Wtw Stirrox G Bedienungsanleitung

OPERATING MANUAL

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StirrOx G

DISSOLVED OXYGEN SENSOR WITH INTEGRATED STIRRER

OPERATING MANUAL

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StirrOx G

Printed in Germany.

StirrOx G Contents

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StirrOx G - Contents

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

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

5.1 General maintenance instructions . . . . . . . . . . . . . . . . . . . . . . . 8

5.2 Outside cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

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

5.4 Cleaning the electrodes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

5.5 Checking the sensor for freedom from zero-current . . . . . . . . 14

5.6 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

6 What to do if .... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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

8 Wear parts and accessories. . . . . . . . . . . . . . . . . . . . . . . . . 19

Contents StirrOx G

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StirrOx G Overview

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1 Overview

Structure

Recommended

application range

BOD measurements in BOD sample bottles.

1Shaft housing

2Connection head

3On/Off key for stirrer

4Cable screw joint

5Stirring paddle

6WP-ST membrane cap (filled with electrolyte solution)

7Gold working electrode (cathode)

8Insulator

9Lead counter electrode (anode)

10 Ventilation area

11 Temperature sensor and auxiliary electrode

Safety instructions StirrOx G

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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 StirrOx G, filled with electrolyte solution and ready to operate

Calibration and storage vessel, OxiCal®-ST

ZBK-ST accessory kit, comprising:

– 3 exchange membrane caps, WP-ST

– Electrolyte solution, ELY/G

– Cleaning solution, RL/G

– Polishing strip, SF 300

Operating manual

Getting the sensor

ready for

measuring

Connect the 8-pin plug to the Oxi input and the 2-pin plug to the stirrer

connection of the meter (see operating manual of the meter). The sensor is

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

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 oper-

ational 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.

StirrOx G Measuring / Operation

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4 Measuring / Operation

4.1 Calibration

4.2 Measuring

Depth of

immersion

Observe the minimum and maximum depth of immersion of the sensor. The

temperature sensor / auxiliary electrode must be completely submersed for

measurement.

CAUTION

The sensor is designed for immersion measurements in BOD bottles.

Do not expose the sensor to overpressure (see chapter 7 TECHNICAL

DATA), e.g. due to sealed installation in a pressurized vessel. Danger of

damage to the sensor.

Use of the

integrated

stirrer

The sensor is equipped with an integrated stirring system for the incident flow

of the membrane.

Pressing the On/Off key switches the stirrer on. Pressing once more switches

the stirrer off again.

Measurement in

sample bottles

The displacement volume of the StirrOx G (5,6 ml) is dimensioned so that the

sample bottle is closed free of air bubbles after inserting the sealing plug. If

you use bottles other than the Karlsruhe bottles available at WTW (see

chapter 8 WEAR PARTS AND ACCESSORIES), use WHEATON bottles or bottles

with NS 19 standard ground joint only. The plug should have a displacement

volume of 5.6 to 8.6 ml.

For calibration, please refer to the operating manual of the mea-

suring instrument.

Min. approx. 49 mm

Max. 83 mm

Depth of immersion

Maintenance, cleaning, replacement StirrOx G

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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®-ST

Moisten the sponge:

Screw out the insert (1).

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

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

vessel again.

Sta-ST stand The Sta-ST stand (see chapter 8 WEAR PARTS AND ACCESSORIES) enables

you to place the calibration and storage vessel with the sensor in an upright,

tilt resistant position on a table.

5 Maintenance, cleaning, replacement

5.1 General maintenance instructions

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 the solutions come into contact with the skin, rinse thoroughly with

water and immediately change contaminated clothing.

After each measurement series (before storing the sensor) clean

the sensor (exterior cleaning).

StirrOx G Maintenance, cleaning, replacement

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If the solutions come into contact with the eyes, rinse thoroughly

with water and consult a doctor.

Follow the safety datasheet.

CAUTION

Before all maintenance activities, disconnect the sensor from the

instrument.

Removable stirring

paddle

The stirring paddle can be pulled off for maintenance purposes. After

finishing the maintenance activities reinsert the stirring paddle into the

receptacle as far as it will go. Then turn the stirring paddle so that the paddle

face is positioned in center under the membrane cap.

5.2 Outside cleaning

Cleaning agents

After cleaning, thoroughly rinse with deionized water and recalibrate if

necessary.

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.

in case of a leak message by the measuring instrument

Information on how to order wear parts and maintenance equip-

ment can be found in chapter 8 WEAR PARTS AND ACCESSORIES.

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

Maintenance, cleaning, replacement StirrOx G

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Changing the electrolyte and membrane cap

Pull off the stirring paddle and

screw off the membrane

head.

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

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