General Information - Dupla 80292 Mode D'emploi

Warning:
9. The electrode may be dipped for a maximum of up to 1 cm below the vent aperture into the water.
10. The electrode is now ready for use.
Repeating of calibration: Within 14 days of initial use. Then every 6 weeks.
Cleaning: The diaphragm and the glass membrane react sensitively to dirt and algae deposits. A sluggish reaction of the electrode is
then the consequence. We recommend that the electrode be cleaned every 4 – 6 weeks.
1. Use only water and soft cloth to clean the electrode.
2. If the contamination is more severe, place the electrode for approximately two hours into a beaker filled with Dupla cleaning
solution (item no. 80460).
3. After this treatment briefly rinse the electrode down with Dupla Dest.
4. Fill the protective cap with 3 molar KCL solution (item no. 80480) and then place it carefully on the electrode tip.
5. Leave the protective cap on the electrode for at least 4 hours.
6. Calibrate the electrode anew.
7. The electrode is now ready for use again.
Replacement of the KCL solution: If the electrode asymmetry is no longer calibratable, the KCL solution can be replaced. For
this purpose push back the silicone hose on the electrode head, until the opening is exposed. Now, with a Dupla dosing pipette
remove the old KCL solution from the electrode. After complete emptying, fill up the electrode with 3-molar KCL solution up to the
opening. Push the silicone hose over the opening. The electrode is ready for use again after new calibration.
Storage: For preserving the electrode, the protective cap is filled with 3-molar KCL solution and carefully placed on the electrode
tip. Check the electrode regularly every four weeks. The device must only be stored in dry rooms at temperatures between 10 – 30 °C.
The electrode may burst at temperatures below -5 °C due to the inner electrolyte freezing. The electrode must never be stored
in distilled water!

General information:

· pH electrodes are highly sensitive precision devices. For this reason, please treat with the appropriate care and protect the device
from mechanical load. The perfect location for the device in the aquarium is dark and with little water movement. A well-lit
location can result in algae growth on the sensitive glass tip of the electrode. Too strong currents result in fluctuating measuring
values. The cable should not be laid directly together with the current conducting cable as this can cause interferences. Leakage
currents due to defective electrical devices on or in the aquarium result in extreme wear in the electrode and premature failure.
· While the electrode is not in use, it is best stored with 3 molar KCL solution (item no. 80480) in the protective cap. This will
reduce the natural ageing process to an absolute minimum.
· Each pH electrode is subject to a natural ageing process. The expected service life is significantly increased by the option to
replace the reference electrolyte.
· The Dupla pH-Elektrode is a double junction electrode. This electrode does not react as sensitively to environmental
influences as a standard electrode.
· If the electrode reacts with striking slowness during calibration, the electrode must be cleaned.
Important notes:
· Never operate the electrode completely immersed, not even for a short time. The cap must always remain above the
surface of the water! Ensure safe fastening of the electrode.
· Always keep the connection plug dry.
· For extremely precise measurements the calibrating process can be repeated several times.
· Do not use the calibrating solution more than once.
· If the electrode reacts with striking slowness during calibration, the electrode must be cleaned.
· If the electrode has been stored dry for a relatively long time, it must be thoroughly soaked for 24 hours in 3-molar KCL
solution before measurement.
· Reference electrodes with liquid electrolyte should always contain enough liquid. The liquid column inside the electrodes
should reach up a few centimetres higher than the surface of the measuring solution.
· From time to time the filling aperture of the electrode must be freed for the purpose of pressure balancing. That also applies
to the first use.
· Crystallising of the 3-molar potassium chloride solution on the Dupla pH electrode is a natural process and does not
affect its quality in any way. Before first use simply wash under running water.
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