BA02066C/07/EN/02.21
71521590
2021-03-22

Products

Solutions

Services

Operating Instructions
Memosens COS81E
Hygienic, optical sensor with Memosens 2.0 technology
for the measurement of oxygen

Memosens COS81E

Table of contents

Table of contents
1

About this document . . . . . . . . . . . . . . . . 4

1.1
1.2
1.3

Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Symbols used . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Supplementary documentation . . . . . . . . . . . . . 5

10.2 Spare parts and consumables . . . . . . . . . . . . . 29
10.3 Return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.4 Spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.5 Checking the measurement function . . . . . . . 33
10.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

2

Basic safety instructions . . . . . . . . . . . . 6

2.1
2.2
2.3
2.4
2.5

Requirements for personnel . . . . . . . . . . . . . . . 6
Designated use . . . . . . . . . . . . . . . . . . . . . . . . 6
Workplace safety . . . . . . . . . . . . . . . . . . . . . . . 6
Operational safety . . . . . . . . . . . . . . . . . . . . . . 7
Product safety . . . . . . . . . . . . . . . . . . . . . . . . . 7

11Accessories . . . . . . . . . . . . . . . . . . . . . . . 34

11.1

Device-specific accessories . . . . . . . . . . . . . . . 34

12Technical data . . . . . . . . . . . . . . . . . . . . 37

3

Product description . . . . . . . . . . . . . . . . . 8

3.1
3.2
3.3
3.4

Measuring principle . . . . . . . . . . . . . . . . . . . . . 8
Product design . . . . . . . . . . . . . . . . . . . . . . . . . 9
Stabilization time . . . . . . . . . . . . . . . . . . . . . . 10
Memosens technology . . . . . . . . . . . . . . . . . . 10

4Incoming acceptance and productidentification . . . . . . . . . . . . . . . . . . . . . 11

4.1
4.2
4.3
4.4

Incoming acceptance . . . . . . . . . . . . . . . . . . . 11
Product identification . . . . . . . . . . . . . . . . . . . 11
Scope of delivery . . . . . . . . . . . . . . . . . . . . . . 12
Certificates and approvals . . . . . . . . . . . . . . . 12

5

Installation . . . . . . . . . . . . . . . . . . . . . . . 15

5.1
5.2
5.3
5.4

Installation conditions . . . . . . . . . . . . . . . . . . 15
Mounting the sensor . . . . . . . . . . . . . . . . . . . 16
Installation examples . . . . . . . . . . . . . . . . . . . 17
Post-installation check . . . . . . . . . . . . . . . . . . 20

6Electrical connection . . . . . . . . . . . . . . 21

6.1
6.2
6.3

Connecting the sensor . . . . . . . . . . . . . . . . . . 21
Ensuring the degree of protection . . . . . . . . . . 21
Post-connection check . . . . . . . . . . . . . . . . . . 21

7

Commissioning . . . . . . . . . . . . . . . . . . . . 22

7.1
7.2

Function check . . . . . . . . . . . . . . . . . . . . . . .
Calibration and adjustment . . . . . . . . . . . . . .

8

Diagnostics and troubleshooting . . . 26

8.1

General troubleshooting . . . . . . . . . . . . . . . . . 26

9Maintenance . . . . . . . . . . . . . . . . . . . . . . 27

9.1
9.2

Maintenance schedule . . . . . . . . . . . . . . . . . . 27
Maintenance tasks . . . . . . . . . . . . . . . . . . . . . 27

10

Repair . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

10.1 General notes . . . . . . . . . . . . . . . . . . . . . . . .
Endress+Hauser

12.1 Input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.2 Performance characteristics . . . . . . . . . . . . . .
12.3 Environment . . . . . . . . . . . . . . . . . . . . . . . . .
12.4 Process . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12.5 Mechanical construction . . . . . . . . . . . . . . . .

37
37
37
38
38

22
22

29
3

About this document

Memosens COS81E

1

About this document

1.1

Warnings

Structure of information

Meaning

LDANGERThis symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation will result in a fatal or serious
injury.

Causes (/consequences)If necessary, Consequences of
non-compliance (if applicable)‣ Corrective action

LWARNING
Causes (/consequences)If necessary, Consequences of
non-compliance (if applicable)‣ Corrective action

LCAUTION
Causes (/consequences)If necessary, Consequences of
non-compliance (if applicable)‣ Corrective action
NOTICE
Cause/situation
If necessary, Consequences of
non-compliance (if applicable)‣ Action/note

1.2
SymbolThis symbol alerts you to a dangerous situation.
Failure to avoid the dangerous situation can result in a fatal or serious
injury.

This symbol alerts you to a dangerous situation.
Failure to avoid this situation can result in minor or more serious injuries.

This symbol alerts you to situations which may result in damage toproperty.

Symbols used
Meaning
Additional information, tips
Permitted or recommended
Not permitted or not recommended
Reference to device documentation
Reference to page
Reference to graphic



1.2.1
SymbolResult of a step

Symbols on the device
Meaning
Reference to device documentation

Do not dispose of products bearing this marking as unsorted municipal
waste. Instead, return them to the manufacturer for disposal under theapplicable conditions.

4

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Memosens COS81E

About this document

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
In addition to these Operating Instructions, an XA with "Safety instructions for electricalapparatus in the hazardous area" is also included with sensors for use in the hazardousarea.

