ACjr. Q. with Cal. reactor

[vinny]

I thought I had this running right but I think that I was dead wrong. I have it as: "If PH < 08.00 then co2 off" and "If PH > 08.3 then co2 off". What shuts off is the solenoid to the co2 bottle and not the pump to the reactor. The media is still full not sure what I did wrong.

 

[smcnally]

You also need to tell it when to turn on.

 

[MikeG]

Are you monitoring the tank pH or the effluent of your reactor?

If you are measuring the the tank pH then you want
If pH < 8.0 then CO2 off, and If pH is > 8.1(or what ever you choose) then CO2 on

You need a command in there somewhere to turn it on as Steve said. With the way you have it now, it turns the pH off it will never turn it back on even if the value goes back into the range you want since you don't tell it to ever turn on.

If measuring the effluent of the reactor then
If pH < 6.7 then CO2 off and If pH > 6.8 then CO2 on

Again use the pH values that make sense to you.

And if you have an ACIII with 2 pH probes, you can do both the tank pH and the Calcium reactor effluent.

 

[vinny]

I've always thought that the reactor stays on and I tell it when to shut off. It's dripping into a collection cup and that were my PH probe is in.

 

[MikeG]

Nope once you shut the outlet that the solonoid is plugged into off, it should not turn back on with out a command telling it to do so.

Also if you are measuring the effluent your code makes no sense to me. You will not have a high pH set limit. You should have a low limit and that should be somewhere around 6.6-6.8 which is where you get the best dissolution of the media. If you don't have the pH in the reactor go below 8.0, I doubt the media will disolve at all.

If it is disolving too much media based on tank demand then you can slow down the flow from the effluent to the tank or raise the low pH limit in a little

 

[Reef55]

You always want water flowing through the reactor... what you turn on and off is the CO2 being added to the reactor via the solenoid.

You use the AQ jr to monitor your tank's pH, and set it to shut off the solenoid for adding CO2 if your pH drops too low. So basically, CO2 is ON unless the pH drops too low.

You want something like this, in this order:

IF time > 00:00 then CO2 ON (so CO2 is always on first)
If pH < 08.00 then CO2 OFF (if pH is too low, turn off the CO2)
MAX change 010M then CO2 OFF (when CO2 turns off, keep it turned off for 10 minutes. This prevents the solenoid from turning on and off really fast if the pH is hovering around 8.00)