Endress+Hauser Memosens COS81D User manual

Products Solutions Services
Operating Instructions
Memosens COS81D
Hygienic, optical sensor for measuring oxygen
0
BA01448C/07/EN/04.20
71488795
2020-03-02

EU Declaration of Conformity Memosens COS81D
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EU Declaration of Conformity

Memosens COS81D Table of contents
Endress+Hauser 3
Table of contents
1 About this document ................ 4
1.1 Warnings ............................ 4
1.2 Symbols .............................. 4
2 Basic safety instructions ............ 5
2.1 Requirements for the personnel ............ 5
2.2 Designated use ........................ 5
2.3 Occupational safety ..................... 5
2.4 Operational safety ...................... 6
2.5 Product safety ......................... 6
3 Device description, function ......... 8
3.1 Optical measuring principle ............... 8
3.2 Sensor design ......................... 9
3.3 Memosens technology ................... 9
3.4 Spot cap ............................ 10
3.5 Stabilization time ...................... 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 ....................... 15
5.1 Installation conditions .................. 15
5.2 Mounting the sensor ................... 16
5.3 Installation examples ................... 17
5.4 Post-installation check .................. 20
6 Electrical connection .............. 21
6.1 Connecting the sensor .................. 21
6.2 Ensuring the degree of protection .......... 21
6.3 Post-connection check .................. 21
7 Calibration and adjustment ........ 22
7.1 Types of calibration .................... 22
7.2 Zero point calibration ................... 22
7.3 Calibration in oxygen with 100% rH ........ 23
7.4 Calculation example for the calibration
value ............................... 23
8 Commissioning .................... 26
9 Troubleshooting .................. 27
10 Maintenance ...................... 28
10.1 Maintenance schedule .................. 28
10.2 Maintenance tasks ..................... 28
10.3 Cleaning exterior of sensor ............... 28
10.4 Cleaning sensor optics .................. 29
10.5 Wear parts and consumables ............. 30
10.6 Checking the measurement function ....... 33
11 Accessories ....................... 34
11.1 Assemblies (selection) .................. 34
11.2 Measuring cable ...................... 35
11.3 Zero-point gel ........................ 35
11.4 Junction box RM ...................... 35
11.5 Transmitter .......................... 35
12 Repair ............................ 37
12.1 Spare parts and consumables ............. 37
12.2 Return .............................. 37
12.3 Disposal ............................ 37
13 Technical data .................... 38
13.1 Input ............................... 38
13.2 Performance characteristics .............. 38
13.3 Environment ......................... 38
13.4 Process ............................. 39
13.5 Mechanical construction ................ 39
14 Appendices ....................... 42
Index .................................. 43

About this document Memosens COS81D
4 Endress+Hauser
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
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

Memosens COS81D Basic safety instructions
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2 Basic safety instructions
2.1 Requirements for the 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 and
aqueous 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 Liquiline transmitter using the CYK10 measuring cable.
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 Occupational 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.

Basic safety instructions Memosens COS81D
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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
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.
2.5.2 Electrical equipment in hazardous areas
ATEX II 1G / IECEx Ex ia IIC T3/T4/T6 Ga
The Memosens inductive sensor cable connection system, consisting of:
• oxygen sensor Oxymax COS81D and
• measuring cable CYK10/CYK20
• A maximum ambient temperature of 90 °C (194 °F) must not be exceeded at the sensor
head.
• The certified Oxymax COS81D oxygen sensor, in conjunction with the CYK10 measuring
cable, may be connected only to certified, intrinsically safe, digital sensor circuits of the
Liquiline M CM42 transmitter. The electrical connection must be made according to the
wiring diagram.
• Oxygen sensors for use in the Ex area have a special conductive O-ring. The electrical
connection of the metallic sensor shaft to the conductive mounting location (such as a
metallic assembly) is via the O-ring.
• You must connect the assembly or the installation location to ground according to the Ex
guidelines.
• The sensors must not be operated under electrostatically critical process conditions.
Avoid strong steam or dust currents that act directly on the connection system.
• Hazardous area versions of digital sensors with Memosens technology are indicated by a
red-orange ring in the plug-in head.
• The maximum permitted cable length between the sensor and transmitter is 100 m
(330 ft).
• Full compliance with regulations for electrical systems in hazardous locations (EN/IEC
60079-14) is mandatory when using the devices and sensors.
CSA C/ US: Class I, Zone 0 AEx ia IIC T6…T4 Ga and IS Class I, Division 1, Groups A, B,
C and D T6…T4
Pay attention to the XA and control drawing for the transmitter used.
The relevant XA with the control drawing is available in the Download Area of the
product page under www.endress.com.

