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Calibration and
measurement:
General rules
Subsequent
calibrations
T 814254
05/2014
Note
Please keep the watering cap. It is required for the electrode to be stored.
Always keep the watering cap clean.
•
Remove any gas bubbles behind the pH membrane by shaking.
•
Connect the electrode to the meter.
•
Calibrate the electrode according to the operating manual of the meter and
observe the following rules while doing so:
•
Avoid the carryover of any solution (sample or buffer solution) from one
measurement to the next by taking the following measures:
− Shortly rinse the calibration and sample beakers with the solution the
beakers are to be fi lled with next.
− Between measurements, rinse the electrode with the solution that fol lows.
Alternatively, you can also rinse the electrode with deionized water and then
carefully dab it dry.
•
To measure it is recommended to immerse the electrode in a vertical or
slightly tilted position.
•
Observe the correct depth of immersion and make sure the contact
between the junction and test sample is thorough. The junction is in the area
of the bottom end of the shaft.
Caution:
The combination electrode should be immersed up to the shaft party only!
•
For measurements in aqueous solutions, provide approximately the same
stirring conditions for measuring as for calibrating.
The frequency of subsequent calibrations depends on the application. Many
meters provide an option where you can enter a calibration interval. After the
calibration interval has expired, the meter will automatically remind you of the
due calibration.
Commissioning, measuring, calibration
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