‣ Please follow instructions on use in the hazardous area carefully.
Safety instructions for electrical equipment in hazardous areas, Memosens 2.0 optical
oxygen:• ATEX and IECEx: XA02238C• INMETRO: XA02475C• NEPSI: XA02476C• JPN Ex: XA02485C• CSA C/US: XA02520C

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5Basic safety instructions

Memosens COS81E

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

The sensor is designed for continuous measurement of dissolved oxygen in water andaqueous solutions, and also for continuous measurement of oxygen in gases.
The sensor is particularly suitable for:• Monitoring inertization equipment in the food industry• Monitoring, measuring and regulating the oxygen content in chemical processes• Monitoring of fermentation processes
NOTICE
Halogen-containing solvents, ketones and toluene
Halogen-containing solvents (dichloromethane, chloroform), ketones (e.g. acetone,
pentanone) and toluene have a cross-sensitive effect and result in decreased measured
values or, at worst, in the complete failure of the sensor!
‣ Use the sensor only in media that are free from halogens, ketones and toluene.
For non-contact digital data transmission, the sensor must be connected to the digital
input of the transmitter for Memosens sensors using the CYK10 measuring cable.
Use of the device for any purpose other than that described, poses a threat to the safety ofpeople 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 theapplicable international standards for industrial applications.
• The electromagnetic compatibility indicated applies only to a product that has beenconnected in accordance with these Operating Instructions.

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Memosens COS81E

Basic safety 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.

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, andleft the factory in a condition in which it is safe to operate. The relevant regulations andinternational standards have been observed.

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7

Product description

Memosens COS81E

3

Product description

3.1

Measuring principle

3.1.1

Optical 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 luminescencelayer.
Measurement process (principle of luminescence quenching)
If the sensor is immersed in the medium, an equilibrium is very quickly establishedbetween 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 isshorter and the signals are less intense.
Measurement result‣ The sensor calculates the measurement result on the basis of the signal intensity anddecay 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

8

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.

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Memosens COS81E

Product description

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

3.2

Product design
1

2

3

4

8

7

6

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.

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9Product description

Memosens COS81E

1

2
A0034733

2
1
2

Design of spot cap
u-shapedc-shaped

3.3

Stabilization time

The measuring method used by the sensor is temperature-dependent. For this reason, thetemperature of the sensor must be adapted to the medium temperature duringcommissioning. You obtain reliable measured values once a stable temperature value isreached.
The temperature usually adapts very quickly in aqueous media. Temperature adaptation
can take several minutes in gaseous media.

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 aretransferred automatically to the transmitter and used to calculate the measured value andfor Heartbeat functions.

‣ 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• Digital sensor label• Calibration data of the last eight calibrations including factory calibration withcalibration date and calibration values• Serial number of the transmitter used to perform the last calibration• Possibility to reset to factory calibration• In the case of sensors with replaceable measuring elements, the number of calibrations
per measuring element and for the entire sensor• Application data
• Temperature application range• Date of initial commissioning• Hours of operation under extreme conditions• Number of sterilizations and CIP cycles
All Memosens 2.0 E sensors offer these advantages with the latest Liquiline transmitter
software. All Memosens 2.0 sensors are backwards-compatible with previous software
versions and offer the usual advantages of Memosens D-generation devices.

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Memosens COS81E

Incoming acceptance and product identification

4

Incoming acceptance and productidentification

4.1

Incoming acceptance1.

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 protectedagainst 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 pagewww.endress.com/cos81e
Interpreting the 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 productEndress+Hauser

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.

11

Incoming acceptance and product identification

5.

Memosens COS81E

Click on the product image in the popup window.
 A new window (Device Viewer) opens. All of the information relating to yourdevice is displayed in this window as well as the product documentation.

4.2.3

Manufacturer 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)• Supplement for optional certificates that have been ordered

4.4

Certificates and approvals

Certificates and approvals are optional, i.e. they depend on the product version.

4.4.1

 markThe product meets the requirements of the harmonized European standards. As such, itcomplies 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

Ex approvals

COS81E-BG
ATEX II 1G Ex ia op is IIC T6… T3 Ga
COS81E-B4
ATEX II 1G Ex ia op is IIC T6… T3 Ga
ATEX II 1D Ex ia op is IIIC T90°C… T200°C Da
COS81E-IF
IECEx Ex ia op is IIC T6… T3 Ga
COS81E-I5
IECEx Ex ia op is IIC T6… T3 Ga
IECEx Ex ia op is IIIC T90°C… T200°C Da
COS81E-NG
NEPSI Ex ia op is IIC T6/T4/T3 Ga
COS81E-N5
NEPSI Ex ia op is IIC T6/T4/T3 Ga
NEPSI Ex iaD op is 20 T90/T135/T200
COS81E-MG
INMETRO Ex ia op is IIC T6 … T3 Ga
COS81E-M5
INMETRO Ex ia op is IIC T6 … T3 Ga
INMETRO Ex ia op is IIIC T90°C… T200°C Da
COS81E-JF
JPN Ex ia op is IIC T6…T3 Ga

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Memosens COS81E

Incoming acceptance and product identification

COS81E-J5
JPN Ex ia op is IIC T6…T3 Ga
JPN Ex ia op is IIIC T90°C… T200°C Da
COS81E-CI
CSA C/US IS Class I Division 1 Groups A, B, C and D T6…T4
CSA C/US Ex ia IIC T6…T4 Ga
CSA C/US Class I Zone 0 AEx ia IIC T6…T4 Ga

4.4.3

Hygienic compatibility

Regulation (EC) No. 1935/2004
Meets the requirements of Regulation (EC) No. 1935/2004
The product therefore meets the requirements for materials that come into contact with
food.
EHEDG
The hygienic sensor is certified according to EHEDG Type EL-Class I.

