Electrodes (conductive level relays)

Working principle
A level control unit is connected to one or more electrodes and to earth.

This earth can be the wall of a metal container or an additional electrode

(earth electrode). If an electrically conductive fluid in the container comes

into contact with the electrode a control circuit will be closed.

The control circuit can be protected against activation by fluids which are

not at rest by means of a delay period; the circuit uses an alternating current

signal to prevent the electrolytic corrosion of the electrodes and

decomposition of the medium.

Area of application
Suitable for monitoring maximum and minimum limits in most electrically

conductive fluids. Suitable for monitoring the flow in pipes and for registering

low fluid levels in drying apparatus and evaporators.
Suitable for sensing the presence of a conductive fluid on top of or below a

non-conductive fluid (interface measurement) (e.g. the superimposition of oil on water).

Temperature
- 20 ° C to 100 ° C (up to 300 ° C).

Materials
Brass, steel, stainless-steel, titanium, Hastelloy, PTFE, E - CTFE or polypropylene coated

insulated electrodes.

Output
Switched output; one or more channels.

Fitting and Types
Fitting from the top or side. Suspended or multiple electrodes, models are also available

for the foodstuffs industry, and designs for signalling water leaks / security risks in buildings.

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