DIY float switch system

Discussion in 'Anything DIY related' started by Toy, Nov 8, 2019.

  1. Toy


    May 24, 2019
    Likes Received:
    Warning: Project is for dc operate equipment only, if using ac powered powerhead, use a dc/ac relay.

    As every sump user would know, your tank's inflow must never be greater than the outflow.

    Most of the times this is achievable with a bit of tweaking of the valves but there is always room for failure which results in a wet floor/carpet and an angry spouse xD

    In my case the main issue with balancing the flow is the unreliable power source provided by Eskom, there is frequent changes in the voltage which influences the performance/flow of the powerheads. There are also other factors which must be considered such as blockages in the outflow ect.

    This is a very simple, fast build and relatively cheap diy project with the following hardware/tools requirements:
    • Float switch (I picked up one from for R54).
    • Some insulated coper wires.
    • 12 v dc power supply (used old one from Mikrotik routerboard).
    • 5 pin DC relay (R50 at local Midas).
    • Wire-stripper.
    • Side-cutter.
    • Insulation tape.
    • Soldering Iron and some solder.
    • Heat shrink insulation.
    • 20mm pvc t-connection.
    • Dremel tool.
    • Cable tie.
    • Multi-meter.
    Float switch 1.jpg

    Step 1: Use Dremel tool and make a clip on connector for the float switch.Float switch 2.jpg Float switch 3.jpg
    Step 2: Extend the float switch wires.
    Float switch 4.jpg
    Step 3: Connect the relay inline to the wires from the float switch (use pin 85)
    Float switch 5.jpg

    Step 4: Connect the 12 v power supply inline to the wire from the float switch and the relay (use pin 86)
    Float switch 7.jpg

    Step 5: Use a multi-meter and test for connection between pin 30 and 87a on relay (contact will be made between pin 30 and 87a as long as power is not applied to the relay via float switch from dc supply)
    Float switch 6.jpg

    Step 6: Solder wires to pin 30 and 87a of relay
    Float switch 8.jpg
    Step 7: Cable tie and insulate the relay
    Float switch 9.jpg Float switch 10.jpg

    Step 8: Use wires which connects to pin 30 and 87a of relay, and connect inline between powerhead power supply of powerhead on the positive line.
    Float switch 11.jpg
    Float switch 12.jpg

    Step 9: Clip float switch onto strainer pipe in tank and adjust according to water level requirement. Note that most float switch models can be adjusted by turning float around (top-bottom) in order for on to be at top position of float switch.
    Float switch 13.jpg

    Step 10
    : Connect all power supplies and enjoy your tank with the knowledge that there is now one thing led to worry about xD
    David Kusner, Barry Roux and T. Guppy like this.

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