Level Electrodes
Rod electrodes are used in dosing systems to monitor
and control filling levels.
2-rod electrode
2-rod electrodes are used to monitor a single filling
level. Typical applications include minimum-level shut-off
for centrifugal pumps (MinMin alarm) and overflow protection
for tanks (MaxMax alarm).
3-rod electrode
The filing height can be adjusted between two levels
with the aid of 3-rod electrodes. Typical applications
include control of the level in a receiving tank using
a solenoid valve or transfer pump.
Service conditions
Rod electrodes are dependent on the conductivity of
the liquid. They cannot be used in non-conductive liquids
(<10 µS/cm).
Rod electrodes similarly cannot be used if the gaseous
phase above the liquid has the same electrical conductivity
as the liquid itself. When used in moving liquids, e.g.
liquids with agitator, the metal rods must be secured
to the tank wall in order to prevent being entrained
by the flow of liquid.
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