4.4.4

Pharmaceutical compatibility

ASME BPE
Produced according to the criteria of the ASME BPE that is currently valid.
Compliance with requirements derived from cGMP
Certificate of conformity for pharmaceutical requirements, confirms conformity withbiological reactivity test USP 87, USP 88 Class VI, FDA material conformity, TSE-/BSE-free,surface roughness
FDA compatibility
All parts in contact with medium comply with the relevant regulations of the FDA.
Hazardous area versions
For operation in FDA processes, another FDA-approved seal must be installed before
the process seal (for example Unifit CPA842). Doing so will sufficiently separate theprocess from the Ex connection.

4.4.5

Additional certification

Inspection certificate in accordance with EN 10204 3.1
A test certificate 3.1 in accordance with EN 10204 is supplied depending on the version (→Product Configurator on the product page).

4.4.6

Other standards and guidelines

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 markis affixed to the product.

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Incoming acceptance and product identification

Memosens COS81E

CRN approval
As the sensor can be operated at a nominal pressure greater than 15 psi (approx. 1 bar), it
has been registered according to CSA B51 ("Boiler, pressure vessel, and pressure pipingcode"; category F) with a CRN (Canadian Registration Number) in all Canadian provinces.

4.4.7

Test reports

Manufacturer's certificate
Stating the individual final test data
Surface roughness test
Stainless steel surfaces in contact with medium tested to ≤ Ra 0.38 µm.

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Memosens COS81E

Installation

5

Installation

5.1

Installation conditions

5.1.1

Dimensions
120 / 160 / 220 / 320 / 420 (4.7 / 6.3 / 8.7 / 12.6 / 16.5)*

12 - 0.1(0.47)

50 (1.97)

Pg 13,5

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.

1

2
A0034733

4
1
2

Design of spot cap
u-shapedc-shaped

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 theapplication.

5.1.4

Hygienic requirements

The use of an EHEDG-certified assembly is a prerequisite for the easy-to-clean installationof a 12-mm sensor in accordance with EHEDG requirements.
Furthermore, the instructions regarding the hygienic installation and operation of theassembly in the relevant Operating Instructions must be adhered to.
The Special Documentation for hygienic applications must be observed for hygienic
operation.

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15

Installation

Memosens COS81E

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. Unifit CPA842 fixed installation assembly , Flowfit CYA21
flow assembly or Cleanfit CPA875 retractable assembly• Optional: connection to an analog fermenter controller via the Memosens analog
converter CYM17
1

2

4

3

A0029064

5
1
2
3
4

Example of a measuring system with Memosens COS81E
Retractable assembly Cleanfit CPA875
Liquiline CM42 transmitter
Measuring cable CYK10Oxygen 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 notsafe to touch!
‣ When using metallic assemblies and installation equipment, national grounding
provisions must be observed.

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Memosens COS81E

Installation

For complete installation of a measuring point, proceed as follows:1.

Install the retractable assembly or flow assembly (if used) in the process2.

Connect the water supply to the rinse connections (if you are using an assembly witha cleaning function)

3.

Connect the cable to the sensor and transmitter4.

Supply power to the transmitter

5.

Install and connect the oxygen sensor in the assembly

NOTICE
Incorrect installation
Cable open circuit, 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 thehexagonal 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 theassembly used.

5.3

Installation examples

5.3.1

Permanent installation Unifit CPA842

The permanent installation assembly CPA842 enables easy adaptation of a sensor tonearly 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 adefined 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 beinstalled both in horizontal and vertical pipes. The assembly can be operated with 1 or 2
sensors.
1

2

2
A0042963

6
1
2

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Flow assembly CYA680
Flow chamber of assemblyInstalled sensor Memosens COS81E

17

Installation

Memosens COS81E

5.3.3

Flow assembly Flowfit CYA21 for water treatment andprocesses

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 isbest suited for residual oxygen measurement in water treatments and boiler feedwater.
The flow comes from below.

1

2

4

3

A0014081

7
1
2
3
4

Flow assemblyInstalled sensor Memosens COS81E
Drain
Wall mount (clamp D29)
Inflow

5.3.4

Retractable assembly Cleanfit CPA875 or Cleanfit CPA450

The assembly is designed for installation on vessels 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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Memosens COS81E

Installation

Installation position for COS81E-****U*** (with u-shaped spot cap)
2
2
A
3

3
4
1

5
A*

4

A0042966

8
1
2
3
4
5
A
A*

Suitable and unsuitable installation positions for Memosens COS81E with u-shaped spot cap andretractable assembly
Ascending pipe, best position
Horizontal pipe, sensor top down, impermissible due to air cushion or foam bubble forming
Horizontal pipe, lateral installation, with suitable installation angle
Upside-down installation, unsuitable
Down pipe, impermissible
Detail A (top view)
Detail A, turned by 90° (side view)

Possible installation angle
Inadmissible installation angle
Installation position for COS81E-****C*** (with c-shaped spot cap)
2
2
A
3

3
1

4
5
A*

4

A0042965

9
1
2
3
4
5

Suitable and unsuitable installation positions for Memosens COS81E with c-shaped spot cap andretractable assembly
Ascending pipe, best position
Horizontal pipe, sensor top down, impermissible due to air cushion or foam bubble forming
Horizontal pipe, lateral installation with permissible installation angle (acc. to sensor version)
Upside-down installation, only in conjunction with c-shaped spot cap
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.
Endress+Hauser

19Installation

Memosens COS81E

5.4

20

Post-installation check1.

