Apex Control of CaRx

[menglish]

Fellow control freaks,

I need some help.

For the past few months, the solenoid on my CaRx has only been running in the on position, meaning, CO2 is always on and as a result, the CO2 that do not last as long as it used to.

I have attached screen grabs of my codes and current situation. 

I can manually switch it to off and the solenoid would close, but with the programming, it never turns off.

What am i missing here? I know the codes are good, but i cant figure this out.

any suggestions?

I have even calibrated both the tank ph and the CaRx probes, but it makes no difference.

 

 

 

Much thanks

[WheresTheReef]

Try adding Set OFF after Fallback OFF in CaRx_CO2 so it defaults to the off state and comes on if the ph raises above your threshold.

[WheresTheReef]

Another thing, does you ph ever drop below 6.3 to trigger the OFF condition? The lowest point in your graph above is only 6.39 (within logging rate - 10mins by default). Can you adjust the ON/OFF ph conditions? What is your target ph range?

Edited September 16, 2023 by WheresTheReef

[menglish]

I think I found the reason why.

The valve controlling the flow rate out of the CaRx was completely open, pushing out more that 600 ml/min so the pH in the reactor was not getting low enough. I have closed the valve and it now looks ok.

 

Thank all

 

Milton