I have a well pump that is actuated by low pressure on the 'tap' side. Either a physical tap is opened manually or an actuator opens a solenoid driven valve.
the pump has a controller that contains this low pressure sensor. The controller also has a dry run shutoff which I am told (by the blurb) is magnetic but which, when fired, results in a physical shut off of the machine which then must be reset manually
No problem save that it's under a 100kg manhole and I'm not often in the same country, yet the garden still has to get watered... the well runs dry frequently due to farmers in the area also taking from the same aquifer.
I've thought about relocating the pump controller. But that's not going to happen in the short term.
I'm looking to remove the pump controller completely and instead have a direct coupling with the motor being controlled by a microprocessor. This can be turned on/off at the same time as the automatic valves (via a high power relay). A current sensor can be used to check for dry running.
But this does not solve the use case of the manual tap. I could just use a remote control but I would rather mimic the low pressure sensor. Is such a thing generally available to the hobby market (and at hobby - 10USD) prices?