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Pump Run-dry Cuttoff

Posted by misnbob (My Page) on
Wed, Jun 22, 11 at 5:32

I have a pump that feeds water from an underground vault. Near the bottom of the vault, there is a float valve auto-fill. The valve has failed to drop a couple of times, which has resulted in the pump running dry.

I'd like to find either a controller or a circuit I can put together that allows the pump to run from the existing timer, yet be disconnected via a relay if the flow output from the pump is low/zero. The main problem is that the pump needs to prime for 20-30 seconds in some cases, so I really need the flow switch to not trip the relay until the first 30 seconds of energized time has passed.

Any ideas?


Follow-Up Postings:

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RE: Pump Run-dry Cuttoff

An SVRS capable pump or an SVRS system that knows how to shut the system off should fit nicely here.

Scott


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RE: Pump Run-dry Cuttoff

I had never heard of SVRS so I did some googling and still can't see how an SVRS would help. What does the device use as a trigger? Flow loss or pressure loss?


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RE: Pump Run-dry Cuttoff

The Intelliflow SVRS senses it can't prime or loses prime. I believe that Hayward's also does this.

Scott


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