The DPS 300 is a low range HVAC differential pressure sensor for measuring pressure drops across air filters and airflow through and between ventilation ducts. The lowest possible pressure range is 0...100 pascals and the highest is 0...1000 millibars. User switchable 2 or 3 pressure ranges and volts or current output are included with most standard configurations.
I am hoping to use a borehole where the pump is about 25m below the surface. I would like the pump to operate automatically by switching on when the water has returned to about 14m below ground level and off at about 20m below the ground.