Installation
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MXD70 Conductivity Setup and
Operating Guide
Installation
Some of these contaminants do not contribute directly to the measured conductivity, e.g. organics,
rust and suspended solids, but may form deposits on the electrode surface. In general these may be
cleaned with the bristle brush provided and a weak detergent solution mixed with scouring powder.
Problems may occur in hard water areas where the gradual formation of scale will reduce the active
area of the electrodes. Simple brush cleaning alone will not remove a hard deposit from the electrode
surface. If scaling is suspected the cell should be removed from the system and treated with a 10%
solution of hydrochloric or formic acid. The presence of bubbles will indicate that scale is being
dissolved. Cleaning is completed when bubbles cease and usually takes 2-3 minutes. The cell must be
thoroughly rinsed to remove all traces of acid before it is replaced in the system.
Note: Follow the supplier’s data sheet when handling acids and dispose of as instructed by your
local authority regulations.
Cells with stainless steel electrodes are generally used in applications where a low conductivity is
combined with a low level of organic contamination and cleaning is rarely necessary. Errors in
measurements can often be traced to faulty connections or incorrect setting on the instruments.
However if contamination is suspected the cell should be removed from the system and cleaned if
necessary.
Handling of the cell electrodes will leave residues of oils and greases which will affect the wetting of
the surfaces, leading to inaccurate readings. After touching the electrodes, wash them with a weak
detergent solution and rinse thoroughly. After rinsing check that the surfaces ‘wet’ properly, that is,
they maintain a complete film of water for approximately 10 seconds.
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