The conductive control level relay L-ED 3 with the conductive probes is used to control 3 levels or to keep between 2 points the level of conductive liquids like water, oil, chemical products, etc., in 3 tanks or 3 recipients.

Conductive probes could be supplied under request.

The conductive level indicator L-ED 3 bases its work in the conductivity of the liquids to control. They have 3 level controllers associated with a relay. They can work independently or related.

It is necessary an electrode or a probe for each level and a common electrode. If the tank is conductive, it could be used as the common electrode.

If many relays will be used to control only 1 tank, it would be enough to mount a jumper connection between the common of the probes related to the relays.

If only 1 independent signal, maximum or minimum, should be indicated, it would be enough to connect the reference, a probe and mount a jumper connection of the connections of the probe.

It is simple: the device has to be installed in a DIN rail using the undecal socket. The connection of the probe/s depends on each application and the requested models of the probes.


Approximate measures given in mm.

Technical data

NameLevel control relay
TypeL-ED-3 – ref: 2750-3...
Supply voltage:
2750-3-230230 V AC (50 – 60 Hz)
2750-3-115115 V AC (50 – 60 Hz)
2750-3-02424 V AC (50 – 60 Hz)
Power consumption3.2 VA
Galvanic isolationYes
Max. cable section Ø 1 – 2,5 mm2 of a good insulation cable and normally without shielding. If the cable are connected in parallel, it is recommended the installation of shielded cable and with earth connection. The minimum insulation resistance should be minimum 200 kΩ.
Maximum cable length150 m, without shielding
(depending on cable type and the application)
Relay output AC mod. for loadResistive AC 8 A / 250 V
Resistive DC 0,25 A / 200 V, 8 A / 24 V
Inductive AC 2,5 A / 250 V
Inductive DC 4 A / 24 V
Function statusRelay engaged: red LED
Under voltage: green LED
Ambient temperature-20° C – +50° C
Relative humidity30 % – 85 % HR
ProtectionIP20B according to DIN EN60529
Weight0,47 Kg
Current in probes line4 mA
Voltage in probes line24 V AC
Insulation voltage2.500 V AC
Insulation resistance>104 MΩ
Mechanical life30x106 operations
Sensitivity7 – 100 kΩ
BasePoliamyde 6.6

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