Crouzet EN, END Catalog Page

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84 870 104
84 870 103

84 870 102

84 870 101

84 870 004
84 870 003

84 870 002

84 870 001

Relay for controlling level of conductive liquids EN / END

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 runs 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 : If the power break ∆T lasts for 0.5 seconds or more, the relay re-
energises instantly if in "UP" mode and is de-energised if in "DOWN"
mode.

Supply voltage Un 230 V , 110 V, 48 V ,

24 V a, 50 / 60 Hz
Operating range 0.85 • 1.15 x Un*
Maximum power

3 VA
consumption

Adjustable sensitivity 5 kΩ to 100 kΩ
Measurement accuracy

0 • + 30%
(at maximum sensitivity)

Electrode voltage

24 V a (50 / 60 Hz)
(maximum)

Electrode current

1 mA (50 / 60 Hz)
(maximum)

Maximum cable

10 nF
capacity

Response high level 300 ms
time low level 500 ms
Output relay (according 1 AgCdO changeover
to AC1, resistive load) 8 A a max.
Galvanic isolation via
transformer (4 kV, 8 mm Class II VDE 0551
creepage distance)
Isolation of contacts and

2.5 kV a

electrodes from power supply
Temperature use - 20 °C to + 60 °C

stored - 30 °C to + 70 °C

Weight 140 g

Note

The probe cable (maximum 100 metres) does not have to be screened,
but avoid mounting it in parallel with the power supply cables.A screened
cable can be used, with the screening connected to the common.

* Voltage limited to Un + 10% if other products are mounted adjacently
on the same DIN rail.

EN
EN END

230 V a
120 V a
48 V a
24 V a

"UP" filling control
"DOWN" emptying control

Types

Part numbers (and voltages)

Technical specification

1

■ Regulation of two levels :

- Minimum

- Maximum

■ Monitoring of filling "UP" or emptying "DOWN"

selected by a switch on the front face

■ Probes use an AC current

■ Sensitivity adjustment on front face via potentiometer

■ Sensitivity adjustable from 5 kΩ to 100 kΩ

Other information

Standard

products

Standard products,
non stocked

To order,specify :

Part numbers
Example : Relay for controlling level of
conductive liquids EN - 84 870 004

1

For connections, see page 3/29
For conformity, common characteristics, see page 3/35
For dimensions, see page 3/36

Un

T

Unit
power-up

Minimum level

Filling
function

Emptying
function

Controlled level

Maximum level

Output
relay

Down
or
Up

Unit
power-up

Minimum level

Emptying
function

Controlled level

Maximum level

Output
relay

Down

FILLING OR EMPTYING CONTROL (EN)

EMPTYING CONTROL (END)

Un

T

3

3/29

Wiring diagrams and applications

U

A1 C Min Max

R

11

12 14A2

U

A1 - A2 : Power supply

EN / END

EN / END

Stop

Output

Common

Max.

EN

Regulating two levels

"Up" filling control

Stop
Start
Output

Common

Max.

Min.

"Down" emptying control

Input
Start
Output

Common

Max.

Min.

R
S

T

N

S

A1 11

C

Max

R

12 14 A2

R
S
T

N

MP

S

A1 11

C

MaxMin

R

12 14 A2

MP

R
S
T

N

M

P

S

A1 11

C

MaxMin

R

12 14 A2