Xylem WTW DurOx 325 Manuale utente

OPERATING MANUAL

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DurOx 325

DISSOLVED OXYGEN SENSOR

OPERATING MANUAL

DurOx 325

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Printed in Germany.

DurOx 325 Contents

Contents

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1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

4 Measuring / Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.1 Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.2 Measuring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

4.3 Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Maintenance, cleaning, replacement . . . . . . . . . . . . . . . . . 8

5.1 General maintenance notes . . . . . . . . . . . . . . . . . . . . . . . 8

5.2 Outside cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

5.3 Changing the electrolyte and membrane cap . . . . . . . . . . 9

5.4 Cleaning the electrodes . . . . . . . . . . . . . . . . . . . . . . . . . 11

5.5 Checking the sensor for freedom from zero-current . . . . 13

5.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

6 What to do if ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

7 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

8 Wear parts and accessories . . . . . . . . . . . . . . . . . . . . . . . 17

Contents DurOx 325

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DurOx 325 Overview

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1 Overview

Structure

Recommended

fields of

application

On site measurements in rivers, lakes and wastewater

1Connection head

2Shaft housing

3Temperature sensor and auxiliary electrode

4Ventilation area

5Lead counter electrode (anode)

6Insulator

7Gold working electrode (cathode)

8WP-D membrane cap (filled with electrolyte solution)

9Protective hood

Safety instructions DurOx 325

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2 Safety instructions

This operating manual contains special instructions that must be followed

during the operation of the D.O. sensor.

Always keep this operating manual in the vicinity of the sensor.

Special user

qualifications

The membrane cap of the D.O. sensor is filled with a small amount of an

alkaline electrolyte solution. All maintenance work that requires dealing with

the electrolyte solution must only be carried out by persons who know how to

safely deal with chemicals.

General safety

instructions

The individual chapters of this operating manual use safety labels like the one

below to indicate danger:

CAUTION

indicates instructions that must be followed precisely in order to avoid

slight injuries or damage to the instrument or the environment.

3 Commissioning

Scope of delivery D.O. sensor DurOx 325, filled with electrolyte solution and ready to

operate

Calibration and storage vessel, OxiCal®-D

1 exchange membrane cap, WP-D

Electrolyte solution, ELY/G

Cleaning solution, RL/G

Polishing strip, SF 300

Operating manual

Note

The membrane cap that is mounted on the sensor for delivery serves mainly

as a transport protection. Depending on the duration of the transport and

storage period, it may have a shortened operational lifetime. If the measuring

system cannot be calibrated (error message of the instrument), please

proceed according to section REPLACING THE ELECTROLYTE SOLUTION AND

MEMBRANE CAP.

Preparing the

sensor for

measurement

Connect the sensor to the measuring instrument. The sensor is immediately

ready to measure. It is not necessary to polarize the sensor.

DurOx 325 Measuring / Operation

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4 Measuring / Operation

4.1 Calibration

Note

For calibration, please refer to the operating manual of the measuring

instrument.

4.2 Measuring

Note the required minimum depth of immersion and minimum approach flow

(see chapter 7 TECHNICAL DATA).

The minimum flow can be provided in different ways, e. g.:

The flow of the water to be measured is sufficient (aeration tank, water

pipe, stream)

Slowly pull the sensor through the water by hand (lake, container), or

Use a flow aid, e.g. stirrer.

4.3 Storage

Always store the sensor in the calibration and storage vessel at a

temperature in the range 0 ... +50 °C (32 ... 122 °F). Make sure that the

sponge in the calibration and storage vessel is always moist.

Calibration and

storage vessel,

OxiCal®-D

Moisten the sponge:

Pull out the insert (1).

Take out the sponge (2), wet it, then slightly squeeze it out.

Put in the sponge and install the insert in the calibration and storage

vessel again.

Maintenance, cleaning, replacement DurOx 325

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5 Maintenance, cleaning, replacement

5.1 General maintenance notes

For your safety Note the following safety instructions when handling electrolyte and cleaning

solutions:

CAUTION

The ELY/G electrolyte solution and RL-G cleaning solution irritate the

eyes and skin. Note the following points when dealing with these

solutions:

During working activities, always wear suitable protective gloves

and protective goggles/face shield.

If it comes into contact with the skin, rinse thoroughly with water and

immediately change contaminated clothing.

If it comes into contact with the eyes, rinse thoroughly with water

and consult a doctor.

Note the safety datasheets.

CAUTION

Before all maintenance activities, disconnect the sensor from the

instrument.

Note

Information on how to order wear parts and maintenance equipment can be

found in chapter 8 WEAR PARTS AND ACCESSORIES.

5.2 Outside cleaning

Cleaning agents

After cleaning, thoroughly rinse with deionized water and recalibrate if

necessary.

Contamination Cleaning procedure

Lime sediments Immerse in acetic acid for 1 minute (volume

share = 10 %)

Fat/oil Clean with warm water that contains

washing-up liquid

DurOx 325 Maintenance, cleaning, replacement

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5.3 Changing the electrolyte and membrane cap

CAUTION

Before starting to work with the sensor, please note the GENERAL

MAINTENANCE INSTRUCTIONS on page 8.

General

information

WTW delivers the sensor ready to operate (see section 3). The electrolyte

solution and membrane cap must only be replaced if:

a calibration error occurs and the membrane is heavily contaminated

the membrane is damaged

the electrolyte solution is exhausted.

Changing the electrolyte and membrane cap

Unscrew the membrane cap.

Caution: Electrolyte solution!

For disposal of the membrane

head and electrolyte solution,

see section 5.6.

Rinse the sensor head with

deionized water.

Carefully rub and dry the

counter electrode with a lint-

free paper towel.

Immerse the sensor head

including the counter

electrode in RL/G cleaning

solution.

Allow to react for 1 to 3

minutes.

Thoroughly rinse the sensor

head with deionized water.

Water the counter electrode in

deionized water for at least

10 minutes.

RL/G

H O

Maintenance, cleaning, replacement DurOx 325

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Carefully shake off the drops

of water.

Fill a new membrane cap with

ELY/G electrolyte solution.

Remove any air bubbles by

carefully tapping the

membrane head. Additionally,

you can prevent air bubbles

by throwing the first filling

away and refilling the

membrane cap.

Thoroughly rinse the sensor

head with electrolyte solution.

Hold the sensor inclined and

screw on the membrane head

fingertight using a paper

towel. Excess electrolyte

solution is forced out of the

ventilation area.

Check the filling:

Inspect the face surface. No

air bubbles may be present

within the dashed circle. Air

bubbles outside this area do

not interfere.

Note

For measurements under high pressure the filling must be

completely free of air bubbles.

Readiness to measure After approx. 30 to 50 minutes, the sensor is ready for operation.

Subsequently calibrate the sensor.

Note

If you want to measure very low oxygen concentrations (< 0.5 %

saturation), we recommend to let the sensor rest overnight and

then calibrate it.

ELY/G

Ventilation area

points upwards

3 mm

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