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 k to 100 k Part numbers Type Characteristics Voltages Code ENR Monitoring filling (UP) z 84 870 200 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 5 k 100 k 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 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) ENR 68 44 22.5 23.2 5.5 1 67.5 45 2.6 90Connections ENR U + A1 C Min Max 11 R U A2 12 14 A1-A2 : power supply Principles Monitoring filling or emptying ENR Operating principle Un Monitoring maximum and/or minimum levels of conductive liquids (tap water, sea water, waste water, chemical solutions, coffee, etc). The principle is based on measuring the apparent resistance of the liquid between two T submerged probes. When this value is lower than the preset threshold displayed on the units 1 front panel, the output relay changes state. To prevent any occurrences of electrolysis, an AC 2 current is passed through the probes. Areas of application include the agri-food, chemical and other industries. Down 3 Adjusting two levels : Minimum/Maximum Up 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 inU mode and is de-energised when inDOW mode. 1 Maximum level Minimum level 2 3 Output relay : Down or Up 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