to a dangerous situation.
Failure to avoid this situation can result in minor or more serious injuries.
NOTICE
Cause/situation
If necessary, Consequences of
non-compliance (if applicable)
‣Action/note
This symbol alerts you to situations which may result in damage to
property.
1.2 Symbols used
Symbol Meaning
Additional information, tips
Permitted or recommended
Not permitted or not recommended
Reference to device documentation
Reference to page
Reference to graphic
 Result of a step
1.2.1 Symbols on the device
Symbol Meaning
Reference to device documentation
1.3 Supplementary documentation
The following manuals which complement these Operating Instructions can be found on
the product pages on the Internet:
• Technical Information for the relevant sensor
• Operating Instructions for the transmitter used
• Operating Instructions for the cable used

Memosens COS81E About this document
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In addition to these Operating Instructions, an XA with "Safety instructions for electrical
apparatus in the hazardous area" is also included with sensors for use in the hazardous
area.
‣Please follow instructions on use in the hazardous area carefully.
Safety instructions for electrical apparatus in hazardous areas, Memosens 2.0 optical
oxygen for ATEX and IECEx approval: XA02238C

Basic safety instructions Memosens COS81E
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2 Basic safety instructions
2.1 Requirements for personnel
• Installation, commissioning, operation and maintenance of the measuring system may
be carried out only by specially trained technical personnel.
• The technical personnel must be authorized by the plant operator to carry out the
specified activities.
• The electrical connection may be performed only by an electrical technician.
• The technical personnel must have read and understood these Operating Instructions
and must follow the instructions contained therein.
• Faults at the measuring point may only be rectified by authorized and specially trained
personnel.
Repairs not described in the Operating Instructions provided must be carried out only
directly at the manufacturer's site or by the service organization.
2.2 Designated use
Use of the device for any purpose other than that described, poses a threat to the safety of
people and of the entire measuring system and is therefore not permitted.
The manufacturer is not liable for damage caused by improper or non-designated use.
2.3 Workplace safety
As the user, you are responsible for complying with the following safety conditions:
• Installation guidelines
• Local standards and regulations
• Regulations for explosion protection
Electromagnetic compatibility
• The product has been tested for electromagnetic compatibility in accordance with the
applicable international standards for industrial applications.
• The electromagnetic compatibility indicated applies only to a product that has been
connected in accordance with these Operating Instructions.
2.4 Operational safety
Before commissioning the entire measuring point:
1. Verify that all connections are correct.
2. Ensure that electrical cables and hose connections are undamaged.
3. Do not operate damaged products, and protect them against unintentional operation.
4. Label damaged products as defective.
During operation:
‣If faults cannot be rectified:
products must be taken out of service and protected against unintentional operation.

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2.5 Product safety
2.5.1 State-of-the-art technology
The product is designed 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. The relevant regulations and
international standards have been observed.

Product description Memosens COS81E
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3 Product description
3.1 Measuring principle
Sensor structure
Oxygen-sensitive molecules (markers) are integrated into the optically active layer
(luminescence layer).
The luminescence layer, an optical insulating layer and a cover layer are applied on top of
one another on the carrier. The cover layer is in direct contact with the medium.
The sensor optics are directed at the rear of the carrier and therefore at the luminescence
layer.
Measurement process (principle of luminescence quenching)
If the sensor is immersed in the medium, an equilibrium is very quickly established
between the oxygen partial pressure in both the medium and the luminescence layer.
1. The sensor optics send orange light pulses to the luminescence layer.
2. The markers "respond" (luminesce) with dark-red light pulses.
 The decay time and intensity of the response signals are directly dependent on
the oxygen contents and oxygen partial pressure.
If the medium is free from oxygen, the response signals are long and very intense.
If the medium is free from oxygen, the decay time is long and the signal is very intense.
Any oxygen molecules present mask the marker molecules. As a result, the decay time is
shorter and the signals are less intense.
Measurement result
‣The sensor calculates the measurement result on the basis of the signal intensity and
decay time using the Stern-Volmer equation.
The air pressure can be either set statically or entered via an additional sensor. The
medium temperature is automatically recorded in the sensor. Both values are taken into
consideration in the calculation of the oxygen concentration.
The sensor provides measured values for temperature and partial pressure as well as a raw
measured value. This value corresponds to the luminescence decay time and is approx.
14 μs in air and approx. 56 μs in oxygen-free media.
For optimum measurement results
1. During calibration, enter the current air pressure at the transmitter.
2. If the calibration is not performed at Air 100% rh:
Enter the current humidity.
3. In the case of saline media:
Enter the salinity.
4. For measurements in the units %Vol or %SAT:
Also enter the current operating pressure in the measuring mode.
Observe the documentation of the transmitter used:
• Operating Instructions for Memosens: BA01245C
For all transmitters, analyzers and samplers in the Liquiline CM44x/P/R, Liquiline
System CA80XX and Liquistation CSFxx product families
• Operating Instructions for Liquiline CM42, BA00381C and BA00382C
• Operating Instructions for Liquiline Mobile CML18: BA02002C
• Operating Instructions for Liquiline Compact CM82: BA01845C
• Operating Instructions for Liquiline Compact CM72: BA01797C

