26/02/2014 www.crouzet.com
ENRM filling or emptying with adjustable time delay ENRM Part number 84870214
Regulation of 1 or 2 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 250 to 1 M .
Time delay preventing wave effect adjustable from 0.1 to 5s.
Part numbers
Type Characteristics Voltages
ENRM Monitoring filling (UP) Monitoring emptying (DOWN) 230 V AC
84 870 214
Specifications
Operating range 0.851.10xUn
Maximum power consumption 3 VA
Adjustable sensitivity 250 1M
Measurement accuracy (at maximum sensitivity) 30%
Electrode voltage (max) 24 V AC (50/60Hz)
Electrode current (maximum) 1mA (50/60Hz)
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 AgNi changeover relay 8 A AC max.
Galvanic isolation via transformer (4 kV, 8 mm creepage
Class II
distance)
Isolation of contacts and electrodes from power supply 2.5 kV AC
Operating temperature range (C) -20+50C
Storage temperature range (C) -40+70C
Weight (g) 150
Principles
Operating principle
General principle:
The ENRM monitors the levels of conductive liquids. 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 relay changes state. To prevent any occurrences of electrolysis, an AC current is passed through the probes. A rotary switch on the front
nd
panel can be used to select the desired function and sensitivity range. A level can be monitored using the 2 rotary switch.
In this instance, the max. probe remains above the liquid and an adjustable time delay prevents the wave effect.
A green LED indicates that the supply voltage is present.
A yellow LED indicates the output relay's state.
When the green and yellow LEDs are flashing, this indicates an incompatible adjustment position.
Principles
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected26/02/2014 www.crouzet.com
Monitoring a level, filling function, activation time
(level: 1 - on delay, function Up LS (Low Sensitivity: 250 to 5 k), Up St (Standard Sensitivity: 5 kto 100 k), Up HS (High Sensitivity: 50 kto 1 M).
When the level of liquid drops below the probe for a period exceeding the value of time delay T set on the front panel, the relay energises and remains on until the level of liquid reaches the probe
again.
If the level of liquid returns above the level set before the time delay elapses, the relay does not come on.
Note
When the power returns after a power break, the output relay only energises after time delay T if the level of liquid is below the threshold.
o
Legend
N
Level
Relay
Principles
Monitoring a level, emptying function, activation time
(level: 1 - on delay, function Dwn LS (Low Sensitivity: 250 to 5 k), Dwn St (Standard Sensitivity: 5 kto 100 k), Dwn HS (High Sensitivity: 50 kto 1 M).
When the level of liquid rises above the probe for a period exceeding the value of time delay T set on the front panel, the relay energises and remains on until the level of liquid drops back below the
probe.
If the level of liquid drops back below the level set before the time delay elapses the relay does not come on.
Note
When the power returns after a power break, the output relay only energises after delay time T if the level of liquid is above the threshold.
o
Legend
N
Level
Relay
Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected