L-ED

Conductive level indicators
Control of liquids

Intended use

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.

Function

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.

Mechanical connection

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.

Dimensions

Approximate measures given in mm.

Technical data


Name	Level control relay
Type	L-ED – ref: 2750-1...
Supply voltage:
2750-1-230	230 V AC (50 – 60 Hz)
2750-1-115	115 V AC (50 – 60 Hz)
2750-1-024	24 V AC (50 – 60 Hz)
2750-1-024-DC	24 V DC
2750-1-012-DC	12 V DC
Power consumption:
AC models	1,7 W
DC models	1,2 W
Galvanic isolation	Yes
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 models	150 m, without shielding
DC models	100 m, without shielding
Relay output AC mod. for load	Resistive AC 8 A / 250 V Resistive DC 0,4 A / 200 V, 8 A / 24 V Inductive AC 2,5 A / 250 V Inductive DC 2,5 A / 24 V
Relay output DC mod. for load	Resistive 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 status	Relay engaged: red LED Under voltage: green LED
Ambient temperature	-20° C – +50° C
Relative humidity	30 % – 85 % HR
Protection	IP20B according to DIN EN60529
Weight	0,18 Kg
Current in probes line
AC models	4 mA
DC models	3,2 mA
Voltage in probes line
AC models	24 V AC
DC models	6,2 V AC
Insulation voltage	2.500 V AC
Insulation resistance	>104 MΩ
Mechanical life	30x10 operations
Sensitivity
AC models	7 kΩ – 100 k
DC models	8 kΩ – 45 k
Materials:
Housing	Cycoloy
LED visor	Lexan
Buttons	Technyl
Terminals	Brass