KROHNE LEM 300 EN User Manual
Page 8
8
Installation and Operating Instructions LEM 300
4.3 Example
3
A tank is being filled with waste water. Pump 1 is supplying a filter unit. Pump 2 is securing the
tank from overflowing.
Tank: Non-metal
Ground: Via one uncoated rod
Instrument: LS 7240, 3 coated rods, 1 uncoated.
< Y1 + Y3 level: Stop Pump 1 + Pump 2
> Y2 level: Start Pump 1
> Y4 level: Start Pump 2
1
Switches »Normally open«
2
230 V AC
3 Pump
1
4 Pump
2
1
2
3
4
Z1 Y1 Y2 Y3 Y4 A1 A2 11 14 21 34
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