IFM Electronic AN002 Notice D'utilisation page 26

3.1 Functionality
7
Level control
1: Sensor 1 with normally closed output for input 1 (upper level)
2: Sensor 2 with normally open output for input 2 (lower level)
3: Tank with liquid or dry bulk material
4: Valve or pump (inlet)
5: Relay output
6: Transistor output
7: PLC or signalling device
Process
After switching on the device
Level is below both sensors
Level is above both sensors
Level is between the sensors
Relay energised, i�e� switched (transistor output switched)
26
In 1 In 2
6 5
1
2
3
Relay
de-energised
energised
de-energised
depending on the previous state
4