tunze ph/valve controller

[Broly_PT]

Hello friends, I need your help.

I have a 7070 tunze ph controller with a 7074 co2 tunze valve to control my calcium reactor.

Since yesterday that something is happening, the ph readings are quite irregular.

It seems that the controller does not open / close the valve when it should or the valve itself do not know.

one thing I noticed whenever I touch the plug of the electricity that feeds the valve the value of ph changes automatically.

Has anyone ever had something similar? What can I do?

regards

 

[DLHDesign]

Sounds like you could have a short somewhere causing some stray voltage in the tank (potentially with the valve?). pH probes work by detecting voltage, so if you have stray voltage in your tank, it will mess them up and lead to faulty readings.
I would suggest unplugging the reactor for a bit and seeing if the pH readings return to normal.

You could also follow @Brew12's advice here.