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.

Endress+Hauser

Memosens COS81E

Electrical connection

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 themeasuring cable CYK10.
GY GNDYE Com B
GN Com A
WH –
BN +

EY/NG

A0024019

 10

6.2

Measuring cable CYK10

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

Endress+Hauser

Post-connection check

Device condition and specifications

Action

Are the sensorprocess spectrometer, assembly orcables 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, andare 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 leaktight?

‣ Perform a visual inspection.

Are all cable entries installed downwards or mounted
laterally?

‣ Point cable loops downward so that water can drip

In the case of lateral cable entries:
off.

21

Commissioning

Memosens COS81E

7

Commissioning

7.1

Function check

Prior to initial commissioning, ensure that:• The sensor is correctly installed• The electrical connection is correct
If using an assembly with automatic cleaning function:‣ Check that the cleaning medium (water or air, for example) is connected correctly.
LWARNING
Escaping process medium
Risk of injury from high pressure, high temperatures or chemical hazards!
‣ Before applying pressure to an assembly with cleaning system, ensure that the system
has been connected correctly.
‣ If you cannot reliably establish the correct connection, do not install the assembly inthe process.
1.

At the transmitter, enter all the settings specific to the parameters and measuring
point. These include the air pressure during calibration and measurement or thesalinity, for instance.

2.

Check whether a calibration/adjustment is necessary.

The oxygen measuring point is then ready to measure.
Following commissioning, the sensor must be serviced at regular intervals, as only
then can reliable measurement be guaranteed.
Operating Instructions for the transmitter used, such as BA01245C if using the
Liquiline CM44x or Liquiline CM44xR.

7.2

Calibration and adjustment

The sensor is calibrated and adjusted in the factory prior to delivery and is therefore readyfor immediate use.
A recalibration or readjustment is required in the following situations:• Changes due to process conditions, e.g. for Cleaning in Place (CIP), Sterilization in Place(SIP) and autoclaving• Changes due to stress: temperature and/or chemicals (cleaning)• Following a spot cap replacement
Recommended procedure after replacing a spot cap
First calibrate and adjust the sensor at the zero point and then in the presence ofoxygen.
Calibration and adjustment can also be monitored or renewed cyclically (at typical timeintervals, depending on operating experience), e.g. within the context of systemmonitoring.

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Memosens COS81E

Commissioning

7.2.1

Types of calibration

The following types of calibration are possible:• Zero point• Single-point calibration in nitrogen or COY8 zero-point gel• Numeric input• Point at oxygen• Air, water vapor-saturated (recommended)• Air-saturated water• Air, variable• Test gas calibration• Numeric input• Sample calibration• Fermenter scaling• Temperature adjustment• Spot cap replacement

7.2.2

Zero point calibration

The zero point is not so important when working with relatively high concentrations ofoxygen. In these types of application, a zero point calibration is required only after the spot
cap has been replaced.
However, once oxygen sensors are used at low concentrations and in the trace range, theymust also be calibrated at the zero point.
Zero point calibrations are demanding as the ambient medium - usually air - already has ahigh oxygen content. This oxygen must be excluded for zero point calibration of thesensor.
A calibration with zero-point gel COY8 can be used for this purpose:
The oxygen-depleting gel COY8 creates an oxygen-free medium for zero point calibration.
Prior to sensor zero point calibration, check the following:• Is the sensor signal stable?
• Has the adjustment time of 30 min - 40 min for the zero-point gel COY8 elapsed?
• Is the value displayed plausible?
1.

If the sensor signal is stable:
Calibrate the zero point.

2.

If necessary:
Adjust the sensor by accepting the calibration data.
If the oxygen sensor is calibrated too early, this can result in an incorrect zero point.
Rule of thumb: operate the sensor for at least 30 min in the COY8 zero-point gel.
Follow the instructions in the kit documentation enclosed with the COY8 zero-point
gel.

7.2.3

Endress+Hauser

Calibration in oxygen with 100% rH

1.

Remove the sensor from the medium.

2.

Clean the outside of the sensor carefully with a damp cloth.

3.

Suspend the sensor just above the surface of the water.
Do not immerse the sensor.

4.

Allow a temperature compensation time of approx. 20 minutes for the sensor in theambient air. Make sure that the sensor is not exposed to any direct ambient effects(direct sunlight, drafts) during this time.

23

Commissioning

Memosens COS81E

5.

Is the measured value display on the transmitter stable:
Perform the calibration in accordance with the Operating Instructions for thetransmitter. Pay particular attention to the software settings for the stability criteria
for calibration and for the ambient pressure.

6.

Where necessary:
Adjust the sensor by accepting the calibration data.

7.

Then place the sensor back into the medium.

8.

Deactivate the hold status at the transmitter.

‣ Follow the calibration instructions in the Operating Instructions for the transmitterused.

The constants Ksv and Tau0 of the Stern-Volmer equation are determined at both
calibration points (point in oxygen and zero point). The calibration quality index
provides an indication of the quality of the calibration in relation to the first reference
calibration of the spot cap. Therefore it is important to run the Change sensor cap
command in the calibration menu of the transmitter before every initial calibration ofa spot cap.

7.2.4

Calculation example for the calibration value

As a check, you can calculate the expected calibration value (transmitter display) as shownin the following example (salinity is 0).
1.

