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

Conductive probes could be supplied under request, as well as the undecal socket for the mounting in a DIN rail.

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

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 only an independent signal should be indicated, it would be enough to place a probe in the desired point, as well as the common and a jumper connection must be mounted between the terminals (5) and (6).

The DC L-EDs (24 V DC and 12 V DC), are manufactured with a built-in selector. Changing this selector position, allows to choose the operation mode between filling and emptying, without modifying the relay output’s connections.

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 – ref: 2750-1...
Supply voltage:
2750-1-230230 V AC (50 – 60 Hz)
2750-1-115115 V AC (50 – 60 Hz)
2750-1-02424 V AC (50 – 60 Hz)
2750-1-024-DC24 V DC
2750-1-012-DC12 V DC
Power consumption:
AC models1,7 W
DC models1,2 W
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.
Max. cable length(depending on cable type and the application)
AC models150 m, without shielding
DC models100 m, without shielding
Relay output AC mod. for loadResistive AC 8 A / 250 V
Resistive DC 0,4 A / 200 V, 10 A / 24 V
Inductive AC 5 A / 250 V
Inductive DC 5 A / 24 V
Relay output DC mod. for loadResistive AC 10 A / 250 V
Resistive DC 0,4 A / 200 V, 8 A / 24 V
Inductive AC 5 A / 250 V
Inductive DC 5 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
Weight0,18 Kg
Current in probes line
AC models4 mA
DC models3,2 mA
Voltage in probes line
AC models24 V AC
DC models6,2 V AC
Insulation voltage2.500 V AC
Insulation resistance>104 MΩ
Mechanical life30x106 operations
AC models7 – 100 kΩ
DC models8 – 45 kΩ
LED visorLexan

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