Endress+Hauser Oxymax H COS21 User manual

BA244C/07/en/09.06

71032330

Operating Instructions

Oxymax H COS21

Dissolved oxygen sensor

Safety instructions Oxymax H COS21

2Endress+Hauser

1 Safety instructions

1.1 Designated use

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

Major applications:

• Process control in enzyme production

• Control of culture growth

• Biotechnological production

• Food industry

• General process applications

Any other use than the one described here compromises the safety of persons and the entire

measuring system and is, therefore, not permitted.

The manufacturer is not liable for damage caused by improper or non-designated use.

1.2 Installation, commissioning and operation

Please note the following items:

• Installation, commissioning, operation and maintenance of the measuring system must only

be carried out by trained technical personnel.

The technical personnel must be authorized for the specified activities by the system operator.

• Electrical connection must only be carried out by a certified electrician.

• Technical personnel must have read and understood these Operating Instructions and must

adhere to them.

• Before commissioning the entire measuring point, check all the connections for

correctness. Ensure that electrical cables and hose connections are not damaged.

• Do not operate damaged products and secure them against unintentional

commissioning. Mark the damaged product as being defective.

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

personnel.

• If faults can not be rectified, the products must be taken out of service and secured against

unintentional commissioning.

• Repairs not described in these Operating Instructions may only be carried out at the

manufacturer’s or by the service organisation.

1.3 Operational safety

The sensor has been designed and tested according to the state of the art and left the factory in

perfect functioning order.

Relevant regulations and European standards have been met.

As the user, you are responsible for complying with the following safety conditions:

• Installation instructions

• Local prevailing standards and regulations.

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1.4 Return

If the sensor has to be repaired, please return it cleaned to the sales centre responsible.

Please use the original packaging, if possible.

Please enclose the completed "Declaration of Hazardous Material and De-Contamination" (copy

the second last page of these Operating Instructions) with the packaging and the transportation

documents.

No repair without completed declaration!

1.5 Notes on safety icons and symbols

2 Installation

2.1 Incoming acceptance, transport, storage

• Make sure the packaging is undamaged!

Inform the supplier about damage to the packaging. Keep the damaged packaging until the

matter has been settled.

• Make sure the contents are undamaged!

Inform the supplier about damage to the delivery contents. Keep the damaged products until

the matter has been settled.

• Check that the scope of delivery is complete and agrees with your order and the shipping

documents.

• The packaging material used to store or to transport the product must provide shock

protection and humidity protection. The original packaging offers the best protection. Also,

keep to the approved ambient conditions (see "Technical data").

• If you have any questions, please contact your supplier or your sales center responsible.

Warning!

This symbol alerts you to hazards. They can cause serious damage to the instrument

or to persons if ignored.

Caution!

This symbol alerts you to possible faults which could arise from incorrect operation.

They could cause damage to the instrument if ignored.

!Note!

This symbol indicates important items of information.

Installation Oxymax H COS21

4Endress+Hauser

2.2 Installation conditions

2.2.1 Angle of installation

The sensor must be installed with an angle of inclination of at least 10 ° to the horizontal in an

assembly, support or a suitable process connection. Other angles are not permissible. Do not

install the sensor overhead.

!Note!

Make sure you comply with the instructions for installing sensors. You will find them in the

Operating Instructions for the assembly used.

2.2.2 Mounting location

• Select the installation location so that there is easy access for later calibration.

• Make sure that upright posts and assemblies are secured safely and vibration-free.

• For immersed operation in an activated sludge basin, select an installation location which

produces a typical oxygen concentration.

2.3 Installation instructions

2.3.1 Measuring system

A complete measuring system comprises:

• Oxygen sensor COS21

• Transmitter, e.g. Liquisys M COM223/253 F

• Special measuring cable COK21

• Assembly, e.g. retractable assembly CPA475

a0006654-en

Fig. 1: Permitted installation angle

10° 10° Not permissible!

Not permissible!

Permissible angle of installation

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2.3.2 Installing a measuring point

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

1. Install a retractable or a flow assembly (if used) into the process.

2. Connect the water supply to the rinse connections (if you use an assembly with cleaning

function).

3. Install and connect the oxygen sensor.

"Caution!

•Do not install the sensor suspended from the cable.

• Screw the sensor into the assembly so that the cable is not twisted.

• Avoid exerting excessive tensile force on the cable (e.g. from jerky pulling).

• Select the installation location so that there is easy access for later calibration.

a0006653

Fig. 2: Measuring system (example)

1 Oxygen sensor COS21

2 Retractable assembly CPA475

3 Special measuring cable COK21

4 Transmitter Liquisys M COM253 F

CAL REL

REL1

ALARM

REL2

Wiring Oxymax H COS21

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#Warning!

When using metallic assemblies and installation equipment, comply with national grounding

regulations.

2.4 Post-installation check

• Sensor and cable undamaged?

• Cap undamaged?

• Compliance with permissible sensor installation position?

• Is the sensor installed in an assembly and is not suspended from the cable?

• Avoid moisture by rain by fitting the protective cap to the immersion assembly?

3 Wiring

#Warning!

• The electrical connection must only be carried out by a certified electrician.

• Technical personnel must have read and understood the instructions in this manual and must

adhere to them.

• Ensure that there is no voltage at the power cable before beginning the connection work.

3.1 Connection to Liquisys M COM223/253 F

The electrical connection between the sensor and the transmitter uses the multi-core special

measuring cable COK21.

a0005583-en

Fig. 3: Special measuring cable COK21

GN / YE

Assignment Terminal

External shield

Cathode

Anode

NTC temp. sensor

Active internal shield

(NTC temp. sensor)

Oxymax H COS21 Commissioning

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3.2 Post-connection check

4 Commissioning

4.1 Function check

Before first commissioning, check if:

• the sensor is correctly installed

• the electrical connection is correct.