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3.2 Product design
1 2 34
67
8 5
A0027181
 1 Memosens COS81E
1
2
3
4
Memosens plug-in head with optics assembly
Thrust collar
Sensor shaft
O-ring sensor shaft
5
6
7
8
Spot cap
Optical waveguide with temperature sensor
Process seal 10.77 x 2.62 mm
Process connection Pg 13.5
The suitability of the selected materials for use in the process must be assessed during
the product configuration.
Process conditions that go beyond the resistance range of the materials may shorten
the operating life of the materials and make maintenance necessary.
3.2.1 Spot cap
The oxygen dissolved in the medium is diffused to the luminescence layer of the spot cap.
A suitable flow is not required, as no oxygen is consumed during measurement. However,
flow improves the speed at which the measuring system reacts and ensures a more
representative measured value compared to a measurement in a static medium.
The spot is permeable for dissolved gases only. Other substances dissolved in the liquid
phase, such as ionic substances, will not penetrate through the membrane. Therefore,
medium conductivity has no impact on the measuring signal.
The sensor's spot cap can have either a c-shaped or u-shaped design.
12
A0034733
 2 Design of spot cap
1 u-shaped
2 c-shaped
3.3 Stabilization time
The measuring method used by the sensor is temperature-dependent. For this reason, the
temperature of the sensor must be adapted to the medium temperature during
commissioning. You obtain reliable measured values once a stable temperature value is
reached.
The temperature usually adapts very quickly in aqueous media. Temperature adaptation
can take several minutes in gaseous media.

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3.4 Memosens technology
Sensors with Memosens protocol have an integrated electronics unit that stores calibration
data and other information. Once the sensor has been connected, the sensor data are
transferred automatically to the transmitter and used to calculate the measured value.
‣Call up the sensor data via the corresponding DIAG menu.
Digital sensors can store measuring system data in the sensor. These include the following:
• Manufacturer data
• Serial number
• Order code
• Date of manufacture
• Calibration data
• Calibration date
• Calibration values
• Number of calibrations
• Serial number of the transmitter used to perform the last calibration or adjustment
• Operating data
• Temperature application range
• Date of initial commissioning
• Hours of operation under extreme conditions

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4 Incoming acceptance and product
identification
4.1 Incoming acceptance
1. Verify that the packaging is undamaged.
 Notify the supplier of any damage to the packaging.
Keep the damaged packaging until the issue has been resolved.
2. Verify that the contents are undamaged.
 Notify the supplier of any damage to the delivery contents.
Keep the damaged goods until the issue has been resolved.
3. Check that the delivery is complete and nothing is missing.
 Compare the shipping documents with your order.
4. Pack the product for storage and transportation in such a way that it is protected
against impact and moisture.
 The original packaging offers the best protection.
Make sure to comply with the permitted ambient conditions.
If you have any questions, please contact your supplier or your local Sales Center.
4.2 Product identification
4.2.1 Nameplate
The nameplate provides you with the following information on your device:
• Manufacturer identification
• Order code
• Extended order code
• Serial number
• Safety information and warnings
• Certificate information
‣Compare the information on the nameplate with the order.
4.2.2 Product identification
Product page
www.endress.com/cos81e
Order code
The order code and serial number of your product can be found in the following locations:
• On the nameplate
• In the delivery papers
Obtaining information on the product
1. Go to www.endress.com.
2. Call up the site search (magnifying glass).
3. Enter a valid serial number.
4. Search.
 The product structure is displayed in a popup window.

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5. Click on the product image in the popup window.
 A new window (Device Viewer) opens. All of the information relating to your
device is displayed in this window as well as the product documentation.
4.2.3 Manufacturer's address
Endress+Hauser Conducta GmbH+Co. KG
Dieselstraße 24
D-70839 Gerlingen
4.3 Scope of delivery
The scope of delivery comprises:
• 1 sensor, version as ordered
• 1 x Brief Operating Instructions
• Safety instructions for the hazardous area (for sensors with Ex approval)
• Optional certificates that have been ordered
4.4 Certificates and approvals
4.4.1  mark
The product meets the requirements of the harmonized European standards. As such, it
complies with the legal specifications of the EU directives. The manufacturer confirms
successful testing of the product by affixing to it the  mark.
4.4.2 EAC
The product has been certified according to guidelines TP TC 004/2011 and TP TC
020/2011 which apply in the European Economic Area (EEA). The EAC conformity mark
is affixed to the product.

