User manual

Z03.0.0X.6C-02 page 2 of 4
Introduction:
All electrodes are delivered checked and ready for measuring. The warranty period is 6 months for appropriate
treating.
pH-electrodes are wearing parts and have to be exchanged when the demanded values are not complying with,
even after thoroughly cleaning the electrode and regenerating it, depending on chemical and mechanical strain.
When using please consider that different substances in aqueous solution may affect glass and that chemicals may
react with the KCL-dilution in the electrode and could block the diaphragm
Examples: - protein-containing dilutions, as used in medicinal and biological measuring, the protein could be de-
natured by the KCl-dilution
- coagulated lacquers
- dilutions containing higher concentration of silver-ions
Other problems could happen when measuring ion-depleted and solvent-containing mediums. The problems occur-
ring measuring these mediums could partly be solved by using our double-chamber electrode with appropriate
bridge-electrolyte (different, depending on use) (type GE 103)
Substances that deposit on the diaphragm, influence the measuring and have to be removed regularly. This can be
done with the help of e.g. automatic-cleaning-facilities.
Different fields of application
1. Measuring ion-depleted mediums (rainwater, aquarium-water, VE-water)
Our Type GE 104 (special-grinding-electrode from 20 µS/cm) or GE 106 (from 25 µS/cm)
2. Seawater-aquarium
Normal pH-single-rod measuring cells with 3 mol/l KCl (type GE 100)
3. Photo-laboratories
Double-chamber-electrode (type GE 103) with bridge-electrolyte. (front chamber 1 mol/l KNO
3
, rear chamber: 3
mol/l KCl). Watering-cap for storing the electrode has to be filled with 1 mol/l KNO
3
.
4. Swimming-pool
Standard pH-electrode with 3 mole/l KCl (type GE 100 or GE104)
5. Ground survey
Glass-electrode with different diaphragms (type GE 101). Use our pre-injection-spike! (our type VD120)
6. Cheese, fruits, meat
Injection-electrode (type GE 101). When measuring cheese, milk and other products containing protein, the
electrode has to be cleaned wit a special cleaning-fluid (pepsin-cleaning agent – e.g. contained in working and
calibration set)
Normal cleaning: Put the electrode for 10 min. in the pepsin-cleaning agent GRL100 (0,1 mole HCl with pepsin)
The lifetime of electrodes is normally at least 8-10 months, when treating and cleaning the electrodes thoroughly it
can be risen up to over 2 years. Exact statements can not be given, because it depends on the relative case of
operation.
When the pH X-Value can not be set, this is a sign that
a) the electrode is exhausted and has to be exchanged or
b) the buffer-dilution has exhausted (prepare new dilution). Prepared buffer-dilutions have a limited life time
(about 1 month) when using/calibrating it thoroughly (no procrastination of buffer-dilution-residua from one dilu-
tion to an other through cleaning and drying the electrode not enough)
Buffer-capsules have no lifetime limitations, therefor we recommend keeping a sufficient number of them in stock.
PH12-buffer-capsules (white) have to be stored in an exsiccator or stored together with drying agent.
The electrolyte (3mol/l KCl) should always be available for refilling, its also recommended to keep enough in stock.