Cleaning
conductivity electrodes
Conductivity meter electrodes normally become coated with impurities. The
degree to which this occurs will depend upon the nature of the samples
being tested, and whether or not the electrode is rinsed with distilled
water and properly stored after each use (Fig 2.7 & 2.8).
Electrode
contamination causes a loss in sensitivity and therefore accuracy. Regular
cleaning will maximize electrode performance and ensure a longer working
life.
Note that
when testing nutrient solutions, both ‘organic’ and ‘inorganic’
contaminations tend to co-occur. It is therefore important to use an
all-purpose cleaner such as Flairform’s ‘Electrode
Cleaner’. Be aware that most cleaners usually only remove inorganic
contaminants (i.e. “salts”).
Storing conductivity electrodes
Store the
electrode in distilled water when not in use (Fig 2.8). This will help
prevent salt build-up which tends to encrust the electrode if left to dry
out.
