23/06/2014
www.crouzet.com
LN plug-in emptying function LN Part number 84870304
Relay for controlling level of conductive liquids
Regulation of two levels :
- minimum
- maximum
Empty function
Plug in (8 or 11 pins)
Sensitivity adjustable from 5 kΩ to 100 kΩ
Part numbers
Type
84 870 304
LN
Supply voltage
230 V AC
Base
8-pin
Specifications
Supply voltage Un
Operating range
Max. absorbed power
Adjustable sensitivity
Measurement accuracy (at maximum sensitivity)
Electrode voltage (max)
Electrode current (maximum)
Maximum cable capacity
Response time high level
Response time low level
Output relay (according to AC1 resistive load)
Galvanic isolation via transformer (4 kV, 8 mm creepage
distance)
Isolation of contacts and electrodes from power supply
Operating temperature range (°C)
Storage temperature range (°C)
Weight (g)
230 V, 110 V, 48 V, 24 V AC, 50/60 Hz
0,85 →1,15 x Un
3 VA
5 kΩ→100 kΩ
0 →+30 %
24 V AC (50/60 Hz)
1 mA (50/60 Hz)
10 nF
300 ms
500 ms
1 AgCdO switch 8 A AC max.
Class II
2,5 kV AC
-20 →+60
-30 →+70
140
Principles
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.
Regulation of two levels : Minimum / Maximum
The output relay changes state when the level of liquid reaches the maximum electrode, with the minimum electrode submerged. It returns to its initial state when the minimum probe is no longer in
contact with the liquid.
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.
N
o
Legend
Max. level
Min. level
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected
Microcontroller MCU
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