F40 DIGITAL PUMP CONTROLLER
The F40 Digital Pump Controller is a powerful self-contained microcomputer that controls and protects a pump under its command. The F40 provides a seamless environment for the pump and gives the end user all the advantages of constant flow and at the same time protects the pump against damage from being run dry. Constant flow means a smooth supply free from the pressure fluctuations that plague conventional pressure controlled pumps.
Pressure systems cycle between low and high pressure. Not because this gives the user any advantage but simply because a pressure differential is required to operate the pressure switch that normally controls such systems. The user sees the effect as annoying pressure fluctuations at the tap. If run dry for any reason, such a pressure system will run continuously and generally sustain serious damage because it has no means to sense the lack of water and shut down.
The F40 Digital Pump Controller monitors both flow and pressure and only allows the pump to run if water is present. In a typical application, the pump will start when there is a demand for flow or when the pressure falls. When demand ceases the controller continues to run the pump for a settable time that is sufficient to re-pressurise
the system. The pump will then automatically shut down. Such a system allows the selection of a pump that has an essentially flat pressure and flow curve and delivers a steady constant pressure over widely varying flows. An air cell is not needed in the system but can be included to reduce the frequency of pump starts. With
the F40 controller, the start-up pressure is set to start the pump at a pressure only marginally higher than the system’s static pressure. If the demand is too low to actuate the F40’s flow sensor, or if for any reason the pressure falls, the F40’s built-in pressure sensor will detect the pressure fall, automatically run the pump, re-pressurise
the system then shut down the pump and goes back to monitoring the whole system.