You may recall a week or so ago I had an issue with the Tunze Osmolator failing just before I flew out of the country with a tiny piece of detritus on the optical sensor causing it to stop topping up.
I considered all sorts of options, a back up Osmolator, Apex ATK and finally went back to a basic physical system with no electronics to fail. A gravity fed ATO
I couldn’t risk using the 425 litre RODI tank for this because there would be a major siphon issue if the float valve failed. It would empty around 300 litres into the sump before the levels stabilised which is, well not good.
So my solution was to use a 30 litre container which I used to use to store RODI and I have many, so the maximum exposure if it failed would be 30 litres into the sump which would have no affect on the tank. This will last around 4 days during testing depending on temperature conditions etc.
Now 30 litres should be ok, as it would only be used if the Tunze Osmolator failed and for a few days, but what I’m also going to do if I feel necessary, is hook up a pump and hose from the 425 litre RODI tank into this smaller 30 litre container which I can switch on if need be via Apex and refill it manually from anywhere in the world. I could add some float switches but thats just things to fail or cause issues, so I think I’ll just time how long it takes to fill it and use that as a rough guide if I ever need to.
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