Level control ENRM 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 Code ENRM Monitoring filling (UP) z 84 870 210 24 240 V Monitoring emptying (DOWN) General characteristics Characteristics Supply voltage range z 24 240 V Operating range z 20.4 264 V Maximum power consumption a c 5 VA, 1.5 W Adjustable sensitivity 250 1 M Measurement accuracy (at maximum sensitivity) 30 % Electrode voltage (max) a 12 V 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 AgNi changeover relay 8 A AC max. Isolation of contacts and electrodes from power supply a 2.5 kV Operating temperature range (C) -20 +50 C Storage temperature range (C) -40 +70 C Weight (g) 91 Dimensions (mm) ENRM 68 44 22.5 23.2 3.5 5.5 Connections ENRM U + 11 A1 C Min Max R U A2 12 14 1 67.5 45 2.6 90Principles 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 units 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 nd 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 relays state. When the green and yellow LEDs are flashing, this indicates an incompatible adjustment position. Rotary switch in mode 2 - Activation time - Filling function Monitoring a level, filling function, activation time U (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 1 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 TT T T come on. 2 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. Level 1 2 Relay Rotary switch in mode 2 - Activation time - Emptying function Monitoring a level, emptying function, activation time U (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 1 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 TT T T not come on. 2 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. 1 Level 2 Relay Rotary switch in mode 3 - Deactivation time - Filling function Monitoring a level, filling function, deactivation time U (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 1 the level of liquid reaches the probe again and remains above it for a period exceeding time delay T set on the front panel. T T T If the level of liquid drops back below the level set before the time delay elapses, the relay T remains on. 2 Note When the power returns after a power break, the output relay energises if the liquid level is below the threshold. 1 Level 2 Relay 2