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5 Installation
5.1 Installation conditions
5.1.1 Dimensions
Pg 13,5
50 (1.97) 120 / 160 / 220 / 320 / 420 (4.7 / 6.3 / 8.7 / 12.6 / 16.5)*
12 - 0.1
(0.47)
A0043883
 3 Dimensions in mm (inch)
5.1.2 Orientation
The sensor's spot cap can have either a c-shaped or u-shaped design.
12
A0034733
 4 Design of spot cap
1 u-shaped
2 c-shaped
COS81E-****C*** (c-shaped)
135°
225°
45°
315°
0° 180°
A0042948
 5 Installation angle Memosens COS81E-****C*** (c-shaped spot cap)
The sensor can be installed at any installation angle (0 to 360 °).
Recommended installation angle

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The sensor with the c-shaped spot cap is self-draining in the recommended installation
angles and can therefore be used for hygienic applications.
COS81E-****U*** (u-shaped)
45°
135°
45°
0° 180°
A0042949
 6 Installation angle Memosens COS81E-****U*** (u-shaped spot cap)
Recommended installation angle
Possible installation angle
Inadmissible installation angle
The sensor with the u-shaped spot cap must be installed at an inclination angle of 0
to 180˚ in an assembly, holder or a corresponding process connection. Recommended
angle: 0 to 45° or 135 to 180 ° to prevent the attachment of air bubbles. At angles of
inclination of 45 to 135°, air bubbles at the oxygen-sensitive membrane may increase the
measured value.
Inclination angles other than those mentioned are not permitted. In order to avoid buildup
and condensation on the spot, do not install the COS81E-****U *** sensor upside down.
Follow the instructions for installing sensors in the Operating Instructions for the
assembly used.
5.1.3 Mounting location
1. Choose a mounting location that is easy to access.
2. Ensure that upright posts and assemblies are fully secured and vibration-free.
3. Choose a mounting location with an oxygen concentration that is typical for the
application.
5.2 Mounting the sensor
5.2.1 Measuring system
A complete measuring system comprises:
• a Memosens COS81E oxygen sensor
• Measuring cable CYK10
• A transmitter, e.g. Liquiline CM42, Liquiline CM44x/R, Liquiline CM44P, Liquiline
Compact CM72/82, Liquiline Mobile CML18
• Optional: an assembly, e.g. permanent installation assembly CPA842, flow assembly or
retractable assembly CPA875
• Optional: connection to an analog fermenter controller via the Memosens analog
converter CYM17

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1 2
3
4
A0029064
 7 Example of a measuring system with Memosens COS81E
1 Retractable assembly CPA875
2 Liquiline CM42 transmitter
3 Measuring cable CYK10
4 Oxygen sensor Memosens COS81E
5.2.2 Installing at a measuring point
Must be installed in a suitable assembly (depending on the application).
LWARNING
Electrical voltage
In the event of a fault, non-grounded metallic assemblies may be live and as such are not
safe to touch!
‣When using metallic assemblies and installation equipment, national grounding
provisions must be observed.
For complete installation of a measuring point, proceed as follows:
1. Install the retractable assembly or a flow assembly (if used) into the process.
2. Connect the water supply to the rinse connections (if you are using an assembly with
a cleaning function).
3. Install and connect the oxygen sensor.

Installation Memosens COS81E
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NOTICE
Installation error
Cable breakage, loss of sensor due to cable separation, unscrewing of spot cap!
‣Do not install the sensor freely suspended from the cable!
‣Screw the sensor into the assembly, ensuring that the cable is not twisted.
‣Hold the sensor body steady during installation or removal. Turn only at the
hexagonal nut of the armored coupling. Otherwise the spot cap might be unscrewed
and will then remain in the assembly or process.
‣Avoid exerting excessive tensile force on the cable (e.g. through jerky pulling
movements).
‣Choose a mounting location that is easy to access for later calibrations.
‣Follow the instructions for installing sensors in the Operating Instructions for the
assembly used.
5.3 Installation examples
5.3.1 Permanent installation Unifit CPA842
The permanent installation assembly CPA842 enables easy adaptation of a sensor to
nearly any process connections from Ingold nozzles to Varivent or Tri-Clamp connections.
This kind of installation is very well suited for tanks and larger pipes. This enables a
defined immersion depth of the sensor into the medium in the simplest way.
5.3.2 Flow assembly CYA680
The flow assembly is available in various nominal diameters and materials. It can be
installed both in horizontal and vertical pipes. The assembly can be operated with 1 or 2
sensors.
1
2
2
A0042963
 8 Flow assembly CYA680
1 Flow chamber of assembly
2 Installed sensor Memosens COS81E
5.3.3 Flow assembly Flowfit CYA21 for water treatment and
processes
The compact stainless steel assembly offers space for a 12-mm sensor with a length of
120 mm. The assembly has a low sampling volume and, with the 6-mm connections, it is

