0-10v output causing stray voltage?

[Stross70]

Ph probe and ORP probe higher when 0-10v is plugged in and activated. Anyone else experiencing this?

 

[Danny]

Ph probe and ORP probe higher when 0-10v is plugged in and activated. Anyone else experiencing this?

What is the 0-10v plugged into? Is it a 0-10v output or input?

 

[Stross70]

I have 0-10v output controlling a nautilus dc600 pump. Ph drops when I disconnect the 3.5mm plug from the nautilus, pump is still running

 

[Danny]

I have 0-10v output controlling a nautilus dc600 pump. Ph drops when I disconnect the 3.5mm plug from the nautilus, pump is still running

It is possible the pump is causing it since it is grounded to the controller if you use the 0-10v output from the controller. Try placing the probes in a cup or glass of tank water out of the tank as a test and see if it still has the issue if the probe in not actually in the tank.

 

[Stross70]

In a glass cup isolated from aquarium water ph is 8.11 with pump on turning the pump off the ph dropped 8.05~

 

[Danny]

In a glass cup isolated from aquarium water ph is 8.11 with pump on turning the pump off the ph dropped 8.05~

That is not the same as it was doing if I read right. So some of the interference could be from the water when the pump is on. Is the probes anywhere near the pump in question? If so try separating probes from the pump if you can. Also make sure any power cables especially for the pump are not run near the probe cables.