Determine the following:• Ambient temperature for the sensor (air temperature in the case of the Air 100% rh or
Air variable calibration methods, water temperature in the case of the H2O airsaturated calibration method)• The altitude above sea level• The current air pressure (= relative air pressure based on sea level) at the time ofcalibration. (If indeterminable, use 1013 hPa.)2.

Determine the following:• The saturation value S acc. to Table 1• The altitude factor K acc. to Table 2
Table 124T
[˚C (˚F)]

S[mg/l=ppm]

T[˚C (˚F)]

S[mg/l=ppm]

T[˚C (˚F)]

S[mg/l=ppm]

T[˚C (˚F)]

S[mg/l=ppm]

0 (32)

14.64

11 (52)

10.99

21 (70)8.90

31 (88)7.42

1 (34)

14.23

12 (54)

10.75

22 (72)8.73

32 (90)7.30

2 (36)

13.83

13 (55)

10.51

23 (73)

8.57

33 (91)7.18

3 (37)

13.45

14 (57)

10.28

24 (75)

8.41

34 (93)7.06

4 (39)

13.09

15 (59)10.06

25 (77)

8.25

35 (95)6.94

5 (41)

12.75

16 (61)9.85

26 (79)8.11

36 (97)

6.83

6 (43)

12.42

17 (63)

9.64

27 (81)

7.96

37 (99)6.72

7 (45)

12.11

18 (64)9.45

28 (82)

7.82

38 (100)

6.61

8 (46)

11.81

19 (66)

9.26

29 (84)

7.69

39 (102)

6.51

9 (48)

11.53

20 (68)9.08

30 (86)

7.55

40 (104)

6.41

10 (50)11.25

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Memosens COS81E

Commissioning

Table 2
Altitude[m (ft)]K

Altitude[m (ft)]

K

0 (0)

1.000

550 (1800)

0.938

1050 (3450) 0.885

1550 (5090) 0.834

50 (160)

0.994

600 (1980)

0.932

1100 (3610) 0.879

1600 (5250) 0.830

100 (330)

0.988

650 (2130)

0.9271150 (3770) 0.874

1650 (5410) 0.825

150 (490)

0.982

700 (2300)

0.9221200 (3940) 0.869

1700 (5580) 0.820

200 (660)

0.977

750 (2460)

0.9161250 (4100) 0.864

1750 (5740) 0.815

250 (820)

0.971

800 (2620)

0.911

1300 (4270) 0.859

1800 (5910) 0.810

300 (980)

0.966

850 (2790)

0.905

1350 (4430) 0.854

1850 (6070) 0.805

350 (1150)

0.960

900 (2950)

0.900

1400 (4600) 0.849

1900 (6230) 0.801

400 (1320)

0.954

950 (3120)

0.895

1450 (4760) 0.844

1950 (6400) 0.796

450 (1480)

0.9491000 (3300) 0.890

1500 (4920) 0.839

2000 (6560) 0.792

500 (1650)

0.943

3.

K

Altitude[m (ft)]K

Calculate factor L:

L=
4.

Altitude[m (ft)]Relative air pressure at calibration----------------------------------------------1013 hPa

Determine the M factor:• M = 1.02 (for Air 100% rh calibration method)• M = 1.00 (for H2O air-saturated calibration method)
5.

Calculate calibration value C:
C=

S.K.L.M

Example• Air calibration at 18 °C (64 °F), altitude 500 m (1650 ft) above sea level, current airpressure 1009 hPa• S = 9.45 mg/l, K = 0.943, L = 0.996, M=1.00• Calibration value C = 8.88 mg/l.
Factor K in the table is not required if the measuring device returns the absolute airpressure L abs (air pressure depending on altitude) as the measured value. The formulafor calculation is then: C = S . Labs.

7.2.5

Measured value filter

In the sensor setup of the transmitter (e.g. CM44x Release 1.09.00 and higher), different
measured value filters can be configured for COS81E and saved in the sensor.
The following measured value filters are available:• Standard
Responsive filter that quickly captures all changes in the oxygen content (default)• Life science• Standard: optimized filter for use of the sensor in fermenter applications• Strong: strong filter for use of the sensor in fermenter applications in which oxygen
regulation is complicated by small accumulations of air bubbles on the sensor due tothe consistency of the medium

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25

Diagnostics and troubleshooting

Memosens COS81E

8

Diagnostics and troubleshooting

8.1

General troubleshooting‣ If one of the following problems is present:
Check the measuring system in the order shown.
Problem

Check

Solution

Nothing displayed, noreaction from the sensor

Power supplied to thetransmitter?

‣ Establish the power supply.
‣ Switch on channel on transmitter.

Sensor cable connected
correctly?

‣ Establish correct connection.

Buildup on the spot cap?

‣ Clean the spot cap or luminescence layer
carefully with a soft cloth.

Displayed value too highDisplayed value too low

Display value fluctuating

Is sensor calibrated/adjusted? ‣Measured value in air not 100± 2 %SAT?

Recalibrate/readjust.
 When calibrating, enter the current airpressure at the transmitter.

Displayed temperature clearly ‣too low?

Check the sensor, contact the Service
Department if necessary.

Is sensor calibrated/adjusted? ‣Measured value in air not 100± 2 %SAT?

Recalibrate/readjust.
 When calibrating, enter the current airpressure at the transmitter.

Displayed temperature clearly ‣too high?

Check the sensor, contact the Service
Department if necessary.

Are there air bubbles on the
spot cap?

1.

Change the installation angle.

2.

If necessary, change the cap type from a ushaped to a c-shaped cap.

