Endress+Hauser Memosens COS51E Bedienungsanleitung

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Operating Instructions

Memosens COS51E

Amperometric oxygen sensor with Memosens 2.0

technology

BA02146C/07/EN/02.22-00

71556090

2022-01-19

Memosens COS51E Table of contents

Endress+Hauser 3

Table of contents

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

1.1 Warnings ............................ 4

1.2 Symbols used .......................... 4

1.3 Supplementary documentation ............. 5

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

2.1 Requirements for the personnel ............ 6

2.2 Intended use .......................... 6

2.3 Workplace safety ....................... 6

2.4 Operational safety ...................... 6

2.5 Product safety ......................... 7

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

3.1 Product design ......................... 8

3.2 Measuring principle ..................... 9

3.3 Potentiostatic three-electrode system ........ 9

3.4 Membrane body ....................... 9

3.5 Polarization ........................... 9

3.6 Memosens technology ................... 9

4 Incoming acceptance and product

identification ..................... 11

4.1 Incoming acceptance ................... 11

4.2 Product identification ................... 11

4.3 Scope of delivery ...................... 12

5 Mounting ......................... 13

5.1 Mounting requirements ................. 13

5.2 Mounting the sensor ................... 14

5.3 Installation examples ................... 16

5.4 Post-mounting check ................... 21

6 Electrical connection .............. 22

6.1 Connecting the sensor .................. 22

6.2 Ensuring the degree of protection .......... 22

6.3 Post-connection check .................. 22

7 Commissioning .................... 23

7.1 Function check ....................... 23

7.2 Sensor polarization and preparation for

calibration/adjustment ................. 23

7.3 Calibration and adjustment .............. 24

8 Diagnostics and troubleshooting ... 28

8.1 Checking the sensor .................... 28

8.2 General troubleshooting ................. 28

9 Maintenance ...................... 30

9.1 Maintenance schedule .................. 30

9.2 Maintenance tasks ..................... 30

10 Repair ............................ 34

10.1 General notes ........................ 34

10.2 Return .............................. 34

10.3 Spare parts and consumables ............. 34

10.4 Checking the measurement function ....... 38

10.5 Disposal ............................ 38

11 Accessories ....................... 39

11.1 Device-specific accessories ............... 39

12 Technical data .................... 42

12.1 Input ............................... 42

12.2 Power supply ......................... 42

12.3 Performance characteristics .............. 42

12.4 Environment ......................... 43

12.5 Process ............................. 43

12.6 Mechanical construction ................ 44

Index .................................. 46

About this document Memosens COS51E

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 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

Do not dispose of products bearing this marking as unsorted municipal

waste. Instead, return them to the manufacturer for disposal under the

applicable conditions.

Memosens COS51E About this document

Endress+Hauser 5

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

• Safety data sheet for the relevant electrolyte solutions

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.

Basic safety instructions Memosens COS51E

6 Endress+Hauser

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 Intended use

The sensor is suitable for continuous measurement of dissolved oxygen in aqueous

solutions.

The sensor is particularly suitable for:

• Measuring, monitoring and regulating the oxygen content in activated sludge basins

• Monitoring the oxygen content in the wastewater treatment plant outlet

• Monitoring, measuring and regulating the oxygen content in public waters and fish

farming water

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.

Memosens COS51E Basic safety instructions

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During operation:

‣If faults cannot be rectified:

products must be taken out of service and protected against unintentional operation.

LCAUTION

Cleaning not switched off during calibration or maintenance activities

Risk of injury due to medium or cleaning agent!

‣If a cleaning system is connected, switch it off before removing a sensor from the

medium.

‣If you need to test the cleaning function while cleaning is in progress, wear protective

clothing, goggles and gloves or take other suitable measures to protect yourself.

