The Ph Combination Electrode; Ph Combination Electrodes For Different Areas Of Application - JUMO 202710/20 Operating Manual

Problem cases

11.1 pH combination electrodes for different areas of application

Area of application
Drinking water monitoring, aquariums, fish
breeding, lake and sea water, etc.
Generally aqueous media, beverage indus-
try, company laboratory, chemistry, etc.
In the food industry for insertion measure-
ments in sausage, meat, cheese, fruit,
pasta products, and other semi-solid food,
soil measurements, small liquid samples,
etc.
Industrial and municipal wastewater, elec-
troplating plants, paint shops, generally
contaminated media, etc.

11 The pH combination electrode

NOTE!
pH combination electrodes are wearing parts that need to be replaced after
chemical and mechanical exposure when the required values can no longer
be obtained, even after thorough cleaning.
When in use, it is important to remember that various substances (for exam-
ple, hydrofluoric acid (HF)) corrode glass in aqueous solutions. Chemicals
can react with the KCl electrolyte in the combination electrode and/or cause
a blockage of the diaphragm
• with solutions containing protein, such as those used for measurements in
the medical and biological sector, KCl can result in the denaturation of the
protein
• coagulated coatings
• solutions that contain relatively high concentrations of silver ions
• ion-deficient solutions (de-ionized or ultra-pure water)
• solutions containing a solvent
If measurements are to be taken in these or similar solutions, we advise deter-
mining the pH value as quickly as possible so as to avoid unnecessary strain
on the combination electrode.
After the measurement, the combination electrode must be cleaned and
stored in either a KCl storage container or with a watering cap.
Substances that are deposited on the measuring membrane or the diaphragm
have an effect on the measurement and must be removed regularly. This can
be done, for example, using an automatic cleaning device.
.
pH combination electrode -
version, type, part no.
Type 201005/65-18-45-2000-76-120/837,
2 m fixed cable connection and BNC connector,
part no. 00417300
Type 201030/76-10-07-40-1000-76-120/000, KCl-
filled, 1 m fixed cable connection and BNC connec-
tor
part no. 00300196
Type 201030/60-15-08-40-1000-76-120/052,
insertion electrode, plastic version,
solid electrolyte gel, 1 m fixed cable connection and
BNC connector,
part no. 00448527
Type 201030/51-18-07-40-2000-76-120/052, 837,
2 m fixed cable connection and BNC connector,
part no. 00532380
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