KROHNE LEM 300 EN User Manual
Page 7
Installation and Operating Instructions LEM 300
7
4.2 Example
2
Pump1 is filling a tank to a certain level. The alarm is securing the tank from overflowing.
Tank: Non-Metal
Ground: Via one uncoated rod
Instrument: LS 7240, 3 coated rods, 1 uncoated.
Y3 + Y4 level: Alarm
1
Switches »Normally open«
2
230 V AC
3 Alarm
4 Reversing
relay
5 Pump
1
1
Z1 Y1 Y2 Y3 Y4 A1 A2 11 14 21 34
2
3
4
5
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