Adjustment - Dupla 80292 Mode D'emploi

• Always keep the connection plug dry.
• For extremely precise measurements the calibrating process can be repeated several times.
• Do not use the calibrating solution several times.
• If the electrode has been stored dry for a relatively long time, it must be thoroughly soaked for 24 hours 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.
• The crystallising out of the 3-molar potassium chloride solution on the Dupla pH electrode basic is a natural process and does not
affect its quality in any way. Before using it for the first time simply wash under running water.
• The electrode must never be used in combination with medication, algae killers or similar chemicals! The electrode must be remo-
ved from the tank for the duration of treatment.
Safety instructions: Technical products must only be operated as supplied. Electronic components must not be modified in any way,
and the leads must not be shortened. Covers or housings must not be opened. The product must not be used if damaged or must be
shut down immediately by pulling the mains plug if damage is detected.

Adjustment

1. Connect the electrode to the appropriate instrumentation and control device.
2. Remove the protective cap from the electrode.
3. Briefly flush the electrode tip with Dupladest.
4. Hold the electrode in the calibration solution pH 7 and adjust the instrumentation and control device to the zero point pH / in
accordance with the adjusting instructions for your device.
5. Then flush the electrode tip again with Dupladest.
6. Now hold the electrode into the calibrating solution with pH 4 and adjust the instrumentation and control device in accordance
with the adjustment instructions of your device to the steepness pH 4.
7. Rinse down the electrode briefly with Dupladest.
8. Now fasten the electrode with the clamps and suckers also supplied at the place of use in the aquarium.
Warning!
9. The electrode may be dipped for a maximum of up to 1 cm before the vent aperture into the water.
10. The electrode is now ready for use.
Repeating of calibration
After initial use by at least 14 days. 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 6 – 8 weeks.
1. Place the electrode for approximately two hours into a beaker filled with Dupla cleaning solution (item no. 80460).
2. After this treatment briefly rinse the electrode down with Dupladest.
3. Fill the protective cap with 3 molar KCL solution and then place it carefully on the electrode tip.
4. Leave the protective cap on the electrode for at least 4 hours.
5. Adjust the electrode to the instrumentation and control device.
6. The electrode is now ready for use again.
Replacement of the reference electrolyte
If the electrode asymmetry is no longer calibratable, the reference electrolyte 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 the old electrolyte can be removed from
the electrode. After complete emptying, fill up the electrode with 3-molar KCL solution as far as 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!