Display in Vol% or %SAT
not plausible

Medium pressure has notbeen taken into account‣ Enter medium pressure on transmitter.

F005 after transmitter
replacement

Measured value filter settingchanged?

Update the transmitter to the most recent software
version or, on the transmitter with the latest
software version, adjust the filter setting to themedium again and continue using the oldertransmitter software.

Pay attention to the troubleshooting information in the Operating Instructions for thetransmitter.
Check the transmitter if necessary.

26

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Memosens COS81E

Maintenance9

MaintenanceTake all the necessary precautions in time to ensure the operational safety and reliabilityof the entire measuring system.
NOTICE
Effects on process and process control!
‣ When carrying out any work on the system, bear in mind any potential impact this
could have on the process control system and the process itself.
‣ For your own safety, only use genuine accessories. With genuine parts, the function,accuracy and reliability are also ensured after maintenance work.

9.1

Maintenance schedule

Maintenance cycles depend to a great extent on the operating conditions.
The following rule of thumb applies:• Constant conditions, e.g. power plant = long cycles (1/2 year)• Widely varying conditions, e.g. daily CIP or SIP cleaning, fluctuating process pressure =short cycles (1 month and shorter)
The following method helps you determine the necessary intervals:
1.

Inspect the sensor one month after commissioning. To do so, remove the sensor fromthe medium and dry it carefully.

2.

Visually check the spot cap.
 There should be no green coloration or air bubbles visible on the exterior.
Otherwise, replace the spot cap.

3.

After 10 minutes, measure the oxygen saturation index in air.
 Decide using the results:a) Measured value not 100 ± 2 % SAT? → Service the sensor.
b) Measured value = 100 ± 2 % SAT? → Double the length of time to the next
inspection.

4.

Proceed as indicated in Step 1 after two, four and eight months.
 This allows you to determine the optimum maintenance interval for your sensor.
Particularly in the case of widely fluctuating process conditions, damage may occur tothe luminescence layer even within a maintenance cycle. You can recognize this byimplausible sensor behavior.

9.2

Maintenance tasks

The following tasks must be performed:
1.

Clean the sensor and spot cap.

2.

Replace wear parts or consumables.

3.

Check measurement function.

4.

Recalibrate (if desired or necessary).
 Follow the Operating Instructions for the transmitter.

9.2.1

Cleaning exterior of sensor

The measurement can be corrupted by sensor fouling or malfunction due to the following,for example:
Buildup on the spot cap This causes a longer response time.
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27

Maintenance

Memosens COS81E

The sensor must be cleaned at regular intervals for reliable measurement results. The
frequency and intensity of the cleaning process depend on the medium.
Clean the sensor:• Before every calibration• At regular intervals during operation as necessary• Before returning it for repair
Type of contamination

Cleaning

Salt deposits

1.

Immerse the sensor in drinking water.

2.

Then rinse it with copious amounts of water.

Dirt particles on the sensor shaft and shaft
sleeve (not spot cap!)‣ Clean sensor shaft and sleeve with water and a suitable

Dirt particles on the spot cap‣ Clean the spot cap with water. No mechanical cleaning.

sponge.

‣ After cleaning:
Rinse with copious amounts of clean water.

9.2.2

Clean the sensor optics

The optics need to be cleaned only if there is visible buildup on the optical waveguide orboundary area.

A0043084

A0043085

A0043086

1.

Unscrew the spot cap from the sensor head.

2.

Carefully clean the optical surface with a soft cloth until the buildup is fully removed.
If necessary wet the cloth with drinking water or distilled water (preferably use thecleaning cloth supplied with the COV81 maintenance kit) .

3.

Dry the optical surface and screw on a functioning spot cap.

4.

At the transmitter, execute the Sensor cap change command and then perform thenecessary calibrations.

NOTICE
Damage, scratches on optical surface
Distorted measured values‣ Make sure that the optical surface is not scratched or damaged in any other way.

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Memosens COS81E

Repair10

Repair

10.1

General notes‣ Only use spare parts from Endress + Hauser to guarantee the safe and stablefunctioning of the device.

Detailed information on the spare parts is available at:www.endress.com/device-viewer

10.2

Spare parts and consumables

Memosens COV81• Maintenance kit for COS81E• Scope of delivery of the Memosens COV81 maintenance kit is based on theconfiguration:• Spot cap• O-ring mounting tool
• Cleaning cloth for optics• O-rings• Certificate• Ordering information: www.endress.com/cos81e under "Accessories/spare parts"

10.3

ReturnThe product must be returned if repairs or a factory calibration are required, or if thewrong product was ordered or delivered. As an ISO-certified company and also due to legal
regulations, Endress+Hauser is obliged to follow certain procedures when handling any
returned products that have been in contact with medium.
To ensure the swift, safe and professional return of the device:‣ Refer to the website www.endress.com/support/return-material for information on theprocedure and conditions for returning devices.

The product must be returned if repairs or a factory calibration are required, or if thewrong product was ordered or delivered.
To ensure safe, professional and swift product returns, please contact your local Sales
Center for information on the procedure to be followed and general conditions.

10.4

Spare parts

Parts of the sensor are subject to wear during operation. By taking suitable measures, you
can restore the normal operating function.

Endress+Hauser

Corrective action

ReasonReplace process seals

Visible damage to a process seal

Replace spot cap• Luminescence layer is damaged or can no longer be cleaned• Visible damage to the O-ring29

Repair

Memosens COS81E

1

2

3

4

8

7

6

5
A0027181

 11

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.
The sensor's spot cap can have either a c-shaped or u-shaped design.

