Answer / prakash

If your concerns with domestic water pump dry run control,
then you can use a floating switch at level point that can
be connected to series with DOL starter if already installed.

Answer / jimmy

Just put level switch NC contact in series with overload
contacts in the Starter Circuit.

Answer / kamal

By using under current relay , setting is no load current,
below this level it trip.

Answer / parth belani

We can protect a pump from no load running by using a
minimum recirculation line. This line connects outlet with
the main tank or the inlet. so there will always be some
minimum flow through the pump.

Answer / raghu

Use a dryrun protection

Answer / sandip paithankar

put a moisture sensor in land which need to wet on starting and ending point of it.then give to transistor then micro controller do if else program and understand the condition of land it may wet or dry.then give command to relay to operate the water pump    

Answer / ks

by using the level transmitter and with out plc with some
no nc additional elements in the contactor it is possible
to control.

Answer / subrat.das1985

i think we can over come from this problem by using proximity sensor.or by using timer .

Answer / mkk

by using level transmitter. and use it in plc to switch off
the pump when level remains 20 %.

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