Memosens COS81E Installation
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best suited for residual oxygen measurement in water treatments and boiler feedwater.
The flow comes from below.
1 2
3
4
A0014081
 9 Flow assembly
1 Installed sensor Memosens COS81E
2 Drain
3 Wall mount (clamp D29)
4 Inflow
5.3.4 Retractable assembly Cleanfit CPA875 or Cleanfit CPA450
The assembly is designed for installation on tanks and pipes. Suitable nozzles must be
available for this.
Install the assembly in a place with uniform flow conditions. The minimum pipe diameter
is DN 80.

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Installation position for COS81E-****U*** (with u-shaped spot cap)
A
A*
5
3
4
1
2
3
4
2
A0042966
 10 Suitable and unsuitable installation positions for Memosens COS81E with u-shaped spot cap and
retractable assembly
1 Ascending pipe, best position
2 Horizontal pipe, sensor top down, impermissible due to air cushion or foam bubble forming
3 Horizontal pipe, lateral installation, with suitable installation angle
4 Upside-down installation, unsuitable
5 Down pipe, impermissible
A Detail A (top view)
A* Detail A, turned by 90° (side view)
Possible installation angle
Inadmissible installation angle
Installation position for COS81E-****C*** (with c-shaped spot cap)
A
A*
5
3
4
1
2
3
4
2
A0042965
 11 Suitable and unsuitable installation positions for Memosens COS81E with c-shaped spot cap and
retractable assembly
1 Ascending pipe, best position
2 Horizontal pipe, sensor top down, impermissible due to air cushion or foam bubble forming
3 Horizontal pipe, lateral installation with permissible installation angle (acc. to sensor version)
4 Upside-down installation, only in conjunction with c-shaped spot cap
5 Down pipe, impermissible
Possible installation angle
Inadmissible installation angle
NOTICE
Sensor not in the medium all the way, buildup, upside-down installation
These can all cause incorrect measurements!
‣Do not install assembly at points where air pockets or bubbles may form.
‣Avoid or regularly remove buildup on the spot cap.
‣Do not install the sensor COS81E-****U (u-shaped) upside down.

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5.4 Post-installation check
1. Are the sensor and cable undamaged?
2. Is the orientation correct?
3. Is the sensor installed in an assembly and is not suspended from the cable?
4. Avoid the penetration of moisture by fitting the protection cap on the immersion
assembly.

Electrical connection Memosens COS81E
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6 Electrical connection
LWARNING
Device is live!
Incorrect connection may result in injury or death!
‣The electrical connection may be performed only by an electrical technician.
‣The electrical technician must have read and understood these Operating Instructions
and must follow the instructions contained therein.
‣Prior to commencing connection work, ensure that no voltage is present on any cable.
6.1 Connecting the sensor
The electrical connection of the sensor to the transmitter is established using measuring
cable CYK10.
GN/YE
YE
GN
BN
WH
GND
+
–
Com A
Com B
GY
A0024019
 12 Measuring cable CYK10
6.2 Ensuring the degree of protection
Only the mechanical and electrical connections which are described in these instructions
and which are necessary for the required, designated use, may be carried out on the device
delivered.
‣Exercise care when carrying out the work.
Otherwise, the individual types of protection (Ingress Protection (IP), electrical safety, EMC
interference immunity) agreed for this product can no longer be guaranteed due,
for example to covers being left off or cable (ends) that are loose or insufficiently secured.
6.3 Post-connection check
Device condition and specifications Action
Are the sensor, assembly or cables free from damage on
the outside?
‣Perform a visual inspection.
Electrical connection Action
Are the mounted cables strain-relieved and not twisted? ‣Perform a visual inspection.
‣Untwist the cables.
Is a sufficient length of the cable cores stripped, and are
the cores positioned in the terminal correctly?
‣Perform a visual inspection.
‣Pull gently to check they are seated correctly.
Are all the screw terminals properly tightened? ‣Tighten the screw terminals.
Are all cable entries mounted, tightened and leak-tight? In the case of lateral cable entries:
‣Point cable loops downward so that water can
drip off.
Are all cable entries installed downwards or mounted
laterally?