Memosens COS81D Basic safety instructions
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Temperature classes ATEX, IECEx, CSA C/ US and NEPSI
ATEX II 1G Ex ia IIC T3/T4/T6 Ga
Type Medium temperature Ta for temperature class (Tn)
COS81D - BA****13 -10 °C ≤ Ta ≤ 130 °C (T3)
-10 °C ≤ Ta ≤ 120 °C (T4)
-10 °C ≤ Ta ≤ 70 °C (T6)
COS81D - BA****33 0 °C ≤ Ta ≤ 130 °C (T3)
0 °C ≤ Ta ≤ 120 °C (T4)
0 °C ≤ Ta ≤ 70 °C (T6)
IECEx Ex ia IIC T3/T4/T6 Ga
Type Medium temperature Ta for temperature class (Tn)
COS81D - IA****13 -10 °C ≤ Ta ≤ 130 °C (T3)
-10 °C ≤ Ta ≤ 120 °C (T4)
-10 °C ≤ Ta ≤ 70 °C (T6)
COS81D - IA****33 0 °C ≤ Ta ≤ 130 °C (T3)
0 °C ≤ Ta ≤ 120 °C (T4)
0 °C ≤ Ta ≤ 70 °C (T6)
CSA C/ US: Class I, Zone 0 AEx ia IIC T6…T4 Ga and IS Class I, Division 1, Groups A, B, C and
D T6…T4
Type Medium temperature Ta for temperature class (Tn)
COS81D -C3****13 -10 °C ≤ Ta ≤ 120 °C (T4)
-10 °C ≤ Ta ≤ 70 °C (T6)
COS81D - C3****33 0 °C ≤ Ta ≤ 120 °C (T4)
0 °C ≤ Ta ≤ 70 °C (T6)
NEPSI Ex ia IIC T3/T4/T6 Ga
Type Medium temperature Ta for temperature class (Tn)
COS81D - NA****13 -10 °C ≤ Ta ≤ 130 °C (T3)
-10 °C ≤ Ta ≤ 120 °C (T4)
-10 °C ≤ Ta ≤ 70 °C (T6)
COS81D - NA****33 0 °C ≤ Ta ≤ 130 °C (T3)
0 °C ≤ Ta ≤ 120 °C (T4)
0 °C ≤ Ta ≤ 70 °C (T6)

Device description, function Memosens COS81D
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3 Device description, function
3.1 Optical measuring principle
Sensor structure
Oxygen-sensitive molecules (markers) are integrated into the optically active layer
(fluorescence layer).
The fluorescence 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 fluorescence
layer.
Measurement process (principle of 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 fluorescence layer.
1. The sensor optics send orange light pulses to the fluorescence layer.
2. The markers "respond" (fluoresce) with darkred 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 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 sensor provides measured values for temperature and partial pressure as well as a raw
measured value. This value corresponds to the fluorescence 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 measurement 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.
• 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

Memosens COS81D Device description, function
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3.2 Sensor design
1 2 34
67
8 5
A0027181
 1 Memosens COS81D
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 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 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

Device description, function Memosens COS81D
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3.4 Spot cap
The oxygen dissolved in the medium is diffused to the fluorescence 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.
3.5 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.

Memosens COS81D Incoming acceptance and product identification
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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/cos81d
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 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.

Incoming acceptance and product identification Memosens COS81D
12 Endress+Hauser
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.
Manufacturer address
Endress+Hauser Conducta GmbH+Co. KG
Dieselstraße 24
D-70839 Gerlingen
4.3 Scope of delivery
Scope of delivery of sensor
• Oxygen sensor with protection cap
• Brief Operating Instructions
• Certificate
Scope of delivery of the Memosens COV81 maintenance kit is based on the
configuration
• Spot cap
• O-ring mounting tool
• Cleaning cloth for optics
• O-rings
• Certificate
4.4 Certificates and approvals
A list of all the approvals is provided below. The approvals that are valid for this product
depend on the device version ordered.
4.4.1  mark
Declaration of Conformity
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.
4.4.3 Ex approvals
Version COS81D-BA
ATEX II 1G Ex ia IIC T3/T4/T6 Ga
Version COS81D-IA
IECEx Ex ia IIC T3/T4/T6 Ga
Version COS81D-C3
CSA C/ US Class I, Zone 0 AEx ia IIC T6…T4 Ga and IS Class I, Division 1, Groups A, B, C
and D T6…T4
Version COS81D-NA
NEPSI Ex ia IIC T3/T4/T6 Ga