1

2
A0034733

 12
1
2

Design of spot cap

u-shapedc-shaped

10.4.1

Replacing sealing rings

It is compulsory to replace the sealing ring if it is visibly damaged. Only use original sealing
rings.
The following O-rings can be replaced:• Sealing ring for shaft sleeve: item 4• Sealing ring towards process (conductive for Ex): item 8 7
Replacing the sealing ring for the shaft sleeve
1.

A0043010

Unscrew spot cap and remove.

30

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Memosens COS81E

Repair

2.

A0034713

Remove the old O-ring above the thread on the shaft.
3.

A0034715

Push the mounting tool from below onto the shaft until it sits over the thread.
4.

A0034717

Slide the new O-ring over the mounting tool into the position above the thread.
5.

A0043012

Remove the mounting tool.
6.

A0043015

Clean the sensor optics carefully using the cloth provided.

Endress+Hauser

31Repair

Memosens COS81E

7.

A0043011

Screw on the spot cap.
Replacing the sealing ring towards the process
1.

A0043013

Remove the old O-ring on the process connection in the direction of the spot cap.
2.

A0043014

Fit the new O-ring over the spot cap and push it as far as the process connection.

10.4.2

Replacing the spot cap

The spot cap must be replaced if it is visibly damaged or the sensor measurement quality is
not sufficient. Only use original spot caps.
1.

A0043010

Unscrew the old spot cap and remove.
2.

A0043015

Clean the sensor optics carefully using the cloth provided.

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Memosens COS81E

Repair3.

Reset the cap counters.
 Warnings can be configured for the spot cap counters to assist with sensor
maintenance.

4.

A0043011

Screw on the new spot cap.
5.

Calibrate the sensor or check the measuring function.→  22

10.5

Checking the measurement function

1.

Remove the sensor from the medium.

2.

Clean and dry the .

3.

After about 10 minutes, measure the oxygen saturation index in air (without
recalibration).
 The measured value should be at 100 ± 2 % SAT.

10.6

Disposal

If required by the Directive 2012/19/EU on waste electrical and electronic equipment(WEEE), the product is marked with the depicted symbol in order to minimize thedisposal of WEEE as unsorted municipal waste. Do not dispose of products bearing thismarking as unsorted municipal waste. Instead, return them to Endress+Hauser for
disposal under the applicable conditions.

Endress+Hauser

33

Accessories

Memosens COS81E

11

Accessories

The following are the most important accessories available at the time this documentation
was issued.

‣ For accessories not listed here, please contact your Service or Sales Center.

11.1

Device-specific accessories

11.1.1

Assemblies (selection)

COS81E with 220 mm length is suitable for all assemblies requiring an installation
length of 225 mm.
Cleanfit CPA875• Retractable process assembly for sterile and hygienic applications• For in-line measurement with standard sensors with 12 mm diameter, e.g. for pH, ORP,
oxygen• Product Configurator on the product page: www.endress.com/cpa875
Technical Information TI01168C
Flowfit CPA240• pH/redox flow assembly for processes with stringent requirements• Product Configurator on the product page: www.endress.com/cpa240
Technical Information TI00179C
Unifit CPA842• Installation assembly for food, biotechnology and pharmaceutics• With EHEDG and 3A certificate• Product Configurator on the product page: www.endress.com/cpa842
Technical Information TI00306C
Cleanfit CPA450• Manual retractable assembly for installing sensors with a diameter of 12 mm and alength of 120 mm in tanks and pipes• Product Configurator on the product page: www.endress.com/cpa450
Technical Information TI00183C
Flowfit CYA21• Universal assembly for analysis systems in industrial utilities• For sensors with Ø 12 mm and length 120 mm• Compact stainless steel assembly with low sampling volume• Product Configurator on the product page: www.endress.com/CYA21
Technical Information TI01441C
CYA680• Flow assembly for hygienic sensors• For sensor installation in pipes• Suitable for cleaning in place (CIP) and sterilization in place (SIP)• Certified biocompatibility as per USP Class VI, FDA-listed seals and hygienic,
electropolished surfaces Ra=0.38 µm (15 µinch)• Product Configurator on the product page: www.endress.com/cya680
Technical Information TI01295C

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Memosens COS81E

Accessories

11.1.2

Measuring cable

Memosens data cable CYK10• For digital sensors with Memosens technology• Product Configurator on the product page: www.endress.com/cyk10
Technical Information TI00118C
Memosens data cable CYK11• Extension cable for digital sensors with Memosens protocol• Product Configurator on the product page: www.endress.com/cyk11
Technical Information TI00118C
Memosens laboratory cable CYK20• For digital sensors with Memosens technology• Product Configurator on the product page: www.endress.com/cyk20

11.1.3Zero-point gel

COY8
Zero-point gel for oxygen and disinfection sensors• Oxygen-free and chlorine-free gel for the verification, zero point calibration andadjustment of oxygen and disinfection measuring points• Product Configurator on the product page: www.endress.com/coy8
Technical Information TI01244C

11.1.4

Transmitter

Liquiline CM44
• Modular multi-channel transmitter for hazardous and non-hazardous areas• Hart®, PROFIBUS, Modbus or EtherNet/IP possible• Order according to product structure
Technical Information TI00444C
Liquiline CM42
• Modular two-wire transmitter for hazardous and non-hazardous areas• Hart®, PROFIBUS or FOUNDATION Fieldbus possible• Order according to product structure
Technical Information TI00381C
Liquiline Mobile CML18• Multiparameter mobile device for laboratory and field• Reliable transmitter with display and app connection• Product Configurator on the product page: www.endress.com/CML18
Operating Instructions BA02002C
Liquiline Compact CM82
• Configurable 1-channel multiparameter transmitter for Memosens sensors• Ex- and non-ex applications possible in all industries• Product Configurator on the product page: www.endress.com/CM82
Technical Information TI01397C

