L2N plug
-
in filling/emptying function L2N Part number 84870401
Relay for controlling level of conductive liquids
Combined fill and empty functions
Combined regulation of pumping out a well and filling a tank
Plug in (11 pins)
Output relay status display LED
Sensitivity adjustable from 5 kΩto 100 kΩ
Part numbers
Specifications
Operating principle
Control of maximum and/or minimum levels of conductive liquids (tap water, sea water, waste water, chemical solutions, coffee etc).
The principle is based on measurement of the apparent resistance of the liquid between two submerged probes. When this value is lower than the preset threshold on the unit front face, the output
relay changes state. To avoid electrolytic phenomena, an AC current funs across the probes. Applications found in environmental, chemical industries and food technology etc.
Combined Fill / Empty function
The output relay changes state when the level of liquid in the tank reaches the "max" electrode, with the "min" electrode submerged. It returns to its initial state when the "min" sensor is no longer in
contact with the liquid.
When the level of liquid in the well reaches the "min" electrode, the pump stops.
If, on power-up or after a power break, the "max" electrode in the tank is above the surface, reset the device by pressing the PB pushbutton.
Type
Supply voltage
Base
84 870 401
L2N
24 V AC
11-
pin
Supply voltage Un
230 V, 110 V, 48 V, 24 V AC, 50/60 Hz
Operating range
0,85→1,15xUn
Max. absorbed power
3 VA
Adjustable sensitivity
5 k
Ω
→100k
Ω
Measurement accuracy (at maximum sensitivity)
0→+30%
Electrode voltage (max)
24 V AC (50/60 Hz)
Electrode current (maximum)
1 mA (50/60 Hz)
Maximum cable capacity
10 nF
Response time high level
300 ms
Response time low level
500 ms
Output relay (according to AC1 resistive load)
1 AgCdO switch 8 A AC max.
Galvanic isolation via transformer (4 kV, 8 mm creepage
distance)
Class II
Isolation of contacts and electrodes from power supply
2,5 kV AC
Temperature limits use (°C)
-
20→+60
Temperature limits stored (°C)
-
30→+70
Weight (g)
140
Principles
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
23/06/2014 www.crouzet.com
Note
The probe wire (max length 100 metres) does not have to be screened, but avoid mounting it in parallel with the power supply wires. A screened wire can be used, with the screening connected
to the common.
TRADOS Empty Field
N
o
Legend
Push button
Well
Tank
Output relay
Dimensions (mm)
LN2
Dimensions (mm)
LN2 : connector sockets
8-pin : 25 622 129
11-pin : 25 622 078
Connections
L2N
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
23/06/2014 www.crouzet.com
Special base : -
Pin 5 : common becomes max.
-
Pin 7 : maxi. becomes common
N
o
Legend
Push button
Output
Tank
Input
Common
Wells
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
23/06/2014 www.crouzet.com
