I'm looking to run one head of my DOS pump as follows:
- Run at full speed for a certain amount of time or volume which ever is easier to implement (note accuracy is really not important)
- Activate an EB outlet
- Dispense a measured amount of solution
- Deactivate an EB outlet
Run at full speed for a certain amount of time or volume which ever is easier to implement (note accuracy is really not important)
There can be a brief pause between steps. I would like to make this happen with a VO. It might take profiles and several VOs inside of it, this is really the heart of my question. I can handle scheduling this VO like a vFeed, etc...
Steps 1-5 probably don't make sense at first, so here is what my AB box is. It is 3(quantity) 24v solenoid valves. All 3 solenoids have a common liquid output rail into the DOS. Each solenoid has its own liquid input. All 3 solenoids are wired in parallel to a single 24v supply, so one EB outlet can change all of their states. Solenoid 1 is normally open and the liquid input is tank water. Solenoids 2 and 3 are normally closed and their liquid inputs are Reef Energy A and B. If the 24v power supply is off and the DOS is running it just pumps water from my tank back into my tank. If the 24v supply is energized the tank water input closes and the 2 additive ports open (step 3 dispense measured amount). Step 4&5 is to flush the measured amount from the output line length with tank water, Step 1&2 is similar and probably not needed, but might help clear any air bubbles and get a consistent prime.
I have tested this valve box manually and it works well. It might seem convoluted, but I had most of the parts laying around. I got bored one day and 3D printed a box and threw it together. I'll need to implement some magnetic stirrers, which I can figure out. I'd also add that this would be a bad idea for something like 2 part Cal/Alk due to precipitation mixing them. Something like Reef Energy AB that is supposed to be mixed at time of use should work.
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