Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 08-04-2014, 18:38   #16
Senior Cruiser
hpeer's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: Philadelphia
Boat: Murray 33-Chouette & Pape Steelmaid-44-Safara-both steel cutters
Posts: 4,183
Re: Water Witch Bilge Switch

I've got a really weird sump. It is 3 inch diameter PVC pipe buried 3 feet down in the concrete of my keel. Steel boat. The PO never had a electric pump or float, just stuck some hose down the pipe and pumped it out.

I want some kind of switch I can put down the pipe along with the pickup tube, run to a diaphragm pump. Think Whale Gulper.

The problem is finding a switch small enough to coexist with the pick up tube down the hole.

A Water Witch turned sideways is about as small as I can find.

The alternative is possibly a Jabsco Hydro Air switch, if I cut off the mounting ears on the air bell.

Any sage rods of advice on mini sized switches?

Also found this...

hpeer is offline   Reply With Quote
Old 08-04-2014, 20:47   #17

Cruisers Forum Supporter

Join Date: Apr 2006
Posts: 13,755
Re: Water Witch Bilge Switch

"The problem is finding a switch small enough to coexist with the pick up tube down the hole"
No big deal. Take a look at toilet float valves in any hardware store. The old kind used a big hollow ball on a lever arm. The new kind, which is what you want to look at, use a "donut" that floats up around the fill pipe.
You want to start with that, or copy it. Buy some high strength neodymium disc magnets, epoxy them to the float collar. Now place a glass encapsulated reed switch in the pipe, so that when the float donut comes up, the magnets trip the reed switch, and you use that to turn on the pump.
For redundancy you can fit several reed switches in parallel so that as the donut floats up, it trips several of them all the time, not just one.

Magnetic reed switches are used in common alarm contacts on windows or sold in electronic supplies. They're fairly waterproof (like light bulbs, the glass is sealed) but you would want to go over the wires that exit them with epoxy or other sealant to make that 100% waterproof.

A couple of bucks and a couple of easy hours of your time, and you can fit that switch into anything, with multiple redundancy.

hellosailor is offline   Reply With Quote

water, bilge

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Battery in the Bilge and Exhaust Outlet troppo Electrical: Batteries, Generators & Solar 17 12-11-2013 03:26
Cleaning Poly Water Tank LifesAnAdventure Plumbing Systems and Fixtures 9 17-02-2013 17:03
Bilge Water and Encapsulated Keel anjolain Monohull Sailboats 32 01-12-2012 08:58
Which Bilge Pump Switch Do You Like ? over40pirate Plumbing Systems and Fixtures 33 12-04-2012 16:01
Bilge Float Switch JusDreaming Product or Service Reviews & Evaluations 10 15-02-2012 11:41

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:03.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.