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Old 11-12-2017, 13:22   #151
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Re: Rule Bilge Pump Float Switch Problems

Plus one for the Ultra Junior. I don't know offhand who's float switch I had previously. I don't care. The Ultra Junior is simple, built like a brick, and flat out works. I no longer worry about this stuff.
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Old 23-05-2018, 13:25   #152
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Re: Rule Bilge Pump Float Switch Problems

Just finished a DIY float switch that I have big hopes for. I use a cheap Stainless Float Switch and a 12V automotive Relay. I have also added a couple of Flyback diodes to hopefully reduce arcing and prolong contact wear of both relay and float switches. $ are CAD
Parts:
1 x float switch ($4 for 3 inc epacket shipping aliexpress)
1 x relay ($10 for 5 inc epacket shipping aliexpress)
1 x 1 1/2" PVC pipe end stop ($3.50)
1 x 1 1/2" PVC pipe fitting for removable end stop ($1.60)
1 x 1 1/2" PVC pipe screw in End stop ($1.60)
1 x 1 1/2" PVC pipe Union ($1)
1 x cable gland
6" 1 1/2" Pipe
PVC adhesive
1 x scrap piece of PVC cut into a circle same diameter as inside diameter of pipe.
Last picture shows it strapped to a pump for testing but I want to make a proper bracket, maybe fixing it to boat rather than pump. \

I can add a circuit diagram if anyone is interested. All in I spent around $12 on this but already had some of the parts.
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Old 23-05-2018, 13:28   #153
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Re: Rule Bilge Pump Float Switch Problems

Yeah I know I should clean the crap out of my bilge!
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Old 23-05-2018, 15:23   #154
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Re: Rule Bilge Pump Float Switch Problems

Build Notes:

1. I used a hole saw to cut a disc of pvc (G) and then enlarged the hole to take the threaded part of the float switch.
2. Glue disc upto the flat in one half of the Coupler (A)
3. Glue E into the same side of the Coupler (A) that you fitted the disc.
4. Glue (I) onto the other end of (E)
5 Drill a hole into the top (square) of (C) for the Cable gland (J). I couldn't get the cable gland nut to fit so glued the gland (J) into (C).
6. Drill 1/8 inch holes all round bottom of (B)
7. Insert H into Coupler (A) (the empty side of course)
8. Drill 4 holes 1/16" in (H) just below the top of (H) when it is fitted in (A) (this is to allow air to escape as water enters holes in (B))
9. Part (H) is cut to length later to give you your switch on/off height
10 Part (B) pushes onto the other end of (H) (only so far that holes in B are still open for water to enter).

Joints (H) to (A) and (H) to (B) are not glued to allow adjustment/cleaning
Joints (G) to (A), (E) to (A), (I) to (E) should all be watertight joints.
I put a circular piece of foam inside (H) to keep the relay from sitting on float switch wires.

The relay once wired slides nicely into (H), the 3 wires are threaded through the gland (not tightened yet), then (C) is screwed into (I) and finally gland is tightened. I put shrink wrap over end of gland (J) as it wasn't possible to seal round the wires using the gland nut.
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Old 25-06-2018, 12:01   #155
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Re: Rule Bilge Pump Float Switch Problems

I updated the circuit to add some delay to switch off, works great now.
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