Kobold APS-Z Manuel utilisateur

Operating Instructions

for

pH/Redox Electrodes

(Combination Electrodes)

Model: APS-Z/APK-Z/ARS-Z

APS-Z/APK-Z/ARS-Z

page 2 APS-Z/APK-Z/ARS-Z K04/1122

We don’t accept warranty and liability claims neither upon this publication nor in

case of improper treatment of the described products.

The document may contain technical inaccuracies and typographical errors. The

content will be revised on a regular basis. These changes will be implemented in

later versions. The described products can be improved and changed at any time

without prior notice.

1. Contents

1.Contents ........................................................................................................ 2

2.Note .............................................................................................................. 3

3.Instrument Inspection .................................................................................... 4

4.Regulation Use ............................................................................................. 4

5.Sensor installation ......................................................................................... 5

6.Calibration and measuring ............................................................................ 6

7.Cleaning ........................................................................................................ 8

8.Maintenance ................................................................................................. 9

9.Service life and warranty ............................................................................. 10

10.Order Codes ............................................................................................... 11

11.Disposal ...................................................................................................... 12

Manufactured and sold by:

Kobold Messring GmbH

Nordring 22-24

D-65719 Hofheim

Tel.: +49(0)6192-2990

Fax: +49(0)6192-23398

E-Mail: [email protected]

Internet: www.kobold.com

APS-Z/APK-Z/ARS-Z

APS-Z/APK-Z/ARS-Z K04/1122 page 3

2. Note

Please read these operating instructions before unpacking and putting the unit into

operation. Follow the instructions precisely as described herein.

The instruction manuals on our website www.kobold.com are always for currently

manufactured version of our products. Due to technical changes, the instruction

manuals available online may not always correspond to the product version you

have purchased. If you need an instruction manual that corresponds to the

purchased product version, you can request it from us free of charge by email

([email protected]) in PDF format, specifying the relevant invoice number and

serial number. If you wish, the operating instructions can also be sent to you by

post in paper form against an applicable postage fee.

The devices are only to be used, maintained and serviced by persons familiar with

these operating instructions and in accordance with local regulations applying to

Health & Safety and prevention of accidents.

When used in machines, the measuring unit should be used only when the

machines fulfil the EC-machine guidelines.

If you encounter difficulties during startup, please do not interfere with the electrode

in any way that is impermissible. By doing so, you could endanger your rights under

the instrument warranty. Please contact your supplier.

 Each electrode is a quality product and is individually tested and packaged.

 Storage should be in a dry room at -5 to +30°C. Because pH and redox

electrodes have limited suitability for storage, we do not recommend storing

them for longer than 6 months.

 All electrodes are provided with a rinsing cap or container for transport and

storage to prevent the sensor elements from drying out.

 The electrode should be kept in a 3mol/l solution of KCl.

 If the electrode has been stored dry for an extended time, however, it must

be conditioned before being used for measurements. For this purpose, the

electrode is immersed in a 3mol/l solution of KCl for about 24 hours.

 The pH-sensitive membrane glass must be handled carefully (no skin

contact, protect against damage, etc.)!

 Make certain that electrical connections and cables are kept clean and dry.

If you send the electrode back, we need a brief description of the fault:

o Electrode cannot be calibrated

o Display is not stable

o Other fault:

APS-Z/APK-Z/ARS-Z

page 4 APS-Z/APK-Z/ARS-Z K04/1122

Electrodes must not be allowed to dry out during use or storage!

Do not keep the electrode in distilled water!

3. Instrument Inspection

Instruments are inspected before shipping and sent out in perfect condition.

Should damage to a device be visible, we recommend a thorough inspection of the

delivery packaging. In case of damage, please inform your parcel service /

forwarding agent immediately, since they are responsible for damages during

transit.

Scope of delivery:

The standard delivery includes:

 pH/Redox Electrodes (Combination Electrodes) model: APS-Z/APK-Z/ARS-Z

4. Regulation Use

Any use of the device, which exceeds the manufacturer’s specification, may

invalidate its warranty. Therefore, any resulting damage is not the responsibility of

the manufacturer. The user assumes all risk for such usage.

