d,
Since the IntellipH uses the SWCG power to run, then the pump must be running off of 30 to 40 volts DC.. The only voltage that goes to the cell is DC...
Jim R.
From the front label on my IntellipH controller, verify yours reads the same:
Here's a couple on Amazon that would likely work, either less than 10 bucks:
With a standard AC plug:
Amazon.com: COOLM 24V 1A 24W DC Power Supply Adapter 100-240V AC to 24V DC Power Transformer AC/DC Power Adapter Charger DC Connector Size 5.5mm x 2.5mm with US Plug: Electronics
Perhaps one you could mount and wire inside your ET:
Amazon.com: Aiposen 110V/220V AC to DC 24V 1A 24W Switch Power Supply Driver,Power Transformer for CCTV Camera/Security System/LED Strip Light/Radio/Computer Project(24V 1A): Electronics
I'd be tempted to wire up a transformer to an ET circuit, which means I could schedule it, and set it up so that it could only run when the pump did. Though I'm not sure how fine a control you get with an ET.
I gotta hand that back over to Jim.
Jim - Can he schedule one of his relays for as little as a minute (assuming he has an available relay)? Maybe twice a day? And ensure it only goes off when the main pump is running? He'd be operating without a flow switch this way, which is a bit risky. That'd be a whole other level of circuitry needed. I guess he could add a flow switch and wire that in series somehow, so that even if the schedule fired, the pump wouldn't get voltage unless the flow switch was closed (flow on).
dfattfp - Do you have any available relays? Do you have one or more available schedules?
If your ET can schedule something for as little as a minute at a time, and you need more acid than that, you could split that up: one minute twice a day, three times a day, etc, to even out your distribution. If you need less than a minute of acid injection, then you'd either need a dedicated timer that could do that, or you could dilute your acid in the tank, as in:
1 minute of 15% (1:1 dilution) acid would = 30 seconds of 31%, etc.
You're supposed to dilute the acid in the tank 1:1 anyway, but you could dilute further:
1 minute of 8% would equal 15 seconds of 31%.
Just a matter of figuring out the scheduling and dilution that works for your pool. In my thread I discuss a couple ways to get diluted acid into the tank.
I would wire up the pump motor to the transformer, remove the injector from your system, then run it for a minute into a measuring cup (gloves, mask and eye protection in place, or course!), then measure what came out. Do that a few times to get a good average, then base my scheduling on that and the known amount you need for your pool (whatever you've been adding manually). Just a little math...