26/02/2014 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 Type Characteristics Voltages ENRM Monitoring filling (UP) Monitoring emptying (DOWN) 24 V AC 84 870 211 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