ATO water level sensor failing

[triller]

I was wondering if there is a way to tweak the sensitivity of the water level sensors? The one at the bottom of my ATO appears to be stuck on dry for a few days.

When I switch from water level to a diagnostic sensor, I am getting a reading of ~3.15 volts in the water and 4.0 volts out of the water. I guess another question would be if anyone knows the voltage threshold for the water level sensor to indicate that it is wet.

The tank water level sensor I have reads 0.45 volts while wet.

 

[Danny]

There is an issue with that sensor. I use the same input with float switches and they are either open or closed so it goes from almost no voltage to near 5 volts depending if it is open or closed.

 

[ggdowski]

That is why I interfaced the Milone water level sensor that provides a voltage that is proportional with water height. I can set the level of the water in my sump without moving the sensor.

 

[Danny]

I added redundancy to my ATO and AWC using 3 more drive ports and three relays. I have screenshots of the output settings and explanations on ky build thread on Reef Central. Here is the link Hex Tank Build It is post #142 and #143. Here is a schematic. Basically two drive ports have to be in the correct state for either of the three motors to run. The two ports for each motor are on different controllers. So I would have to have an issue with two different controllers for the pumps to stay on to a point where they would drian or overfill past the sump high or sump low sensors if the other sensor was to fail or I leave one on in override.

 

[JeffB418]

I was wondering if there is a way to tweak the sensitivity of the water level sensors? The one at the bottom of my ATO appears to be stuck on dry for a few days.

When I switch from water level to a diagnostic sensor, I am getting a reading of ~3.15 volts in the water and 4.0 volts out of the water. I guess another question would be if anyone knows the voltage threshold for the water level sensor to indicate that it is wet.

The tank water level sensor I have reads 0.45 volts while wet.

Yeah this sounds like a failed sensor. Water can get into these overtime and cause this to happen. I regularly check mine for water intrusion and lately have been using a small amount of aquarium silicone around the area where the cord enters the housing to try and prolong the life.