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- Newsgroups: sci.aquaria
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- From: ghosh <SASAXG@mvs.sas.com>
- Subject: Re: Float switch for sump pump
- Sender: MVS NNTP News Reader <NNMVS@mvs.sas.com>
- Message-ID: <19921120083742SASAXG@mvs.sas.com>
- Date: Fri, 20 Nov 1992 13:37:00 GMT
- References: <1992Nov9.222001.28262@cs.wisc.edu>
- Nntp-Posting-Host: sdcmvs.mvs.sas.com
- Organization: SAS Institute Inc.
- Lines: 50
-
- >Newsgroups: sci.aquaria,rec.aquaria,alt.aquaria
- >Path: mozart.unx.sas.com!sas!concert!gatech!swrinde!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!uwm.edu!daffy!uwvax!ssec.wisc.edu!rader
- >From: rader@ssec.wisc.edu (Steve Rader)
- >Subject: Re: Float switch for sump pump
- >Message-ID: <1992Nov9.222001.28262@cs.wisc.edu>
- >Sender: news@cs.wisc.edu (The News)
- >Organization: University of Wisconsin, Space Science and Engineering Center
- >References: <1992Nov3.072949.3924@wvnvms.wvnet.edu> <1992Nov4.161045.17300@athena.mit.edu>
- >Date: Mon, 9 Nov 1992 22:20:01 GMT
- >Lines: 33
- >
- >mar@athena.mit.edu (Mark A. Rosenstein) writes:
- >|> I've made two different kinds of float switches. The first only cost me
- >|> a couple of dollars, but wasn't especially reliable and called for a part
- >|> from Radio Shack that has been discontinued (a mercury tilt switch).
- >|>
- >|> The ones I use now use a float switch from W.W.Grainger (an industrial
- >|> supplier with offices in most cities) which costs $12. They have one small
- >|> float switch which is safe for acidic environments, and seems to stand up
- >|> to salt water fine. I use a random aquarium airline suction cup to hold it
- >|> to the side of the sump. Then I buy one of those extension cord things that
- >|> has a 120V plug & socket at one end, and a remote switch at the other. Cut
- >|> the switch off the cord and connect it to the leads from the float switch.
- >|> The float switch now turns an electric outlet on & off!
- >
- >I'm glad this works for 'ya, but if I recall correctly, Grainger's does *not*
- >offer a 120V rated plastic float switch. I suspect you're using a 12V rated
- >float switch to switch 120V circuit. I'm not sure what the consequences may
- >be of using a 12V switch for a 120V circuit... I think you'll at least shorten
- >the switch's life-time and perhaps even harm your pump. (I do know when I
- >asked some EE geeks around here 'bout using a 12V switch, they definitely
- >told me to use a relay to actually switch the pump.) Even with cheap
- >powerheads, IHMO it's prudent to use a properly rated switch or else wire in a
- >appropiate relay.
- >
- >Steve
- >
- >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- >Steve Rader rader@ssec.wisc.edu
- >Sys Admin
- >Space Sci & Engineering Center Ain't nothing in the world
- >University of Wisconsin, Madison like a green skinned girl
- > Omnibus, takes all of us
- >~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- >
- I just bought one yesterday from Graingers. It is rated for upto 240 V
- plastic float switch for $10.50. This will work fine as a float switch
- My thanks to Mark for giving the tip.
-
- ghosh
-