Endress+Hauser Oxymax COS22 Series Bedienungsanleitung

Products Solutions Services

Operating Instructions

Oxymax COS22

Analog sensor for the measurement of dissolved oxygen

BA00446C/07/EN/04.15

71306871

Table of contents

2 Endress+Hauser

Table of contents

1 Document information .............. 3

1.1 Warnings ............................ 3

1.2 Symbols .............................. 3

2 Basic safety instructions ............ 4

2.1 Requirements for personnel ............... 4

2.2 Designated use ........................ 4

2.3 Occupational safety ..................... 4

2.4 Operational safety ...................... 5

2.5 Product safety ......................... 5

3 Device description, function ......... 6

3.1 Amperometric measuring principle .......... 6

3.2 Sensor design ......................... 6

3.3 Membrane body ....................... 6

3.4 Polarization ........................... 6

4 Incoming acceptance and product

identification ....................... 7

4.1 Incoming acceptance .................... 7

4.2 Product identification .................... 7

4.3 Scope of delivery ....................... 8

4.4 Certificates and approvals ................ 8

5 Installation ........................ 9

5.1 Installation conditions ................... 9

5.2 Mounting the sensor ................... 10

5.3 Installation examples ................... 11

5.4 Post-installation check .................. 13

6 Electrical connection .............. 14

6.1 Connecting the sensor .................. 14

6.2 Ensuring the degree of protection .......... 14

6.3 Post-connection check .................. 14

7 Calibration and adjustment ........ 16

7.1 Types of calibration .................... 16

7.2 Calibration in air ...................... 16

7.3 Calculation example for the calibration

value ............................... 17

7.4 Zero point calibration ................... 18

8 Commissioning .................... 19

8.1 Function check ....................... 19

8.2 Sensor polarization .................... 19

8.3 Sensor calibration ..................... 20

9 Troubleshooting .................. 21

10 Maintenance ...................... 22

10.1 Maintenance schedule .................. 22

10.2 Maintenance tasks ..................... 22

10.3 Clean sensor ......................... 23

10.4 Wear parts and consumables ............. 23

11 Accessories ....................... 26

11.1 Assemblies (selection) .................. 26

11.2 Measuring cable ...................... 26

11.3 Zero-point gel ........................ 26

11.4 Maintenance kit ...................... 27

12 Repair ............................ 28

12.1 Spare parts and consumables ............. 28

12.2 Return .............................. 28

12.3 Disposal ............................ 28

13 Technical data .................... 29

Index .................................. 34

Oxymax COS22 Document information

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1 Document information

1.1 Warnings

Structure of information Meaning

LDANGER

Causes (/consequences)

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)

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)

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

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

Basic safety instructions Oxymax COS22

4 Endress+Hauser

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.

• Measuring point faults may be repaired only by authorized and specially trained

personnel.

Repairs not described in the Operating Instructions provided may only be carried out

directly by the manufacturer or by the service organization.

2.2 Designated use

The oxygen sensor is suitable for continuous measurement of dissolved oxygen in water.

The specific suitability depends on the sensor design:

• COS22-*1 (standard, measuring range 0.01 to 60 mg/l)

– Measuring, monitoring and regulating the oxygen content in fermenters

– Monitoring the oxygen content in biotechnology facilities

• COS22-*3 (trace measurement, measuring range 0.001 to 10 mg/l, preferred

operational range 0.001 to 2 mg/l), also suitable for high CO2 partial pressure

– Monitoring inertization equipment in the food industry

– Monitoring the residual oxygen content in carbonated fluids of the beverage industry

– Trace measurement in industrial applications such as inertizations

– Monitoring the residual oxygen content in boiler feedwater

– Monitoring, measuring and regulating the oxygen content in chemical processes

NOTICE

Molecular hydrogen

Hydrogen causes sensitivity in other substances and leads to false low readings or, at the

worst, total failure of the sensor.

‣Only use the COS22-*1/3 sensor in media free of hydrogen.

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 European standards for industrial applications.

• The electromagnetic compatibility indicated applies only to a product that has been

connected in accordance with these Operating Instructions.

Oxymax COS22 Basic safety instructions

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2.4 Operational safety

1. Before commissioning the entire measuring point, verify that all connections are

correct. Ensure that electrical cables and hose connections are undamaged.

2. Do not operate damaged products, and safeguard them to ensure that they are not

operated inadvertently. Label the damaged product as defective.

3. If faults cannot be rectified:

Take the products out of operation and safeguard them to ensure that they are not

operated inadvertently.

2.5 Product safety

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

European standards have been observed.

