Hello everyone.
I am disabled and need to have a walk in shower facility.
The pump unit that I have installed is a 24v unit with a NO flow sensor in the supply pipe. The trouble is that the control unit associated with the system has failed (it fails to turn the pump on) but I know that both the flow sensor works (closes on water flow as tested by meter) and the pump itself is working fine as I have temporarily fitted it up using an old laptop power supply.
A new pump controller to match my system is prohibitively expensive and therefore I want to build a simple control circuit of my own to run the pump using the aforementioned laptop power supply.
What I had in mind was that a DPDT relay is latched on by the flow sensor through the coil when water is flowing This is not a problem. However, I also need some sort of over-run facility to pump out the 'drain-down' water initially and then, after a delay, a further short activation to clear any remaining water in the tray. That is; a two stage over-run.
I do not have any great facility in electronics and so a simple, discrete component circuit board would be necessary. I do have enough savvy though to ensure that all of the main voltage equipment is outside the shower room.
Any help would be very much appreciated.
I am disabled and need to have a walk in shower facility.
The pump unit that I have installed is a 24v unit with a NO flow sensor in the supply pipe. The trouble is that the control unit associated with the system has failed (it fails to turn the pump on) but I know that both the flow sensor works (closes on water flow as tested by meter) and the pump itself is working fine as I have temporarily fitted it up using an old laptop power supply.
A new pump controller to match my system is prohibitively expensive and therefore I want to build a simple control circuit of my own to run the pump using the aforementioned laptop power supply.
What I had in mind was that a DPDT relay is latched on by the flow sensor through the coil when water is flowing This is not a problem. However, I also need some sort of over-run facility to pump out the 'drain-down' water initially and then, after a delay, a further short activation to clear any remaining water in the tray. That is; a two stage over-run.
I do not have any great facility in electronics and so a simple, discrete component circuit board would be necessary. I do have enough savvy though to ensure that all of the main voltage equipment is outside the shower room.
Any help would be very much appreciated.