Intelligent Pump Controller M21 is an easy to use, programmable controlling & protection device for single phase deep well submersible pumps, surface pumps etc. It secures against a dry run, voltage drop, overload. It cooperates with liquid level probes, float switches, presssure switches. The product is supplied with a set of three liquid level probes.
There are three versions of the product: for single plase connections and three-phase connections with different power ranges. More data available here.
Floats. The automatic device controls the pump operation depending on the water level. The floats are available with 60cm, 5m and 10m hose.