Crouzet 84870200 Data Sheet

Level control

➜ ENR

■ Regulation of two levels (minimum / maximum)

■ Monitoring filling (UP) or emptying (DOWN), selected by

a switch on the front panel

■ Probes supplied with AC current

■ Sensitivity adjustable on front panel from 5 kΩ to 100 kΩ

Part numbers

Type Characteristics Voltages Code

ENR Monitoring filling (UP)

Monitoring emptying (DOWN)

24

General characteristics

Characteristics

Supply voltage range
Operating range
Maximum power consumption a
Adjustable sensitivity 5 kΩ

Measurement accuracy (at maximum sensitivity) ± 30 %
Electrode voltage (max)

Electrode current (maximum) 1 mA
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 changeover relay 8 A AC max.
Isolation of contacts and electrodes from power supply

Operating temperature range (°C) -20
Storage temperature range (°C) -40
Weight (g) 91

24

20.4

12 V

2.5 kV

z

➞ 240 V

z

➞ 240 V

5 VA, c 1.5 W

➞ +50 °C
➞ +70 °C

➞ 264 V

➞ 100 kΩ

a

a

z

84 870 200

Dimensions (mm)

ENR

68

44

45

67.5

23.2

5.5

22.5

90

2.6

1

Connections

ENR

U

+

A1

C Min Max

11

U

_

R

12 14A2

A1-A2 : power supply

Principles

Monitoring filling or emptying ENR

Un

1
2

Down

3

Up

Maximum level

1

Minimum level

2

Output relay : Down or Up

3

Operating principle

Monitoring maximum and/or minimum levels of conductive liquids (tap water, sea water, waste
water, chemical solutions, coffee, etc).

T

The principle is based on measuring the apparent resistance of the liquid between two
submerged probes. When this value is lower than the preset threshold displayed on the unit’s
front panel, the output relay changes state. To prevent any occurrences of electrolysis, an AC
current is passed through the probes. Areas of application include the agri-food, chemical and
other industries.

Adjusting 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 1 second or more, the relay reenergises when in "UP" mode and is
de-energised when in "DOWN" mode.

Other information

Note

The probe cable (maximum length 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 terminal.

2