Try using low pressure/vacuum switches. Use PVC tubing to connect the switch to a solid tube of suitable material that is held in the sump. You could use two switches, one at low level the other at high level and use your existing system. Or just the high level, and a timer as you mention in...
I have been asked by a “Friend” to reconnect a motor on an air compressor. The compressor was bought “second hand”. The notation on the four motor terminals are :
A, Z, AZ and T
I have assumed this is a single phase 240 Volt 50Hz a.c. motor. I have had experience with 3 phase motor...