Memosens COS81D Incoming acceptance and product identification
Endress+Hauser 13
4.4.4 Certification body Certification center
DEKRA Testing and Certification GmbH
Bochum
OOO "НАНИО ЦСВЭ"
Russian Federation
4.4.5 Material certificates
Manufacturer declaration of FDA compatibility
All parts (seals) in contact with the medium comply with the relevant regulations of the
U.S. Food and Drug Administration (FDA).
Certified in the FDA Declaration of Conformity and Pharma CoC (→ Product Configurator
on the product page)
Product FDA certificate for
COS81D-*******1 O-rings, process seal, spot layer in contact with medium
Hazardous area versions
For operation in FDA processes, another FDA-approved seal must be installed before
the process seal (for example CPA442). Doing so will sufficiently separate the process
from the Ex connection.
Material test certificate
A test certificate 3.1 in accordance with EN 10204 is supplied depending on the version (→
Product Configurator on the product page).
This certificate certifies the traceability of the materials used including the pipe material.
4.4.6 EHEDG
COS81D-******1* only
Compliance with EHEDG's criteria for hygienic design
• Technical University of Munich, Research Center for Brewing and Food Quality, Freising-
Weihenstephan
• Certificate type: Type EL Class I
The use of an EHEDG-certified assembly is a prerequisite for the easy-to-clean installation
of a 12-mm sensor in accordance with EHEDG requirements. Furthermore, the instructions
regarding the hygienic installation and operation of the assembly in the relevant
Operating Instructions must be adhered to.
4.4.7 ASME BPE
Only COS81D-****C*1*
Designed in accordance with the criteria of ASME (American Society of Mechanical
Engineers) BPE (Bioprocessing Equipment)
Ensure a suitable assembly is used.
4.4.8 Regulation (EC) No. 1935/2004
Meets the requirements of Regulation (EC) No. 1935/2004
The sensor therefore meets the requirements for materials that come into contact with
food.

Incoming acceptance and product identification Memosens COS81D
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4.4.9 Biological reactivity test
Certificate of Compliance for biological reactivity tests as per USP (United States
Pharmacopeia) part<87> and part <88> class VI with batch traceability of materials in
contact with product (O-rings, spot layer in contact with medium).
4.4.10 Marine approvals
A selection of sensors have type approval for marine applications, issued by the following
classification societies: ABS (American Bureau of Shipping), BV (Bureau Veritas), DNV-GL
(Det Norske Veritas-Germanische Lloyd) and LR (Lloyd’s Register). Details of the order
codes of the approved sensors, and the installation and ambient conditions, are provided in
the relevant certificates for marine applications on the product page on the Internet.
4.4.11 CRN approval
As the assembly 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 piping
code"; category F) with a CRN (Canadian Registration Number) in all Canadian provinces.

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5 Installation
5.1 Installation conditions
5.1.1 Orientation
COS81D-****C*** (c-shaped)
135°
225°
45°
315°
0° 180°
A0042948
 3 Installation angle for Memosens COS81D-****C*** (c-shaped spot cap)
The sensor can be installed at any installation angle (0 to 360 °).
Recommended installation angle
COS81D-****U*** (u-shaped)
45°
135°
45°
0° 180°
A0042949
 4 Installation angle for Memosens COS81D-****U*** (u-shaped spot cap)
Recommended installation angle
Possible installation angle
Inadmissible installation angle
The sensor must be installed at an angle of inclination of 0 to 180° in an assembly, holder
or appropriate 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.

Installation Memosens COS81D
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Inclination angles other than those mentioned are not permitted. In order to avoid buildup
and condensation on the spot, do not install the COS81D-****U ***sensor upside down.
Follow the instructions for installing sensors in the Operating Instructions for the
assembly used.
5.1.2 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 COS81D oxygen sensor
• Measuring cable CYK10
• A transmitter, e.g. Liquiline CM42, Liquiline CM44x/R, Liquiline CM44P, Liquiline
Compact CM72/82
• Optional: an assembly, e.g. permanent installation assembly CPA842, flow assembly or
retractable assembly CPA875
1 2
3
4
A0029064
 5 Example of a measuring system with COS81D
1 Retractable assembly CPA875
2 Liquiline CM42 transmitter
3 Measuring cable CYK10
4 Memosens COS81D oxygen sensor

Memosens COS81D Installation
Endress+Hauser 17
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.
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 on to the sensor body 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 (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. You will achieve a
defined immersion depth of the sensor into the medium in the simplest way.
5.3.2 Flow assembly
Flow assembly CYA680
The flow assembly is available in various nominal diameters and materials. It can be
installed both in horizontal and vertical pipes.

Installation Memosens COS81D
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1
2
2
A0042963
 6 Flow assembly CYA680
1 Flow chamber of assembly
2 Installed sensor Memosens COS81D
Flow assembly 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
best suited for residual oxygen measurement in water treatments and boiler feedwater.
The flow comes from below.
1 2
3
4
A0014081
 7 Flow assembly
1 Installed sensor Memosens COS81D
2 Drain
3 Wall mount (clamp D29)
4 Inflow
5.3.3 Retractable assembly (CPA875 or CPA450)
The assembly is designed for installation on tanks and pipes. Suitable nozzles must be
available for this.
Install the assembly in places with uniform flow conditions. The minimum pipe diameter is
DN 80.

Memosens COS81D Installation
Endress+Hauser 19
Installation position for COS81D-****U*** (with u-shaped spot cap)
A
A*
5
3
4
1
2
3
4
2
A0042966
 8 Suitable and unsuitable installation positions for Memosens COS81D 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 COS81D-****C*** (with c-shaped spot cap)
A
A*
5
3
4
1
2
3
4
2
A0042965
 9 Suitable and unsuitable installation positions for Memosens COS81D 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 deposits on the sensor membrane fluorescence cap spot cap.
‣Do not install sensor COS81D-****U (u-shaped) upside down.

Installation Memosens COS81D
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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.