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35

Accessories

Memosens COS81E

Liquiline Compact CM72
• 1-channel single parameter field device for Memosens sensors• Ex- and non-ex applications possible in all industries• Product Configurator on the product page: www.endress.com/CM72
Technical Information TI01409C
Memosens analog converter CYM17• Converter for Memosens sensors• Enables the simple use of digital Memosens sensors in fermentation applications in thelaboratory• Product Configurator on the product page: www.endress.com/cym17
Operating Instructions BA01833C
Memobase Plus CYZ71D• PC software to support laboratory calibration• Visualization and documentation of sensor management• Sensor calibrations stored in database• Product Configurator on the product page: www.endress.com/cyz71d
Technical Information TI00502C

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Memosens COS81E

Measured variable

Technical data

12

Technical data

12.1

Input

Dissolved oxygen [mg/l, µg/l, ppm, ppb or %SAT or hPa]
Oxygen (gaseous) [hPa or %Vol]
Temperature [˚C, ˚F]

Maximum measuring range

Measuring ranges apply for 25 ˚C (77 ˚F) and 1013 hPa (15 psi)
c-shaped

u-shaped

0.004 to 26 mg/l
0.05 to 285 % SAT
0.1 to 600 hPa

0.004 to 30 mg/l
0.05 to 330 % SAT
0.1 to 700 hPa

The sensor has an operational range up to 1000 hPa.
The measured errors indicated are reached in the measuring range, but not over theentire operational range.

12.2

Performance characteristics

Response time

From air to nitrogen at reference operating conditions:• t90 : < 10 s
• t98 : < 20 s

Reference operating
conditions

Reference temperature:
Reference pressure:

Maximum measured
error 1)

±1 % or ±8 µg/l (ppb) of the measured value (the higher value is relevant in each case)Repeatability

25 °C (77 °F)
1013 hPa (15 psi)

LOD (limit of detection)

LOQ (limit of quantification)

4ppb

10ppb

2ppb

12.3

Environment

Ambient temperature
range–5 to +100 ˚C (23 to 212 ˚F)

Storage temperature range-25 to 50 °C (77 to 120 °F)
at 95% relative air humidity, non-condensing

1)

In accordance with IEC 60746-1 at rated operating conditions

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37

Technical data

Degree of protection

Memosens COS81E

IP68
IP69

12.4
Process temperature range

Process

SensorMin. and max. process temperature

COS81E-****1* (EPDM)-10 to +140 °C (15 to 280 °F)

COS81E-****3* (FFKM)

0 to +140 °C (32 to 280 °F)

Permanent process temperature

COS81E-**C*** (c-shaped)

0 to 60 °C (32 to 140 °F)

COS81E-**U*** (u-shaped)

0 to 80 °C (32 to 175 °F)

Process pressure range

0.02 to 13 bar (0 to 190 psi) abs.

Temperature/pressure
ratings

p, abs.
[psi] [bar]
188

13

87

6

-10 0

110

140 T [°C]

14 32

230

284 T [°F]A0045731

Chemical resistance

NOTICE
Halogen-containing solvents, ketones and toluene
Halogen-containing solvents (dichloromethane, chloroform), ketones (e.g. acetone,
pentanone) and toluene have a cross-sensitive effect and result in decreased measured
values or, at worst, in the complete failure of the sensor!
‣ Use the sensor only in media that are free from halogens, ketones and toluene.

CIP compatibility

Yes

Autoclavability

Yes, max. 140 °C (284 °F)

12.5
Design38

Mechanical construction

The sensor's spot cap can have either a c-shaped or u-shaped design.

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Memosens COS81E

Technical data

1

2
A0034733

 13

u-shapedc-shaped

Dimensions

50 (1.97)

120 / 160 / 220 / 320 / 420 (4.7 / 6.3 / 8.7 / 12.6 / 16.5)*

12 - 0.1(0.47)

1
2

Design of spot cap

Pg 13,5

A0043883

 14

Dimensions in mm (inch)

Optional flow assembly CYA21 for sensors with Ø 12 mm (accessories)30(1.18)

160 (6.30)

39 (1.54)

Ø6 (0.24)

28 (1.10)

Ø6 (0.24)
Ø 29 x 1.5 (1.14 x 0.06)
A0043025

 15

Dimensions in mm (inch)

WeightDepending on the design (length)
Example: 0.1 kg (0.20 lbs) for version with 120 mm length

Materials

Parts in contact with medium
Sensor shaft
Process seal
Process seal for Ex versions

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Stainless steel 1.4435 (AISI 316L)
FKM (USP<87>, <88> Class VI and FDA)FKM (not FDA-compliant)
39

Technical data

Memosens COS81E

Seals/O-rings
Spot cap
Spot layer
Process connection

Pg 13.5
Torque max. 3 Nm

Surface roughness

Ra < 0.38 µm

Temperature sensor

Pt1000 (Class A according to DIN IEC 60751)

40

EPDM, FFKM (USP<87>, <88> Class VI and
FDA)
Stainless steel 1.4435 (AISI 316L) or
titanium or Hastelloy
Silicone (USP<87>, <88> Class VI and FDA)

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*71521590*
71521590

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