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 Conductivity
Value
The conductivity value is a measure for the concentration of
all ions in a liquid. Thus the specific resistance and concentration
of salts, lyes or acids can also be determined.
Measurement
of the conductivity value:
There are two measuring methods which are generally accepted.
Dependent on the application, the inductive or conductive measurement
principle can be chosen.
Conductive
principle:
Between two opposite electrode surfaces, a voltage is applied.
The measuring transmitter converts the arising potential difference
by means of compensation equations into conductivity, concentration
or specific resistance.
Inductive
principle:
The liquid is flown through two coils potted in synthetic material
(e.g. PEEK). Due to the ions in the liquid, the excitation coil
induces a current in the receiver coil. The measuring transmitter
can convert this current by means of compensation equations
into conductivity, concentration or specific resistance.
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