Six NOT gates from the IC 4049 may also be used to create a completely automatic version of a motor dry run protection circuit as seen below. This setup should operate far more precisely than any transistorized version of the automatic underground submersible water pump dry run protection.
Questions from a Dedicated User of this Design
Hi, Admin
Your reasoning and concept are fantastic. Bravo to you. I tested the IC4049 version, and aside from one problem, it functions flawlessly.I made a change based on your earlier design, and it is now functional.
One problem I'm having with the IC version is that the dry run function doesn't work once we set it in automatic mode. Kindly examine the simulated video clip attached.
Example 1: I see Relay will turn on the pump if the water level drops below the bottom level, however it won't detect a dry run, thus the pump will keep running.
Case 2: It functions flawlessly when operated manually. I apologize for any typos.
Resolving the Circuit Issue
Indeed, you are correct.
You may try attaching a 10uF here. In order to fix the issue, we will require to hook up the output of N6 to the base of the BC547 via a capacitor.
The capacitor's negative will flow towards the base.
The issue is that this action only turns on the system a single time; should water fails to be detected, the device will turn off the relay and stay turned off indefinitely unless the switch is physically turned on once more and the yellow sensor makes contact with water once again.
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