22/10/2012 www.crouzet.com ENRM filling or emptying with adjustable time delay ENRM Part number 84870211 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 Characteristics Voltages 84 870 211 ENRM Monitoring filling (UP) Monitoring emptying (DOWN) 24 V AC 84 870 212 ENRM Monitoring filling (UP) Monitoring emptying (DOWN) 48 V AC 84 870 213 ENRM Monitoring filling (UP) Monitoring emptying (DOWN) 120 V AC 84 870 214 ENRM Monitoring filling (UP) Monitoring emptying (DOWN) 230 V AC Type Specifications Operating range Maximum power consumption 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) 3 VA 250 1 M 30 % 24 V AC (50/60 Hz) 1 mA (50/60 Hz) 10 nF 300 ms 500 ms 1 AgNi changeover relay 8 A AC max. Class II VDE 0551 2.5 kV AC -20 +50 C -40 +70 C 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 panel can be used to select the desired function and sensitivity range. A level can be monitored using the 2nd 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 selected 22/10/2012 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 k to 100 k), Up HS (High Sensitivity : 50 k to 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. No Legend 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 k to 100 k), Dwn HS (High Sensitivity : 50 k to 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. No Legend Level Relay Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected 22/10/2012 www.crouzet.com Principles Monitoring a level, filling function, deactivation time (level : 1 - off delay, function Up LS (Low Sensitivity : 250 to 5 k) or Up St (Standard Sensitivity : 5 k to 100 k) or Up HS (High Sensitivity : 50 k to 1 M). When the liquid level drops below the probe the relay energises immediately and remains on until the level of liquid reaches the probe again and remains above it for a period exceeding time delay T set on the front panel. If the level of liquid drops back below the level set before the time delay elapses, the relay remains on. Note When the power returns after a power break, the output relay energises immediately if the liquid level is below the threshold. No Legend Level Relay Principles Monitoring a level, emptying function, deactivation time (level : 1 - off delay, function Dwn LS (Low Sensitivity : 250 to 5 k) or Dwn St (Standard Sensitivity : 5 k to 100 k) or Dwn HS (High Sensitivity : 50 k to 1 M). When the level of liquid rises above the probe the relay energises immediately and remains on until the level of liquid drops back below the probe for a period exceeding the value of time delay T set on the front panel. If the level of liquid returns above the level set before the time delay elapses the relay remains on. Note When the power returns after a power break, the output relay energises immediately if the level of liquid is above the threshold. No Legend Level Relay Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected 22/10/2012 www.crouzet.com Principles Monitoring two levels, emptying function (level : 2, function Dwn LS (Low Sensitivity : 250 to 5 k), Dwn St (Standard Sensitivity : 5 k to 100 k), Dwn HS (High Sensitivity : 50 k to 1 M). The output relay remains open as long as the level of liquid has not reached the maximum probe. Once the maximum level is reached the contact closes and the tank can then be emptied (valve opened, pump started, etc). When the level drops below the minimum level the contact opens and interrupts the emptying process. Note : when monitoring two levels the time delay preventing the wave effect is not in operation. Note When the power returns after a power break, the output relay energises immediately if the level of liquid is above the threshold. No Legend Maximum level Minimum level Output relay : Down Principles Monitoring two levels, filling function (level : 2, function Up LS (Low Sensitivity : 250 to 5 k) or Up St (Standard Sensitivity : 5 k to 100 k) or Up HS (High Sensitivity : 50 k to 1 M). The output relay remains on as long as the level of liquid has not reached the maximum probe. As soon as the maximum level is reached the contact opens and pumping stops. When the level drops below the minimum level the contact closes again and pumping restarts to bring the level of liquid back up. Note : When monitoring the two levels the time delay preventing the wave effect is not in operation. Note When the power returns after a power break, the output relay energises immediately if the level of liquid is below the threshold. No Legend Maximum level Minimum level Output relay : Up Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected 22/10/2012 www.crouzet.com Dimensions (mm) ENRM Connections Adjusting two levels Monitoring filling "Up" A1-A2 : power supply No Legend Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected 22/10/2012 www.crouzet.com Common Off On Output Connections Monitoring emptying "Down" A1-A2 : power supply No Legend Common Off Output Unless otherwise specified, the characteristics given are applicable to all or part of the product range selected