Xylem IOLINE TRIS COMPATIBLE pH ELECTRODES Manuel d'utilisateur télécharger pdf

Instruction manual for

SCHOTT

Instruments

IoLine electrode series

Preparation and general

The electrodes of the IoLine series except the micro versions

(IL-MICRO-XXX) are delivered in a special watering vessel

with a bayonet lock. This vessel can also be used as storage

equipment between measurements. Micro electrodes are

delivered in a screwable glass tubing, due to their smaller

diameter

Before you pull out the electrode of the watering vessel with

the bayonet lock the lock must be unscrewed by turning

anticlockwise with line of sight on top of the electrode head.

Then the seal is released and the electrode is loosened. The

vessel contains watering solution L911. This solution

conditions the glass membrane and causes a faster response.

Therefore the vessel should be refilled with L911, alternatively

L300 (3 mol/l potassium chloride solution) can be used. In the

electrolyte chamber (chamber 3 in the sectional drawing) is

filled potassium chloride solution 3 mol/l. The filling level must

be at least as high as the inner diaphragm and the electrolyte

level should be 5 cm above the measured solution. This

electrolyte can be changed if required according sample. For a

stable measurement the conductivity of the solution should be

at least 10 mS/cm. The bridge electrolyte must be free of

silver ions.

The colored iodine containing solutions are incorporated in a

closed system and do not need to be refilled or changed.

For calibration and measurement the refill port slider in the

head of the electrode must be opened, to assure the flow of

electrolyte and stable and fast recording of the signal. The

diaphragm must immerse in the solution.

Measuring the pH-value

Please also note the usage instructions of the measuring

device during calibration and measurement. In order to

minimize inaccuracies in the measurement results, electrodes

used under extreme conditions or at the limits of the specified

usage range should be calibrated more frequently. For

accurate calibration, we recommend the use of our steam

sterilized, certified buffer ampoules to DIN 19 266.

Always use fresh buffer solution.

Storage and maintenance

Electrodes should be stored at a temperature of between 0 and

40 °C. Depending on storage conditions (temperature and air

humidity), the irrigation fluid in the cap may dry out

prematurely.

In this case, the electrode must be irrigated for at least 24

hours in L911 or 3 mol/l potassium chloride solution before it is

ready for use. Crystals in the electrolyte area can be dissolved

by warming in a water bath. The electrolyte solution should

then be replaced, and the correct potassium chloride

concentration checked.

Cleaning

Dirt and contamination at the pH-membrane and diaphragm

will lead to measurement inaccuracies.

• The glass membrane can be cleaned by rubbing off with a

fluff-free cloth soaked in ethanol.

• Coatings and deposits can be removed with diluted

mineral acids (e.g. hydrochloric acid 1 : 1).

• Organic contamination with the aid of suitable solvents.

• Grease can be removed with tenside solutions.

• Proteins can be removed with hydrochloric pepsine solution

(cleaning solurion L 510).

• After cleaning, rinse off the electrodes with distilled water, do

not rub dry.

• Ceramic diaphragms blocked from outside can be restored

to working order by carefully rubbing down with fine

sandpaper or a diamond file. Take care not to scratch the

pH glass membrane!

• Platinum diaphragms must not be subjected to any

mechanical treatment. Rinsing (e.g. vacuuming) may be

followed by chemical cleaning (e.g. with dilluted hydrochloric

acid).

• After cleaning, rinse off the electrodes with distilled water, do

not rub dry.

Quality

Every electrode must meet the strict quality requirements of

final testing. The durability depends mainly on the usage

conditions. Extreme conditions include for example high or

frequently fluctuating temperatures, strong acids and caustic

solutions and heavily contaminated solutions attack electrodes.

Hydrofluoric acid, sodium hydroxide and hot phosphoric acid

corrode glass.

Further Information

Further information can be found in the Laboratory catalogue

and in the Process electrodes catalogue of SI Analytics GmbH

or you will find more tips in the operating instruction of your

meter.

Subject to technical amendment.

GA_IoLine_d_us_T814147_111123

SI Analytics GmbH

Hattenbergstrasse 10

55122 Mainz

Germany

Phone +49 (0) 6131/66 5116

Fax +49 (0) 6131/66 5001

E-Mail: support@si-analytics.com

www.si-analytics.com

bridge electrolyte

chamber 3

head with integrated

refill hole

Internal

diaphragm

picture of an

exemplary electrode

sectional drawing

Also with integrated temperature sensor

diaphragm

Internal buffer

pH glass

membrane

derivation element

reference electrolyte

chamber 2

refill port slider

staorage reservoir

for refernece

electrolyte

chamber 1

temperature sensor

reference element

1 2

Résumé du contenu

Page 1

Instruction manual for SCHOTT® Instruments IoLine electrode series Preparation and general The electrodes of the IoLine series except the mi

Page 2 - IoLine-Elektroden Serie

SI Analytics GmbH Hattenbergstrasse 10 55122 Mainz Germany Telefon +49 (0) 6131/66 5116 Telefax +49 (0) 6131/66 5001 E-Mail: [email protected]

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