Device description, function Oxymax COS22

6 Endress+Hauser

3 Device description, function

3.1 Amperometric measuring principle

The oxygen molecules that diffuse through the membrane are reduced at the cathode to

hydroxide ions (OH-). At the anode, silver is oxidized to silver ions (Ag+) (this forms a

silver halide layer). A current flows due to the electron donation at the cathode and the

electron acceptance at the anode. Under constant conditions, this flow is proportional to

the oxygen content of the medium. This current is converted in the transmitter and

indicated on the display as an oxygen concentration in mg/l, µg/l, ppm, ppb or Vol%, as a

saturation index in % SAT or as an oxygen partial pressure in hPa.

3.2 Sensor design

1 2 345

A0011868

 1 COS22

Plug-in head

Thrust collar

Sensor shaft

O-ring 8.5 x 1.5 mm

Membrane body

Shaft sleeve

Glass portion with anode and cathode

Process seal 10.77 x 2.62 mm

Process connection Pg 13.5

3.3 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 standard membrane body, which can be used for all common

applications. The membrane is pretensioned at the factory and can be installed

immediately.

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

3.4 Polarization

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

cathode and anode. The polarization current this creates can be identified on the

transmitter with a display that is initially high, but decreases with time. The sensor cannot

be calibrated until the display is calibrated.

Reference value for nearly complete polarization of a sensor that was previously stored for

a long time:

• COS22-*1: 2 hours

• COS22-*3: 12 hours

After this time, even measurements close to the determination limit are useful. The

necessary polarization time is reduced for sensors that were in use a short time before.

Oxymax COS22 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 your supplier of any damage to the packaging.

Keep the damaged packaging until the matter has been settled.

2. Verify that the contents are undamaged.

 Notify your supplier of any damage to the delivery contents.

Keep the damaged products until the matter has been settled.

3. Check the delivery for completeness.

 Check it against the delivery papers and 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.

The permitted ambient conditions must be observed (see "Technical data").

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

Compare the data on the nameplate with your order.

4.2.2 Product identification

Product page

www.endress.com/cos22

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 the product page for your product on the Internet.

2. In the navigation area on the right-hand side, select "Check your device features"

under "Device support".

 An additional window opens.

3. Enter the order code from the nameplate into the search field.

 You will receive information on each feature (selected option) of the order code.

Incoming acceptance and product identification Oxymax COS22

8 Endress+Hauser

4.3 Scope of delivery

The scope of delivery comprises:

• Oxygen sensor with watering cap (filled with tap water) for protecting the membrane

• Electrolyte, 1 bottle, 10 ml (0.34 fl.oz.)

• Tool to push out the membrane body

• Brief Operating Instructions

4.4 Certificates and approvals

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 EC directives. The manufacturer confirms

successful testing of the product by affixing to it the  mark.

4.4.2 Material certificates

Manufacturer declaration of FDA compatibility

The manufacturer declares the use of FDA-listed materials.

Ask your Sales Center for the certificates.

Product FDA certificate for

COS22-****22 Membrane, O-rings, process seal

COS22Z-*2*2 Membrane, O-rings, process seal

COS22-****23 Membrane, O-rings

COS22Z-*2*3 Membrane, O-rings

Material test certificate

A test certificate 3.1 in accordance with EN10204 is supplied depending on the version (→

Product Configurator on the product page).

EHEDG

Compliance with EHEDG's criteria for hygienic design

• TÜV Rheinland, Apeldorn, Netherlands

• Certificate type: Type EL Class I

Oxymax COS22 Installation

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5 Installation

5.1 Installation conditions

5.1.1 Orientation

10° 10° Not permissible!

Not permissible!

Permissible angle of installation

A0005584-EN

 2 Permitted orientations

The sensor must be installed at an angle of inclination of 10 to 170 ° in an assembly,

bracket or appropriate process connection. Recommended angle: 45°, to prevent the

formation of air bubbles.

Inclination angles other than those mentioned are not permitted. Do not install the sensor

overhead.

Observe the instructions for installing sensors in the Operating Instructions for the

assembly used.

5.1.2 Mounting location

• Choose a mounting location that can be easily accessed at a later stage.

• Ensure that upright posts and fittings are fully secured and vibration-free.

• Select an installation location which produces a typical oxygen concentration for the

individual application.

Installation Oxymax COS22

10 Endress+Hauser

5.2 Mounting the sensor

5.2.1 Measuring system

A complete measuring system comprises:

• An Oxymax COS22 oxygen sensor

• A transmitter, e.g. Liquisys COM2x3

• Measuring cable COK21

• Optional: an assembly, e.g. permanent installation assembly CPA442, flow assembly

CPA240, or retractable assembly CPA875

1 2

A0024029

 3 Example of a measuring system with COS22-*1

1 Retractable assembly CPA875

2 Transmitter Liquisys COM253

3 Measuring cable COK21

4 Oxygen sensor COS22

5.2.2 Installing a measuring point

Installation in suitable assembly is required (depending on the application)

LWARNING

Electrical voltage

In the event of a fault, non-grounded metallic assemblies may be under voltage and then

are not touchable.

‣When using metallic assemblies and installation equipment, observe the national

grounding provisions.

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