Cheap dry-run protection for jet pump

Discussion in 'Irrigation' started by CrazyJ, Jul 22, 2008.

  1. CrazyJ

    CrazyJ LawnSite Member
    from Raleigh
    Posts: 17

    I have the following pump setup with 6-8 ft suction and 4-5 feet head. Water comes from a 300 underground tank.

    http://www.harborfreightusa.com/usa...o?itemid=47906&CategoryName=&SubCategoryName=

    This has worked great for manually watering over the past year. When the water runs out I just flip the off switch. It'll run "dry" for 30 secs or so, but has water from the head so it's not totally dry. It has never triggered the thermal protection.

    I'd like to try something automatic. For this I figure I need dry run protection. I've looked around for types of pressure and float switches, but can't find anything cheap for this. The thermal protection is "auto-reset" which I figured would just make the pump come on again once it cooled down, which is undesirable. Any ideas to make this work, cheaply?
     
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,361

    Buy a pressure switch with a low-pressure cutoff.
     

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