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When measuring has to be done in mg/l, the "mg/l" button has to be pushed.
4. Adjust to 0% of 0mg/l with adjustment screw "Z" at the side of the instrument.
5. Clean the electrode with distilled water and make it dry.
For calibration of 100% or the maximum value of mg/l we need distilled water completely saturated
with air. To realise this hang an aquarium pump in 1 litre distilled water and keep it blowing air into
the water for ±20 minutes.
1. Clean the electrode with distilled water and make it dry.
2. Place the electrode in the with air saturated distilled water and stir carefully (±0,5m/s, magnetic
stir).
3. Check if the temperature is stable by keeping the "°C" button pushed.
4. When the instrument has to be calibrated in mg/l, Check the air pressure on a barometer and find
the corresponding value in the table on page 10 at the actual temperature.
5. Wait until the value is stable and adjust at 100% or the maximum value of mg/l from the table with
the adjustment screw "S" at the side of the instrument.
6. When the instrument is calibrated on "%" it is not possible to measure in mg/l.
Then the instrument has to be calibrated in mg/l.
7. Dry the electrode.
ALWAYS STORE THE INSTRUMENT AT A DRY PLACE!!!
2.4 Replacement of the membrane.
When the readout is not stable and accurate anymore the membrane in the electrode has to be
replaced. See also the drawings on page 9.
1. Remove quard cap from the electrode and let the electrolyte flew out of the electrode.
2. Remove cover cap.
3. Remove the membrane and clean the electrode parts.
4. Place the membrane over the top of the cover cap and press tight the guard cap.
5. Trim excessive membrane.
6. Fill electrolyte into the cover cap. Then twist the cover cap back on to the probe.
7. Calibrate the instrument again.
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