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Tool Talk Discussion Forum

Is there a way to use a pressure switch on a pump

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unioncreek

08-02-2006 07:34:57




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I pump out of an old cistern to irrigate my lawn and it will only supply enough water for about two hours. Is there a way I can rig a pressure switch so that when it runs out of water and the pressure drops that it will shut it off so the pump doesn't burn up? If this will not work what can I use?

Thanks,

Bobg




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Bus Driver

08-02-2006 10:07:28




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 Re: Is there a way to use a pressure switch on a p in reply to unioncreek, 08-02-2006 07:34:57  
If the pressure at the pump is more than 10 PSI, such a switch exists. SquareD makes them. Model 9013FSG-2J21M4 is one of that type. Grainger sells it as catalog number 2FH06. The switch shuts off if pressure drops below 10PSI and must be restarted by hand in such instances.



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Glen,2

08-02-2006 09:12:12




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 Re: Is there a way to use a pressure switch on a p in reply to unioncreek, 08-02-2006 07:34:57  
I have a pressure switch on my well pump that works both ways. When the pressure reaches the setting it will shut the pump down, also when the press gets too low it will shut the pump down. These are available at any pump shop.



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Tool Junkie

08-02-2006 08:37:55




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 Re: Is there a way to use a pressure switch on a p in reply to unioncreek, 08-02-2006 07:34:57  
What about a cheap float controlled sump pump?

I've seen them for less than 50 bucks at Depot, plus you would have it for other things.

Mel



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Bob

08-02-2006 08:00:29




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 Re: Is there a way to use a pressure switch on a p in reply to unioncreek, 08-02-2006 07:34:57  
If the sprinkler is enough restriction to build decent pressure, you could rig up a pressure switch to a relay, so that when the pressure drops, and the pressure switch closes a relay will be activated. Have the pump connected to the relay's NC contacts so that when the relay pulls in, power to the pump will be cut.

You would need some type of momentary switch to provide a current path AROUND the relay to get the pump started, and pressure built up, at which point the pump will continue to run with the momentary switch is released, until it gain runs out of water, and the pressure again drops.

OR, you could hang a "pump down" float switch for a sump pump in the cistern, at a level where it would shut the pump "off", before it ran out of water.

One example of a "pump down" float switch can be seen as the second item at the link below:

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John T

08-02-2006 07:56:06




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 Re: Is there a way to use a pressure switch on a p in reply to unioncreek, 08-02-2006 07:34:57  
Bob, There certainly is and most plumbing shops or home supply or hardware stores ought to have them. Its kinda like the regular water well pressure switch BUTTTTT it has the extra auto shut off feature for low or no pressure. They usually have the extra lil flapper on the side one depresses n holds down to allow contact closure until the pressure rises, afterwhich it can be released. Then if the pressure drops below the set limit the contactor drops out so the pump quits n dont burn up until shes re set manually. They are usually found right next to the cheaper pressure switches and are a tad more expensive but certainly worth it to save a burned up pump.

John T (A water well user over 35 years)

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unioncreek

08-02-2006 14:21:44




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 Re: Is there a way to use a pressure switch on a p in reply to John T, 08-02-2006 07:56:06  
John,

Just what I'm looking for. Thanks.



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T_Bone

08-02-2006 22:35:39




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 Re: Is there a way to use a pressure switch on a p in reply to unioncreek, 08-02-2006 14:21:44  
Hi Unioncreek,

Here's a listing for SquareD FSG2M42040, 20/40psi, $23 or it comes in 30/50psi for the same price. Both are manual reset.

I bought several pump switchs from this company this summer with good results and his prices were reasonable. I only bought once from him so take it with a grain of salt.

T_Bone

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IH2444

08-02-2006 09:13:26




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 Re: Is there a way to use a pressure switch on a p in reply to John T, 08-02-2006 07:56:06  
Yes John, I have used them work fine. You just have to hold the lever down till the pressure gets above minimum pressure once they shut off for low pressure. Great little gadgets.



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