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Automated water change system 1

Discussion in 'Tank Mods & DIY' started by Neil, Mar 31, 2012.

  1. Neil

    Neil Registered

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    Well have sorted the automated water change system out

    I will be changing a very small amount of tank water each hour and replacing with new salt water

    with my system I'm only going to be changing the amount of water that's between the top up level switch down to the return pump (just a bit before it starts to suck air in)

    to do this I will be using my auto to up unit

    parts needed
    2 12volt relays
    some wire
    electrical joining strip
    2 more 12 volt pumps (old water removal pump my be a dosing pump)
    some form of timed 12 volt supply

    so how does it work

    well the auto top up unit works as normal toping up as required

    When the timer sends 12 volts to the first relay it stops power from the top up unit going to the pump via the second relay and starts to remove tank water

    At the same time it also switches the second relay changing the contacts from the RO top up pump to the salt renewal pump (no power will feed as the first relay is stopping it at this time)

    When the water level drops the level switch on the top up unit operates and power is sent to the second relay coil keeping it open when the timer shuts off

    When the timer shuts of the tank water removal goes of and power from the top up unit is allowed to go to the second relay then to the salt renewal pump

    When the water level reaches the level switch the top up unit turn of this cuts power the renewal pump and the second relay coil this then toggles back to the RO pump ready for normal operation

    Hope the above makes sense LOL

    For the system control I will be using my Aqautronica this I’m able to set times to come on and to stay on from a min of 1 second most people would be using a segmented timer that normally has segments of 15 minutes in this case the I would recommend a dosing pump is used

    [​IMG]
     
  2. reefloat

    reefloat Registered

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    and i thought i was bad!!!!
    what about float switch failure?
     
  3. Neil

    Neil Registered

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    this is the case with most top up systems but if using your twin float system should not be a problem I will be using my osmolator that has a high level float switch as well
     
  4. reefloat

    reefloat Registered

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    well thought out, is it actually in use yet?
    I would add a diode across the relay coils to prevent back EMF
     
  5. Neil

    Neil Registered

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    No as the new system not up and running yet and have been thinking of adding the diode
     
  6. Neil

    Neil Registered

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    picture of the prototype

    [​IMG]


    I have used two switched to simulate the auto top up and timer and 3 bulbs to simulate the 3 pumps
     
  7. screwloose

    screwloose Registered

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    could of saved you a lot of effort,,continuos water change in previous test was rubbish dude
     
  8. reefloat

    reefloat Registered

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    Reefchange AWC - lot easier :whistling:
     
  9. Neil

    Neil Registered

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    With a normal reef tank I would agree but with a NPS and the amount of food that will be feed its needed
     
  10. screwloose

    screwloose Registered

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    ahh i missed the nps bit,

    i remember mitch's being a slow downhil progression once he added the continuos WCS
     
  11. Neil

    Neil Registered

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    Was that because of doing that or some other problem as I know to well that a tank can look fine one day and with out doing anything different it goes down hill and sorry to say that is the nature of reef keeping
     
  12. Neil

    Neil Registered

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    I was using my own system like yours (but I was doing it before you) but that's changing a large amount of water at once this is for changing small amounts hourly or even less
     
  13. micky

    micky Registered

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  14. Smithyboi32

    Smithyboi32 Registered

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    Iv been thinking of doing a diy waterchanger ... I have a PLC and a few contactors but just too much going on for my head to deal with programming it at the moment lol
     
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