APS-Z/APK-Z/ARS-Z

APS-Z/APK-Z/ARS-Z K04/1122 page 5

5. Sensor installation

 Electrodes must be installed vertically. The maximum angle to the vertical

is 80°.

 The internal buffer must cover the inside surface of the membrane glass. Air

bubbles in the membrane chamber must be removed by light shaking of the

electrode in the vertical.

APS-Z/APK-Z/ARS-Z

page 6 APS-Z/APK-Z/ARS-Z K04/1122

6. Calibration and measuring

Always follow the instructions in the manual for the transmitter you are

using as well!

 When a new pH electrode is placed in operation with a measurement

amplifier, a calibration must be performed.

 Typically, a two-point calibration is required for pH electrodes. Two standard

buffer solutions are required (for example pH 7.0 and 4.0). Usually, the

buffer solutions are selected to bracket the later measurement range.

Rinse off the electrode with water between measurements!

First Step

Connect the pH/redox electrode with the transmitter and immerse it in a buffer or

test solution (for example pH 7.0 or 468 mV).

 With manual temperature entry, adjust the temperature of the buffer solution

on the measuring instrument.

 Wait until the display value for the pH/redox (and temperature) has

stabilized. Then adjust the pH/redox value of the first buffer/test solution on

the transmitter.

Rinse off the pH electrode with deionized water and carefully dry it with a soft cloth.

For redox electrodes the calibration is now complete

APS-Z/APK-Z/ARS-Z

APS-Z/APK-Z/ARS-Z K04/1122 page 7

Second step

 Immerse the pH electrode in a second buffer solution (for example pH 4.0

or 10.0) and wait until the display value has stabilized. Then enter the pH

value of the second buffer solution.

 The measuring instrument determines the zero point and slope of the

sensor.

 Rinse off the electrode with deionized water and carefully dry it with a soft

cloth.

 The calibration is complete.

APS-Z/APK-Z/ARS-Z

page 8 APS-Z/APK-Z/ARS-Z K04/1122

7. Cleaning

The membrane glass must never be exposed to aggressive or abrasive cleaning

agents (scouring milk, etc.)!

Cleaning the membrane glass must not result in any scratches!

 Impurities that have accumulated on the surface of the membrane glass and

diaphragm must be removed!

 The electrode must be adequately washed off after every cleaning!

 If careful dabbing with a soft moist cleaning tissue proves unsuccessful,

various chemical cleaning methods can be used depending on the type of

impurity:

Type of accumulation Cleaning agent

Lime and metal hydroxide Diluted hydrochloric acid (1-3%)

coatings

Greases and oils Organic solutions (for example ethanol) or

a solution containing a surfactant

(dishwashing detergent, etc.)

Protein Pepsin in diluted hydrochloric acid

Accumulation Cleaning mixture consisting of

containing sulfides hydrochloric acid and thiourea

Inorganic coatings Hydrochloric acid (0.1 mol/l) or caustic

soda (0.1 mol/l)

APS-Z/APK-Z/ARS-Z

APS-Z/APK-Z/ARS-Z K04/1122 page 9

8. Maintenance

 Under normal conditions (e.g. clean medium, stable, non-extreme pH

values) cleaning is recommended every 14 days with monthly calibration.

 Electrodes are naturally consumed by loss of salt from the reference system,

etc. A drift in measured values after some time is therefore normal

measuring behavior.

 If the measured values drift, the electrode must be cleaned and calibrated!

 Cleaning and calibrating cycles can be adjusted depending on the

application and process parameters.

APS-Z/APK-Z/ARS-Z

page 10 APS-Z/APK-Z/ARS-Z K04/1122

9. Service life and warranty

 All pH and redox electrodes are wear parts. Their operational capability

("service life") depends on care and conditions of usage! Depending on the

application, the time until an electrode must be replaced could vary from a

few days to several years. Because of this, it is not possible to offer a

credible guaranty for a minimum service life.

 If the glass is broken, claims under the warranty are normally not honored.

 If you believe there may be a defect in material or manufacturing, please

contact your supplier.

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