If using an assembly with automatic cleaning, check the correct water connection at the

assembly rinse connection.

#Warning!

Danger of medium leaking off

Before applying compressed air to an assembly with cleaning facility, make sure the connections

are correctly fitted. Otherwise, the assembly may not be insert into the process.

4.2 Polarization

The sensor was tested in the factory for perfect functionality and is supplied ready for operation.

To prepare for calibration, proceed as follows:

1. Remove the sensor protective cap.

2. Place the externally dry sensor in atmospheric air. The air should be saturated with water

vapour. Therefore, install the sensor as close to the water surface as possible. When

calibrating the sensor membrane, make sure the membrane remains dry. Therefore, avoid

any direct contact with the water surface.

3. Connect the sensor to the transmitter and switch on the transmitter.

Instrument status and specifications Remarks

Are the sensor, assembly, junction box or cable damaged? Visual inspection

Electrical connection Remarks

Are the installed cables strain-relieved and not twisted ?

Is the cable type route completely isolated ? Power cable/weak current cable

Are the power supply and signal cable correctly connected to the

transmitter ?

Use the connection diagram of the transmitter.

Are all the screws terminals properly tightened ? Tighten

Are all the cable entries installed, tightened and sealed ? For cable entries lateral: cable loops downwards

for water to be able to drip off.

Are all the cable entries installed downwards or lateral ?

Maintenance Oxymax H COS21

8Endress+Hauser

4. Switch-on the transmitter.

If you connect the sensor to the transmitter, polarization is automatically performed after

switching on the transmitter.

5. Wait for the polarization time to end.

"Caution!

• When you remove the sensor from the medium, protect the sensor from strong sunlight.

• Make sure you comply with the instructions for commissioning and calibration in the

Operating Instructions of the transmitter.

4.3 Calibration

Calibrate the sensor (air calibration) immediately after the polarization time has elapsed.

The calibration intervals depend heavily on:

• The application and

• The installation position of the sensor.

The following methods help you determine how long the calibration intervals should be:

1. Check the sensor one month after its being put into operation by taking it out of the fluid,

drying it and then measuring the oxygen saturation index at air after 10 minutes.

Decide using the results:

a. Ifthemeasuredvalueisnotat102±2%SAT,youhavetocalibratethesensor.

b. Otherwise, double the length of time to the next inspection.

2. Proceed as per Point 1 after two, four and/or eight months. In this way, you can determine

the optimum calibration interval for your sensor.

!Note!

Be sure to calibrate the sensor at least once a year.

5 Maintenance

Maintenance work must carried out at regular intervals. To ensure that it is carried out, we

recommend you enter the maintenance dates into an operations logbook or in an

operations calendar in advance.

The maintenance cycle primarily depends on the system, the installation conditions and the

medium in which measurement is taking place.

The following activities must be carried out:

• Cleaning the sensor

(In particular when the membrane is soiled)

• Check the measuring function:

1. Remove the sensor from the medium.

Oxymax H COS21 Maintenance

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2. Clean and dry the membrane.

3. After about 10 minutes, measure the oxygen saturation index in air (without

recalibration).

4. The measured value should be near to 102% SAT.

• If necessary, replace a defective membrane or one which cannot be cleaned any more.

• Recalibration.

(if desired or required)

5.1 Cleaning the sensor

To ensure reliable measurement, the sensor must be cleaned at regular intervals. The frequency

and intensity of the cleaning operation depend on the measuring medium.

Clean the sensor:

• before every calibration

• at regular intervals during operation as necessary

• before returning it for repairs.

Depending on the type of soiling, proceed as follows:

"Caution!

After cleaning, rinse the sensor with copious amounts of clean water.

5.2 Regenerating the sensor

5.2.1 Replacing the sealing ring

Replacing the sealing ring is only necessary when it is visibly damaged. For replacement, use only

original sealing rings.

5.2.2 Replacing the electrolyte

#Warning!

Risk of acid burns!

The electrolyte is very caustic. You must follow the appropriate occupational safety regulations.

Always wear protective gloves and goggles with handling electrolytes.

Type of soiling Cleaning

Salt deposits Immerse the sensor in drinking water or in 1-5% hydrochloric acid

for a few minutes. Afterwards, rinse it with copious amounts of water.

Dirt particles on the sensor body

(not cap!)

Clean the sensor body mechanically with water and a suitable brush.

Dirt particles on the membrane cap or the

membrane

Clean with water and a soft sponge.

Maintenance Oxymax H COS21

10 Endress+Hauser

To replace the electrolyte, proceed as follows:

1. Remove the membrane cap.

2. Replace the electrolyte and, if necessary, the membrane cap.

3. Place the membrane cap back on the sensor and screw the cap closed to the stop.

5.2.3 Replacing the membrane cap

Removing the old membrane cap

1. Remove the sensor from the medium.

2. Clean the outside of the sensor.

3. Unscrew the membrane cap.

4. If necessary, clean the cathode or replace the sealing ring if it is damaged.

5. Rinse the electrode holder with drinking water.

Installing the new membrane cap

1. Make sure that there are no dirt particles on the sealing surface.

2. Using the pipette supplied, fill approx. 1.5 ml (0.05 fl.oz.) of electrolyte into the membrane

cap.

3. Hold the sensor body straight and carefully screw the membrane cap onto it until the

stop.

!Note!

After replacing the membrane cap, polarize and recalibrate the sensor. Then insert the sensor

into the medium and check that no alarm is displayed on the transmitter.

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