KROHNE LEM 300 EN - Manual (Page 6)

6 Installation and Operating Instructions LEM 300
4 Application Example
4.1 Example 1
A tank is being filled with waste water. Pump 1 is supplying a filter unit. Pump 2 is securing the
tank from overflowing.
Tank: Metal
Ground:
Via the LS 72XX process connection
Instrument: LS 7240, 4 coated rods.
< Y1 level: Stop Pump 1
> Y2 level: Start Pump 1
< Y3 level: Stop Pump 2
> Y4 level: Start Pump 2
Y1
Y2
Y3
Y4
Switch (Pump 1)
Switch (Pump 2)
1 Switches »Normally open«
2 230 V AC
3 Pump 1
4 Pump 2
5 Max.
6 Min.
1
2
3
4
5
4
6
5
3
6
Z1 Y1 Y2 Y3 Y4 A1 A2 11 14 21 34