12
5. Operation
5.4. Calibrating the redox electrode
Important note: Before turning on the instrument, check that the Redox
electrode is connected.
Redox electrodes do not have a significant drift of the potential, which
is why they are typically not calibrated. However, some deviations of
potential may occur after continued use of the electrode as a result of
changes to the metal surface or contamination of the reference elec-
trode.
5.4.1. Preparation
1. Fill the tube with the 200 mV standard solution (note the fill level).
2. Unscrew the electrode protector containing the electrolyte and rinse
the electrode with deionized water.
3. Screw the electrode on to the tube containing the standard.
5.4.2. Calibration
Stir gently holding the sensor by the handle. Do not hold it by the tube to
avoid heating of the standard solution.
Follow the diagram.
Notes: If the measuring instrument is not used for 5 minutes, it shuts off
automatically.
If errors occur during calibration, an error message will appear on the
display screen (see pg. 19).
During redox calibration, the temperature of the standard must be manu-
ally entered (by pressing
during the process).
2 3
Screw the
electrode
to the
standard
tube.
1
sensION+ PH1_HACH_0710.indd ANG:12sensION+ PH1_HACH_0710.indd ANG:12 7/9/10 13:09:037/9/10 13:09:03
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