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 COS51E

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3 Product description

3.1 Product design

A0046006

 1 Sensor structure

1 Memosens plug-in connection

2 Threaded connection NPT ¾"

3 Threaded connection G1

4 Sensor shaft

5 Protection guard

6 Cathode

7 Membrane

8 Electrolyte

9 Anode

A0046012

 2 Sensor head, sectional drawing

7 Membrane

8 Electrolyte

9 Anode

10 Reference electrode

11 Screw thread for protection guard

12 Sealing ring

13 Screw thread for membrane cap

14 Membrane cap

A0046014

 3 Sensor head, top view

6 Cathode

The sensor consists of the following functional units:

• Sensor shaft

• Sensor head with cathode, anode and reference electrode

• Membrane cap with electrolyte filling

• Protection guard

Please note the following:

• As an alternative to the protection guard, a spray head can be used for immersion

operation with cleaning.

• The membrane cap screwed onto the sensor head contains the electrolyte. The screw

plug seals off the membrane cap from the medium.

• The sensor is ready for use immediately.

Memosens COS51E Product description

Endress+Hauser 9

3.2 Measuring principle

3.2.1 Amperometric measuring principle

During amperometric oxygen measurement, oxygen molecules diffuse through the

membrane and are reduced to hydroxide ions (OH-) at the working electrode. At the

counter-electrode, silver is oxidized to silver ions (Ag+) (this forms a silver halide layer).

The associated release of electrons at the working electrode and absorption of electrons at

the counter-electrode causes a current to flow. Under constant conditions, this current

flow is proportional to the oxygen content of the medium. The current is converted in the

transmitter and indicated on the display as an oxygen concentration in mg/l, µg/l, ppm,

ppb or Vol%, ppmVol, raw value nA, as a saturation index in % SAT or as an oxygen partial

pressure in hPa.

3.3 Potentiostatic three-electrode system

The high-impedance, current-free reference electrode plays an important role. The

formation of the silver bromide or silver chloride layer at the anode causes the electrolyte's

bromide or chloride ions to be depleted. With conventional membrane-covered sensors

with a two-electrode system, this results in increased signal drift.

Not so with the three-electrode system:

The change in the bromide or chloride concentration is recorded by the reference electrode

and an internal regulator circuit keeps the working electrode at a constant potential. The

advantages are a much higher signal accuracy and significantly extended calibration

intervals.

3.4 Membrane body

The oxygen dissolved in the medium is transported to the membrane by the necessary

flow. The membrane is permeable for dissolved gases only. Other substances dissolved in

the liquid phase, e.g. ionic substances, will not penetrate through the membrane.

Therefore, medium conductivity has no impact on the measuring signal.

The sensor is shipped with a membrane body, which can be used for both measuring

ranges. The membrane is pretensioned at the factory and can be used immediately.

Electrolytes are measuring range-specific and cannot be mixed in a single application!

Also pay attention to the safety datasheet of the electrolyte

www.endress.com/downloads.

3.5 Polarization

When the sensor is connected to the transmitter, a fixed voltage is applied between the

working electrode and the counter-electrode. The resulting polarization current can be

identified on the transmitter by a reading that is initially high, but decreases over time.

The reading must be stable before the sensor can be calibrated and a reliable

measurement is possible.

3.6 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 and

for Heartbeat Technology functions.

‣Call up the sensor data via the corresponding DIAG menu.

Product description Memosens COS51E

10 Endress+Hauser

Digital sensors can store measuring system data (among other types of data) in the sensor:

• Manufacturer data

• Serial number

• Order code

• Date of manufacture

• Digital sensor label

• Calibration data of the last eight calibrations including factory calibration with

calibration 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

• Operating data

• Temperature application range

• Date of initial commissioning

• Hours of operation under extreme conditions

• Number of sterilizations and CIP cycles (with hygienic sensors)

All Memosens 2.0 E sensors offer these advantages with the latest Liquiline transmitter

software. All Memosens 2.0 sensors are backward compatible with previous software

versions and offer the usual Memosens benefits of the D generation.

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