Need appropriate Sensor to Trigger the Gravity Flow for a pump

We have a water based flow system as shown in the attached picture.

Water is flowing through gravity in a 65 mm Pipe Line. But the flow of water through the pipe line would be intermittent. So to avoid the dry run on the pumps we want to trigger the pump contactor through a signal from the flow switch that we are planning to install in the pipeline.

The current model of flow switch that we are planning to use is as shown below:

http://spottrading.in/ProductImages/Honeywell_Wate...



But we are not sure if the flow switch can work as the flow switch, as the flow switch terminals are very high and we are not sure if flow gravity can generate enough pressure so that the flow switch can sense a signal

So can you please suggest a suitable Sensor for the Same

Hi,

How long is the pipe? I want to determine the pressure that the water produces to know if the flow meter can handle it or even operate at the most.

Hi Kevin,

The pipe is 50 meters long. The flow rate on average is 50 LPM on a pipe of 65 MM Dia.

Regards,
Siril K Thodeti