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12.1 General handling
Recommended redox combination electrodes
Operating life
12 The redox combination electrode
CAUTION!
The manual measuring device is designed for using electrodes with the Ag/
ACl (silver/silver chloride) reference system.
If using other types, the measuring function mV
ment results.
Combination electrodes should be stored in a dry place at a temperature
between 10 °C and 30 °C. Below 0 °C, the combination electrode can be
destroyed due to freezing of the electrolyte!
The sensor part of the combination electrode should be protected against dry-
ing out by using a protective cap filled with 3 molar KCl solution or a storage
holder. Lengthy storage in de-ionized (distilled) water will result in a depletion
of the KCl within the combination electrode.
Filling up the electrolyte is not required or possible with these combination
electrodes (low-maintenance).
Before measuring and after every measurement in different media, the combi-
nation electrode must be carefully rinsed with de-ionized (distilled) water.
Clean the combination electrode after use. For pollutants containing protein,
pepsin hydrochloric acid solution (part no. 00307114) is recommended.
The platinum tip of the sensor can be cleaned with ordinary scouring powder
(rinse well afterward).
If the combination electrode malfunctions:
• Function test with a second reference combination electrode
• Replace combination electrode
Solutions for calibration, cleaning, and activation can be obtained from labora-
tory suppliers.
Reference system: Ag/AgCl, electrolyte: KCl, 3 mol/l
Type: 201010/65-22-65-2000-76-120/837, 2 m fixed cable connection
and BNC connector
Part no. 00424950
Use only this type when converting to hydrogen system "mV
surements!
The operating life of combination electrodes depends on the operating condi-
tions. Under normal conditions and with appropriate maintenance, the operat-
ing life is at least 6 months.
will yield incorrect measure-
H
" and rH mea-
H
51
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