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

Memosens COS81E Product description
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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