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R AUTOMATION

Level Controller - 23926 ULW

Level guard

Sensing of 1 level. With probe cable supervision

Basic functions

Max - 1 switching point Fill, Leakage Alarm, Overflow Protection ... • Conductive measurement principle (for conductive media)• Basic function: issue an alarm notification e.g. for leakage‘s or overfilling• Sensitivity is adjustable• LED indicators for Alarm - Ready - Stop• Probes are operated with alternate current signal • Supply and measurement signal are isolated from each other• Supervision of the probe cable: in the case of damage or interruption in the probe cable, the Stop state will be entered. Protection class: Housing IP40; Terminal IP20 with captive, touch protected screws

Technical data

Supply voltage: 230V AC Dimensions: L 75 x B 55 x H 110mm on request: 24V AC, 42V AC, 115V AC Housing: Output: Quick install onto standard DIN rail to DIN EN 50022 1 SPDT energised for action Supply frequency: 50-60 Hz Switching voltage: max. 250V AC Tolerance: -15% to +10% Switching current: 6A Power consumption: max. 2,5VA, Power On time: 100% Ambient temperature: -20°C up to +60°C Probe voltage:

Functional description:

1. On power-fail, the output terminals will be switched as inthe Alarm state. There can’t be optical indication for this state. The level probe and the level guard, model ULW, form one functional unit. The level guard monitors the current throughthe electrodes, which will raise as soon as any conductive liquid connects the tips of the electrodes. The guardian will then activate the relay and operate the switch-over-contacts, by that the terminals 1 and 3 (Alarm status) are connected. The system is designed to provide a fail-safe operation: 2. In the possible case of an interruption in the probe cable, the guardian will switch to the Alarm state. This feature is implemented by mounting a resistor between the two electrodes in the probe connector housing. There will be a small idle current flowing through this resistor, even without that the tips are moisten. On cable interruption the yellow LED (Stop) will indicate this error and the terminals 1 and 3 are connected to issue an alarm. Level guardLED redLED greenLED yellowContact positionState No Power Supplyoffoffoff1-3Alarm Power Supply OK: Probe do not contact the liquidoff

on

off1-2ReadyProbe contact the liquid

on

offoff1-3AlarmCircuit break between level probe and guardoffoff

on

1-3Stop (Alarm)